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  • 115 best tree puns and tree jokes for leafy laughs – Growing Family

    115 best tree puns and tree jokes for leafy laughs – Growing Family

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    If you’re looking for tree jokes, tree puns, and tree proverbs, you’re in the right place.

    I’ve rounded up a bumper list of over one hundred tree jokes and puns about trees to get you giggling.  They make really good tree captions for your nature photos on social media (check out my nature hashtags and tree quotes posts for those too), and you can also use them in school projects, greetings cards and texts.  Or you could just have fun reading them!

    sunlight through tree branches

    Fantastic tree facts

    Trees are amazing.  Before we get started on the jokes, here are some fantastic facts about trees.

    • Trees have been around on Earth for at least 370 million years.
    • Trees provide food, shelter, fuel and building materials.
    • Some types of tree can live for thousands of years.
    • Trees act like the lungs of our planet, turning carbon dioxide into oxygen.
    • Trees work together to ward off predators.  They release chemical signals to deter pests, warn other trees about a threat, and attract predators that feed on the pests.
    • There are 422 times more trees on earth than there are people.
    • Trees can communicate with each other via an underground network of soil fungi – they can even send nutrients, water and unused carbon to each other!
    • Leaves are lots of colours, including red, yellow, purple and orange, not just green.  Chlorophyll makes leaves green and dominates until they get less sunshine, when the other colours start to take over.
    • There are over 60,000 species of trees on our planet.
    • Trees release chemicals called phytoncides, and research has shown that breathing these in can reduce blood pressure, lower anxiety levels and make us feel happier.  It’s no wonder forest bathing is becoming increasingly popular, is it?

    This short video explains forest bathing in more detail.

    The best tree puns and tree jokes

    So now we know just how incredible trees are, it’s time to appreciate them for their ability to give us a good laugh.

    Read on for a whole host (or should that be forest?!) of family-friendly jokes on trees and tree puns.  I’ve also included some great tree proverbs, which are perfect if you’d like something a little more meaningful that gets you thinking.

    You can also check out my list of fall puns which has lots of tree-themed gags and leaf puns.

    cherry blossom on a tree against blue skycherry blossom on a tree against blue sky

    Funny tree jokes

    Put a smile on your face with these funny – and sometimes rather silly – tree jokes.

    How do trees access the internet?  They log in.

    What did the tree wear to the pool party?  Swimming trunks.

    Which side of a tree has the most leaves?  The outside.

    What is every tree’s favourite shape?  A tree-angle.

    Why do trees hate riddles?  Because they don’t like being stumped.

    What type of tree fits into your hand?  A palm tree.

    Why are leaves always taking risks?  Because they constantly have to go out on a limb.

    What did the tree say to the lumberjack?  Leaf me alone!

    person sitting on a bench under a tree in sunshineperson sitting on a bench under a tree in sunshine

    How did the tree get lost?  It took the wrong root.

    Why are trees some of the best networkers?  Because they’re always branching out.

    What type of fish falls from trees?  Jel-leaf-ish. (more fish puns here)

    Why did the tree fail maths?  Because it couldn’t do square roots.

    How do trees make themselves heard?  Amp-leaf-ication.

    What’s the same size and shape as a giant eucalyptus tree, but weighs nothing?  It’s shadow.

    What’s a tree’s favourite drink?  Root beer.

    Which dating app do trees use?  Timber.

    magnolia tree flowersmagnolia tree flowers

    Why were lots of people sitting under the tree?  It was poplar.

    Where do woodlice go on holiday?  To the beech.

    What did the Jedi say to the sacred tree?  May the forest be with you.

    How do you get down from a tree?  You don’t – down comes from a duck.

    What kind of stories do giant sequoia trees tell?  Tall tales.

    Why shouldn’t you invite a tree to a party?  Because they never leaf.

    What did the beaver say to the tree?  It’s been nice gnawing you.

    Why don’t you ever see elephants hiding in trees?  Because they’re so good at it.

    fir trees in a forestfir trees in a forest

    What do you call an oak tree that can’t make it’s mind up?  Undeciduous.

    Did you know I can cut down a tree just by looking at it?  It’s true. I saw it with my own eyes.

    What gets a year older every time it rings?  A tree.

    Why do dogwood trees make good pets?  Because they have a great bark, but wooden bite.

    What happens when a tree falls into mud?  It leafs an impression.

    Why did the tree get into trouble?  Because it was being knotty.

    What looks like half a tree?  The other half.

    How do trees get in touch with each other.  By teleafone.

    red acer tree leavesred acer tree leaves

    What’s a tree’s least favourite month?  Sep-timber.

    Which tree likes high fives?  A palm tree.

    What do trees do on Valentine’s Day?  They get sappy.

    Which school subject do trees like best?  Geome-tree.

    What sound does a tree make?  It barks.

    What’s a tree’s favourite dinosaur?  The Tree-Rex.

    How many oranges grow on a tree?  All of them.

    What radio stations do trees like?  Ones that play poplar songs.

    tree lined path in autumn with fallen leavestree lined path in autumn with fallen leaves

    Where do saplings go to learn?  Elemen-tree school.

    What’s the saddest tree?  The weeping willow.

    Why did the tree need to take a nap?  For rest.

    What do trees wear when it gets cold?  Fir coats.

    What’s the best way to make a tree laugh?  Tell it acorn-y joke.

    What did the tree like best about Star Trek?  The Captain’s log.

    Would you like a quick explanation of an acorn?  In a nutshell, it’s an oak tree.

    Why was the tree stumped?  Because it couldn’t get to the root of the problem.

    closeup of fir tree branchescloseup of fir tree branches

    Christmas tree puns

    Looking for jokes about trees with a festive theme?  Here are my favourite Christmas tree jokes – perhaps you could use them to make your Christmas card messages holly jolly?

    Why are Christmas trees bad at sewing?  They always drop their needles.

    How do Christmas trees get ready for a night out?  They spruce up.

    What happens when Christmas trees go numb?  They get pines and needles.

    Who is a pine tree’s favourite singer?  Spruce Springsteen.

    What do you get if you cross a Christmas tree with an iPad?  A pineapple.

    Why was there ice cream under the Christmas tree?  To go with the pine cones.

    How do you turn a Christmas tree into a reindeer?  Decorate it with horn-aments.

    Why are Christmas trees so fond of the past?  Because the present’s beneath them.

    What do Christmas trees get when they’re ill?  Tinselitis.

    What’s another name for an artificial Christmas tree?  A faux fir.

    tree leaves against skytree leaves against sky

    Short tree puns & forest puns

    Take it or leaf it

    Good things come in trees

    Deja-yew

    I’m rooting for you

    Wooden you think?

    I don’t be-leaf it

    The silent tree-tment

    What a treet

    cherry blossom on treecherry blossom on tree

    A pine line

    In grove danger

    Call the copse

    It’s very in-tree-guing

    A quick re-treet

    Best fronds

    All very over-elming

    That’s leaf

    tree and bench by a laketree and bench by a lake

    The best I conifer

    That’s tree-mendous

    Take the short root

    Bough to pressure

    Tie the knot

    It’s very poplar

    Pine in the neck

    Good chemis-tree

    What a re-leaf

    acer japanese maple with red and gold leavesacer japanese maple with red and gold leaves

    Tree for all

    The third book in the tree-logy

    Buy one, get one tree

    It’s a mys-tree

    Feeling pine

    Oakay

    Barking up the wrong tree

    Can’t see the wood for the trees

    Get to the root of the problem

    tree canopy from belowtree canopy from below

    Going out on a limb

    Knock on wood

    Conker the opposition

    Fir sure

    Sleep like a log

    Turn over a new leaf

    Neck of the woods

    Hard to tree-sist

    Axe, and you shall receive

    A final few silly tree jokes

    How do you identify a dogwood tree? By the bark.

    What was wrong with the wooden car with wooden wheels? It wooden go.

    What type of films do trees like most? A sappy movie.

    Which Canadian city is popular with trees? Montree-al.

    What did the tree do when the bank closed? It started its own branch.

    Why do trees make great thieves? Because they have sticky fingers.

    What do you get when you cross a cat with a lemon tree? A sour puss.

    “Would you ever try the acorn diet?” “No way, it sounds nuts!”

    What do you call an island with dozens of pear trees? Pear-adise.

    What did the little pine tree say to the big pine tree? “Leaf me alone!”

    What do you get hanging from apple trees? Sore arms.

    What did the elm tree say after making an offer? “Take it or leaf it.”

    Why can’t the lonely evergreen stop thinking about high school? Because he’s still pining to be one of the poplar kids.

    What type of evergreen tree can change a light bulb? A palm tree.

    These tree puns may have made you groan, but admit it – you still smiled!

    large tree in countrysidelarge tree in countryside

    Tree proverbs & tree sayings

    Proverbs are always brilliant pause for thought, and a nice starting point for a conversation.  There are lots of tree sayings out there, here are twenty of my favourites.

    The best trees grow on the steepest hills. – Burundi proverb

    The tree of silence bears the fruits of peace. – Arabian proverb

    Mighty oaks from little acorns grow. – English proverb

    Men will only throw stones at trees that are laden with fruit. – French proverb

    A society grows great when old men plant trees whose shade they know they shall never sit in. – Greek proverb

    A seed hidden in the heart of an apple is an orchard invisible. – Welsh proverb

    Little strokes fell great oaks. – American proverb

    The taller the tree, the harder the fall. – Dutch proverb

    When eating the fruit, think of the person who planted the tree. – Vietnamese proverb

    If a dead tree falls, it carries with it a live one. – Kenyan proverb

    birch trees in woodlandbirch trees in woodland

    Even the best tree sometimes has bad fruit. – Hungarian proverb

    Don’t climb a tree to catch a fish. – Chinese proverb

    An apple never falls far from the tree. – English proverb

    The firm tree does not fear the storm. – Indonesian proverb

    Though a tree grows ever so high, the falling leaves return to its roots. – Malawian proverb

    In a tree that you can’t climb, there are always a thousand fruits. – Indian proverb

    The one who plants the tree is not the one who will enjoy its shade. – Chinese proverb

    Big trees cast more shadow than fruit. – German proverb

    If you want to be happy for a year, plant a garden; if you want to be happy for life, plant a tree. – English proverb

    The best time to plant a tree was 20 years ago.  The next best time is now. – Chinese proverb

    bluebells in woodlandbluebells in woodland

    Is your favourite tree pun on this list?

    I hope these tree jokes, tree puns and tree proverbs have made you smile and created a whole forest of laughter 😉

    More funny jokes and puns

    For more jokes and puns on a nature theme, you might like to take a look at these posts:

    Nature puns and nature jokes

    Garden jokes and garden puns

    Flower jokes and flower puns

    Plant puns and plant jokes

    Garden gnome puns

    Ice puns and water puns

    The best bee jokes and bee puns

    Sunflower puns and sunflower jokes

    Puns about birds and bird jokes

    Cat puns and cat jokes

    Fruit puns and fruit jokes

    Vegetable puns and vegetable jokes

    Bean jokes and puns

    Potato puns and potato jokes

    Pumpkin jokes and pumpkin puns and skull puns (these are particularly good around Halloween, and my Halloween jokes for kids are worth a look too)

    Spring puns and spring jokes and Easter jokes for kids

    Summer jokes for kids

    Winter jokes for kids

    Christmas jokes for kids and clever Christmas puns

    Art jokes and puns

    You might also like my posts on nature quotes and nature captions, earth day quotes, flower quotes, garden quotes, quotes about sunflowers and waterfall quotes.

    book covers for A Year of Nature Walks and Games and A Year of Nature Craft and Play by Catherine Hughes and Becky Goddard-Hillbook covers for A Year of Nature Walks and Games and A Year of Nature Craft and Play by Catherine Hughes and Becky Goddard-Hill

    More inspiration for nature lovers

    If you love exploring nature and would like some more inspiration, my books *‘A Year of Nature Craft & Play’ and *A Year of Nature Walks & Games are packed with fun nature play activities, games and crafts for kids.

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    A bumper list of over 100 tree puns and tree jokes to make you smile, plus inspiring tree proverbs. Perfect captions for your nature pictures!A bumper list of over 100 tree puns and tree jokes to make you smile, plus inspiring tree proverbs. Perfect captions for your nature pictures!

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    Catherine

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  • Local lens, global impact: Mini park tackles big climate worries

    Local lens, global impact: Mini park tackles big climate worries

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    Newswise — Palm Springs Downtown Park is an inviting 1.5-acre urban oasis for residents and visitors to Palm Springs, a design-forward desert destination nestled along the base of the San Jacinto Mountains along the southwestern boundary of the Coachella Valley in California’s Sonoran Desert of the USA. The site lies in the ancestral homeland of the Agua Caliente band of the Cahuilla people who seasonally migrated between the shady palm groves and meltwater creeks of mountain canyons in summer and the hot springs and temperate climate of the valley floor in winter. The park is also located on the historic site of the Desert Inn, Palm Springs’ first wellness resort. Nellie Coffman, the Desert Inn’s founder, famously promoted the “space, stillness, solitude, and simplicity” of Palm Springs, and the park is imbued with her spirit. Drawing inspiration from local natural features such as the oases of endemic California fan palms (Washingtonia filifera) in Palm Canyon and the striated geology of nearby Tahquitz Canyon, the park design creates hospitable, comfortable spaces for the community in the extreme heat of the desert. The park features dense palm grove planting with ample shaded areas for seating, two picnicking and event lawns, rock outcrop-like amphitheater seating for community events, shade structures inspired by palm fronds, and a grotto-like interactive water feature for play and cooling. Locally sourced stone, native desert plantings, and creature comforts create a common ground rooted in a hyperlocal use of materials to create a sense of place for the diverse, growing community of Palm Springs and its visitors

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    Frontiers

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  • Science Is the Best (Local, Regional, National, Global) Policy

    Science Is the Best (Local, Regional, National, Global) Policy

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    About a decade ago, BRI hosted a Bio Blitz at our River Point bird monitoring station in Falmouth, Maine.

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    Biodiversity Research Institute (BRI)

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  • “Energy Droughts” in Wind and Solar Can Last Nearly a Week, Research Shows

    “Energy Droughts” in Wind and Solar Can Last Nearly a Week, Research Shows

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    Newswise — Solar and wind power may be free, renewable fuels, but they also depend on natural processes that humans cannot control. It’s one thing to acknowledge the risks that come with renewable energy: the sun doesn’t always shine and the wind doesn’t always blow, but what happens when the grid loses both of these energy sources at the same time?

    This phenomenon is known as a compound energy drought. In a new paper, researchers at Pacific Northwest National Laboratory (PNNL) found that in some parts of the country, these energy droughts can last nearly a week.

    “When we have a completely decarbonized grid and depend heavily on solar and wind, energy droughts could have huge amounts of impact on the grid,” said Cameron Bracken, an Earth scientist at PNNL and lead author on the paper. Grid operators need to know when energy droughts will occur so they can prepare to pull energy from different sources. On top of that, understanding where, when, and for how long energy droughts occur will help experts manage grid-level battery systems that can store enough electricity to deploy during times when energy is needed most.

    The team published the findings October 31 in the journal Renewable Energy and will be presenting at this week’s annual meeting of the American Geophysical Union.

    Hunting for cloudy, windless days

    In the past, researchers studied compound energy droughts on a state or regional scale. But not much has been studied on a nationwide scale. To find out more about the risk of energy droughts over the entire continental U.S., the researchers dug into weather data and then used historical energy demand data to understand how often an energy drought occurs when that energy is needed the most.

    The team examined 4 decades of hourly weather data for the continental U.S. and homed in on geographical areas where actual solar and wind energy plants operate today. Weather data included wind speeds at the height of wind turbines as well as the intensity of solar energy falling on solar panels. Times when the weather data showed stagnant air and cloudy skies translated into lower energy generation from the wind and solar plants—a compound energy drought.

    “We essentially took a snapshot of the infrastructure as of 2020 and ran it through the 40 years of weather data, starting in 1980,” Bracken said. “We are basically saying ‘here is how the current infrastructure would have performed under historical weather conditions.’”

    The researchers found that energy droughts can occur in any season across the continental U.S., though they vary widely in frequency and duration. In California, for instance, cloudy and windless conditions might last several days, whereas the same conditions might last for only a few hours in Texas. Utah, Colorado, and Kansas experience frequent energy droughts both over several-hour timescales as well as several-day timescales. The Pacific Northwest and Northeast, meanwhile, seem to experience energy droughts that last several hours more frequently than several days. The different timescales (hourly versus daily) will help inform the energy drought’s impact on the grid—will it last just a few hours, or several days?

    Overall, researchers found that the longest potential compound energy drought on an hourly timescale was 37 hours (in Texas), while the longest energy drought on a daily timescale was six days (in California).

    Energy drought at peak demand

    Simply knowing the where and how of energy droughts is just one piece of the puzzle, Bracken said. He also stressed that a drought of solar and wind power won’t necessarily cause an energy shortage. Grid operators can turn to other sources of energy like hydropower, fossil fuels, or energy transmitted from other regions in the U.S.

    But as the nation aims to move away from fossil fuels and rely more on solar and wind power, grid operators must understand whether energy droughts will occur during times when the demand for electricity might exceed supply. Climate change brings hotter summers and more intense winter storms, and these are times when not only people use more energy to stay safe (for cooling or heating), but access to electricity might mean life or death.

    To understand the possible connection between energy droughts and energy demand, the team mapped their historical, hypothetical generation data onto 40 years of historical energy demand data that also covered real power plants across the continent.

    The data showed that “wind and solar droughts happen during peak demand events more than you would expect due to chance,” Bracken said, meaning that more often than not, windless and cloudless periods occurred during times when demand for power was high. For now, Bracken isn’t certain that the correlation means causation.

    “This could be due to well-understood meteorological phenomenon such as inversions suppressing wind and increasing temperatures, but further study is needed,” Bracken said.

    Energy storage for energy droughts

    Studying patterns in the frequency and duration of energy droughts will also help inform the deployment of long-duration energy storage projects, said Nathalie Voisin, an Earth scientist at PNNL and coauthor on the paper. The paper is the first to provide a uniform standard of what a compound energy drought is and how long it can last in different parts of the country.

    “We’re providing insight on how to adequately design and manage multi-day storage. So when you know an energy drought is going to last for five hours or five days, you can incentivize storage to be managed accordingly,” Voisin said.

    Next, Bracken and the team will extrapolate weather and demand data into the future to see how climate change will affect the frequency and duration of energy droughts. The team plans to model energy droughts all the way to the end of the century combined with evolving infrastructure.

    This research was funded by PNNL through its internal GODEEEP initiative.

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    Pacific Northwest National Laboratory

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  • The Best of Reason: The Endangered Species Act at 50

    The Best of Reason: The Endangered Species Act at 50

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    This week’s featured article is “The Endangered Species Act at 50” by Tate Watkins.

    This audio was generated using AI trained on the voice of Katherine Mangu-Ward.

    Music credits: “Deep in Thought” by CTRL and “Sunsettling” by Man with Roses

    The post <I>The Best of Reason</I>: The Endangered Species Act at 50 appeared first on Reason.com.

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    Tate Watkins

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  • Opinion: California’s majestic desert must be preserved. This proposal can help

    Opinion: California’s majestic desert must be preserved. This proposal can help

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    As the former superintendent of Joshua Tree National Park — and a 38-year career employee for the National Park Service — I have seen the undeniable benefits that come with conserving our public lands. Nowhere has this become more clear than in the California desert, where conservation efforts have nurtured a growing and sustainable outdoor recreation community and economy. A new proposal to establish the Chuckwalla National Monument and protect public lands adjacent to Joshua Tree National Park is the next step in continuing these endeavors.

    Proposed by Rep. Raul Ruiz (D-Palm Desert), the Chuckwalla National Monument and Joshua Tree National Park extension would encompass roughly 660,000 acres of public land in the California desert. The designation would help ensure more equitable access to nature for residents of the Eastern Coachella Valley, Blythe and other local communities. Already, these lands are beloved for outdoor activities such as hiking, picnicking, stargazing and recreational off-highway vehicle use. Elsewhere in the California desert, public lands conservation that supports similar activities has led to visitor spending that directly benefits the economies of nearby communities.

    The proposed monument would also help safeguard the ecologically rich but vulnerable Colorado Desert bioregion. Conserving this area will protect important wildlife and plant habitats, including those necessary to support the desert tortoise, desert bighorn sheep and the Mecca aster, among others. The monument would also conserve critical wildlife corridors between Joshua Tree National Park and other protected areas such as the Palen/McCoy Wilderness. Additionally, the region’s undisturbed desert lands are increasingly valued for their important role in sequestering atmospheric carbon, a key contributor to global climate change.

    The lands proposed for protection include the homelands of the Iviatim, Nüwü, Pipa Aha Macav, Kwatsáan and Maara’yam peoples (Cahuilla, Chemehuevi, Mojave, Quechan and Serrano nations). The proposed monument would preserve this cultural landscape by protecting important heritage values, sacred sites and objects, traditional cultural places, plants and wildlife.

    The timing for this effort could not be better, as support for public land conservation is steadily growing throughout the West in general. The 2023 Colorado College Conservation in the West Poll shows that more than 80% of voters across eight Western states support the “30×30” goal of protecting 30% of U.S. lands and waters by 2030. Additionally, the proposed national monument would help advance California’s own “30×30” goals.

    At a time when conserving nature and meeting renewable energy goals are critical, a Chuckwalla National Monument would accomplish both. It is complementary to the goals of the Desert Renewable Energy Conservation Plan, a multi-year collaborative process that identifies areas suitable for renewable energy development and lands important for conservation. The proposed monument avoids lands suitable for energy projects and it protects areas that are important to conserve for their biological, cultural and historic values.

    President Biden is on track to protect more land than any other first-term president in modern American history. To date, he has responded to calls to safeguard public lands near the Grand Canyon, in southern Nevada and elsewhere. Biden should continue this work and designate Chuckwalla National Monument and protect lands adjacent to Joshua Tree National Park, helping to preserve some of California’s desert treasures.

    Mark Butler is the former superintendent of Joshua Tree National Park and a 38-year career employee of the National Park Service.

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    Mark Butler

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  • AI discovers formula for anticipating giant waves.

    AI discovers formula for anticipating giant waves.

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    Newswise — Long considered myth, freakishly large rogue waves are very real and can split apart ships and even damage oil rigs. Using 700 years’ worth of wave data from more than a billion waves, scientists at the University of Copenhagen and University of Victoria have used artificial intelligence to find a formula for how to predict the occurrence of these maritime monsters. The new knowledge can make shipping safer.

    EMBARGOED CONTENT UNTIL MONDAY 20 NOVEMBER 2023 3 PM US EASTERN TIME
    Stories about monster waves, called rogue waves, have been the lore of sailors for centuries. But when a 26-metre-high rogue wave slammed into the Norwegian oil platform Draupner in 1995, digital instruments were there to capture and measure the North Sea monster. It was the first time that a rogue had been measured and provided scientific evidence that abnormal ocean waves really do exist.

    Since then, these extreme waves have been the subject of much study. And now, researchers from the University of Copenhagens Niels Bohr Institute have used AI methods to discover a mathematical model that provides a recipe for how – and not least when – rogue waves can occur.

    With the help of enormous amounts of big data about ocean movements, researchers can predict the likelihood of being struck by a monster wave at sea at any given time.

    “Basically, it is just very bad luck when one of these giant waves hits. They are caused by a combination of many factors that, until now, have not been combined into a single risk estimate. In the study, we mapped the causal variables that create rogue waves and used artificial intelligence to gather them in a model which can calculate the probability of rogue wave formation,” says Dion Häfner.

    Häfner is a former PhD student at the Niels Bohr Institute and first author of the scientific study, which has just been published in the prestigious journal Proceedings of the National Academy of Sciences (PNAS). 

    Rogue waves happen every day

    In their model, the researchers combined available data on ocean movements and the sea state, as well as water depths and bathymetric information. Most importantly, wave data was collected from buoys in 158 different locations around US coasts and overseas territories that collect data 24 hours a day. When combined, this data – from more than a billion waves – contains 700 years’ worth of wave height and sea state information.

    The researchers analyzed the many types of data to find the causes of rogue waves, defined as being waves that are at least twice as high as the surrounding waves – including extreme rogue waves that can be over 20 meters high. With machine learning, they transformed it all into an algorithm that was then applied to their dataset.

    “Our analysis demonstrates that abnormal waves occur all the time. In fact, we registered 100,000 waves in our dataset that can be defined as rogue waves. This is equivalent around 1 monster wave occurring every day at any random location in the ocean. However, they arent all monster waves of extreme size,” explains Johannes Gemmrich, the studys second author.

    Artificial intelligence as a scientist

    In the study, the researchers were helped by artificial intelligence. They used several AI methods, including symbolic regression which gives an equation as output, rather than just returning a single prediction as traditional AI methods do.

    By examining more than 1 billion waves, the researchers’ algorithm has analyzed its own way into finding the causes of rogue waves and condensed it into equation that describes the recipe for a rogue wave. The AI learns the causality of the problem and communicates that causality to humans in the form of an equation that researchers can analyze and incorporate into their future research.

    “Over decades, Tycho Brahe collected astronomical observations from which Kepler, with lots of trial and error, was able to extract Kepler’s Laws. Dion used machines to do with waves what Kepler did with planets. For me, it is still shocking that something like this is possible,” says Markus Jochum.

    Phenomenon known since the 1700s

    The new study also breaks with the common perception of what causes rogue waves. Until now, it was believed that the most common cause of a rogue wave was when one wave briefly combined with another and stole its energy, causing one big wave to move on.

    However, the researchers establish that the most dominant factor in the materialization of these freak waves is what is known as “linear superposition”. The phenomenon, known about since the 1700s, occurs when two wave systems cross over each other and reinforce one another for a brief period of time.

    “If two wave systems meet at sea in a way that increases the chance to generate high crests followed by deep troughs, the risk of extremely large waves arises. This is knowledge that has been around for 300 years and which we are now supporting with data,” says Dion Häfner. 

    Safer shipping

    The researchers’ algorithm is good news for the shipping industry, which at any given time has roughly 50,000 cargo ships sailing around the planet. Indeed, with the help of the algorithm, it will be possible to predict when this “perfect” combination of factors is present to elevate the risk of a monster wave that could pose a danger for anyone at sea.

    “As shipping companies plan their routes well in advance, they can use our algorithm to get a risk assessment of whether there is a chance of encountering dangerous rogue waves along the way. Based on this, they can choose alternative routes,” says Dion Häfner.

    Both the algorithm and research are publicly available, as are the weather and wave data deployed by the researchers. Therefore, Dion Häfner says that interested parties, such as public authorities and weather services, can easily begin calculating the probability of rogue waves. And unlike many other models created using artificial intelligence, all of the intermediate calculations in the researchers’ algorithm are transparent.

    “AI and machine learning are typically black boxes that don’t increase human understanding. But in this study, Dion used AI methods to transform an enormous database of wave observations into a new equation for the probability of rogue waves, which can be easily understood by people and related to the laws of physics,” concludes Professor Markus Jochum, Dions thesis supervisor and co-author.

    Links:

    Read the scientific paper “Machine-Guided Discovery of a Real-World Rogue Wave Model” published in PNAS: https://www.pnas.org/cgi/doi/10.1073/pnas.2306275120

    Read the Wikipedia-list of registered rogue waves: https://en.wikipedia.org/wiki/List_of_rogue_waves

    Dion Häfner’s research continues at Pasteur Labs.

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    University of Copenhagen, Faculty of Science

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  • Growing Primroses the Guarantee Way

    Growing Primroses the Guarantee Way

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    The few requirements for primroses are easily met and are found in practically every garden. They do require shade throughout Mid-America, but this is always available on the north side of the house or in the shade of shrubs, evergreens, or trees. Primroses not only offer a variety of form, size, color, the habit of growth, but bloom (depending upon the variety) over a considerable period of time. Starting with the early Juliae hybrids such as ‘Wanda’ which blooms about pussy willow time, one continues through the mass of bloom of the polyanthus through to the double and triple decked flowers of the Japanese primroses in late May and even early June. Some of the less common helodoxa primroses may even bloom up into July. Not many other plants give such a long period of bloom.

    It’s easy to get started with primroses. Blooming size plants of the more common forms are available from many nurseries. From the Pacific Coast primrose specialists, you can buy flowering size plants of many different kinds. At certain times of the year they offer seedling primroses at very attractive prices. These young vigorous plants take hold quickly and give considerable bloom the following spring. Primroses may be grown from seeds. Although only the more common kinds such as Polyanthus are available from the average seed store, primrose specialists handle a wide range of species and varieties.

    Most primroses are very easy to grow from seeds. Contrary to the recommendations of some primrose specialists, there is no need of freezing the seeds before planting. As long as the temperatures are not up in the 80’s day and night, primrose seeds can be sown either outdoors or indoors. The greatest difficultly in raising primroses from seeds however, is sowing the seeds in the proper sort of seed bed.

    A mixture of equal parts sand and peat moss with the seeds covered 1/16 to 1/18 of an inch with this material seems to be ideal. Since there is no nourishment in this mixture, an inch layer of it can be put on top of a soil mixture made up of equal parts of soil, sand, and peat. Primrose seeds may be sown in early August, although if the temperatures are high it may pay to put the seed pans or flats in a cool cellar until the seeds germinate.

    The seeds may be sown in November for spring germination in the cold frame or can be sown any time during the fall in the greenhouse to be kept growing throughout the winter. Seeds may also be sown outdoors, preferably in a cold the sand and peat seed bed will give wonderful results. I personally have had equally good results sowing the seeds in a greenhouse in October, in the greenhouse in January, the cold frame in March and in early August.

    After the seedlings get their second or third leaves they can be transplanted. Again the soil mixture is very important. You will probably get better root growth if they are put in a bed or in flat rather than in individual pots. Make the soil of equal parts garden loam and peat. Mix a cup of any complete commercial fertilizer with each bushel of the soil mixture.

    The more common vigorous primroses such as Polyanthus can be planted three inches apart. The smaller ones can be put closer together. If, during the spring and early summer, you are planting the primrose seedlings in a cold frame, they should have a mixture of at least equal parts peat and soil and preferably three parts peat to one part soil. There should be a bed of this four to six inches deep for them to grow in. Again the fertilizer should be thoroughly mixed through the bed before planting.

    For many of you who are buying seedlings or growing your own seedlings, better results will be obtained in most gardens by growing them in a cold frame where they can be shaded with muslin (an old sheet) or by a lath shade. If they are kept thoroughly watered throughout the summer and fertilized every two to three weeks with a liquid fertilizer they will make an enormous amount of growth during the summer.

    The root systems will be at least the size of your fist and every bit of it will come out in the peaty mixture that you have them growing in. You will learn from experience as you try to grow some of the less common and more difficult primroses that you may have to keep a number of the species in a shaded cold frame rather than try to plant them in the garden itself.

    Primroses, with the exception of Florindae, helodoxa, Bulleyana, Beesiana, and japonica require a well drained soil. These we have just mentioned, however, will grow in a relatively wet soil. Florindae and japonica will thrive in a bog.

    Before planting any primroses in the garden proper the bed should be prepared by mixing the soil so it is at least half peat to a depth of at least eight inches. As with all other planting, a complete commercial fertilizer should be mixed with the soil.

    Primroses can be planted in early spring, in late spring after they have finished blooming when they are normally divided, or in the early fall. The more common primroses seem to be perfectly hardy and except for a light mulch to prevent heaving they do not require a great deal of winter protection.

    Primroses should be fertilized regularly. In the early spring before growth starts scatter a complete commercial fertilizer such as a 4-12-4 or something similar over the entire bed. Another application can be given in the early fall to stimulate a little fall growth before the ground freezes.

    The worst primrose pest and the one that probably kills more primroses than any other through the Midwest is the spider mite (red spider). Because primrose leaves are close to the ground, it is difficult to contact these mites with the average dust or spray. The use of natural products to control mites is recommended.

    Slugs are always around primroses because they grow in the shade. Either prepared slug bait sold under various trade names. They should be used at least once a month starting with April and continuing through the season until fall freezing. Sow bugs may be controlled by dusting or spraying with chlordane.

    Now we are confronted with the problem of knowing what primroses to grow. In the past the English were considered as having the best primroses. But today it is interesting to know that in England the florists using primroses for cut flowers are growing not their own hybrids but those of our own Pacific Coast primrose specialists. They are hybrid Polyanthus.

    There is no question but that the bulk of primroses in your garden will be Polyanthus. The range of color is from white to cream to yellow to orange to pink to red to purple to blue. The flowers are from one half inch in ordinary ones up to silver dollar size in the improved strains. They may be purchased as mixed plants or according to colors. The same is true of the seeds. There is nothing more showy in a spring garden than Polyanthus primroses. They are usually perfectly hardy and given the proper soil and other conditions they will multiply.

    Japanese primroses are seldom grown to the extent that they should be although they are just as easy to grow. They do not multiply as much as the Polyanthus, but their 18-24 inch spikes of white, pink, or red flowers are magnificent. If you have a wet poorly drained shaded spot in your yard they will thrive there. They are very fast growing from seeds.

    Somewhat similar to the Japanese primroses with more delicate colors are Bulleyana and Beesiana. They do not seem to be quite so hardy or as easy to grow as japonica.

    Auriculas are very different from their sister primroses. They have smooth leaves that look almost like small cabbage leaves. The flowers come in cream, pale yellow, lavender and purple. They are relatively easy to grow from seeds, but in many gardens will not be as permanent. Personally, I find that they winter better in the cold frame, then they can be put out into the beds in the spring where they can be seen and enjoyed.

    Primula denticulata has rather wide spreading leaves and a little compact head of lavender flowers in the early spring. It is a good grower and easy to grow. In the cooler climates, it may develop into sizable clumps. Others may find that they are not quite as permanent as the Polyanthus.

    by Gordon Milne

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    Frederick Leeth

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  • New species with “hieroglyphic” pattern discovered among sand dunes

    New species with “hieroglyphic” pattern discovered among sand dunes

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    A brand new lizard species with a hieroglyphic pattern on its back has been discovered among the sand dunes in eastern Iran.

    The discovery, which was detailed in a study in the journal Zootaxa on November 10, was made back in 2010 in the South Khorasan province of the desert, while researchers were conducting a survey for local reptiles and amphibians.

    The researchers found a total of 10 strange-looking lizards in the sand dunes, all with an unusual pattern on their skin. They discovered that it was actually an entirely new species, now named Eremias graphica, or the “hieroglyphic racerunner lizard.”

    The new species is named using the Greek word “graphikos,” according to the study, as reported by the Miami Herald. This translates to either “drawn” or “written,” and was used because of the lizard’s strange pattern which resembles hieroglyphs.

    A photo shows the new lizard species found in the sand dunes of Iran. A closer look at the creature shows a strange pattern on its back.
    Eskandar Rasegar-Pouyani, Valentina Orlova, Khosrow Rajabizadeh, Hossein Nabizadeh, Nikolay Poyarkov, Daniel Melnikov and Roman Nazarov

    Hieroglyphs are generally associated with Ancient Egypt, though other forms of writing also exited at the time.

    The researchers found that most of the lizards were about 7 inches long and were easily disguised in the sand dunes due to their sandy coloring, according to the study.

    The researchers, who are from multiple organizations from across Russia and Iran, analyzed 93 genetic samples from the lizards in the desert.

    “We hypothesize that the diversification of the Eremias fasciata species complex was largely influenced by the fragmentation of sand massifs in the region,” an abstract from the study read. “This same hypothesis has been used to explain the high level of endemism among the sand-dwelling species of reptiles along the Iranian Plateau in the same area. The two new species described herein can be distinguished from other congeneric species by their phylogenetic position and a combination of morphological characters. We use these data to discuss the taxonomy of Eremias based on morphology, habitat choice, and genetic data.”

    The study noted that the lizards can mainly be found scuttling around the vegetation found in the sand dunes, the Miami Herald reported. They can also be found burrowing for shade and shelter. The researchers reported that they typically eat insects.

    Closer analysis of the creature showed that it was most active during some hours in the morning, and evening. During the rest of the day, it tends to hide under the bushes of the sand dunes.

    So far, the new species has only been found near one road near the city of Tabas, in central-eastern Iran.