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Picture this: You’re sitting on your couch in the dark alone, watching a scary movie. The killer is walking toward an unsuspecting victim, then suddenly jumps out at her. In that moment, the hairs on your body stand up, and you get a shiver down your spine. When you go for a walk on a crisp morning, the same thing happens. When the music swells during your favorite song, you get the shivers again, this time with the little goosebumps on your arms that appear when you get that sensation. What is going on?
There’s a good reason for shivers and goosebumps: They’re your body’s response to emotion or stress. We got this from our animal ancestors: When they were cold, the hair on their bodies would stand up—the movement of the arrector pili muscle would cause the skin to contract, raising each hair—to provide an extra layer of insulation.
This response is also in play when animals feel threatened; their natural reaction is to try to look bigger than their attacker, so their skin and hair expand to play up that effect. The part of the brain called the hypothalamus is what controls this reaction.
Shivering can also be a sign that the body is attempting to warm itself up. According to a post on McGill University’s Office for Science and Society blog, “Shivering is our body’s way of raising its core temperature to bring it back to a state of homeostasis … If body temperature dips below the normal 98.6° F (37° Celsius), we will start shivering, which will then cause muscles to contract and then relax very rapidly, thereby expending energy to warm up the whole body. These muscle contractions cause limbs to shake and also teeth to chatter. Shivering, similar to blood pressure and heart rate, is an automatic and totally involuntary function that the body performs to regulate itself.”
So why do goosebumps—also known as cutis anserina or piloerection—appear when it’s not for a functional purpose like looking larger or creating insulation? It’s because our emotions are also connected with the hypothalamus, so sometimes goosebumps are just our body reacting to our brain’s signals of intense emotion.
When we feel things like love, fear, or sadness, the hypothalamus sends a signal to our bodies that produces adrenaline in our blood. The signal triggers the arrector pili muscles to contract, and then we have goosebumps caused by emotion. The sudden adrenaline rush may also cause sweaty palms, tears, increased blood pressure, or shivers. That shiver down your spine goes goes by several names: Some call it frisson, or “shiver” in French, especially when music is involved; others go with terms like aesthetic chills [PDF] or psychogenic shivers.
When we watch movies or listen to music and get shivers, it’s a mixture of subjective emotions toward the film or song and physiological arousal. If we watch a movie or hear a song we get excited about, or one that makes us sad, the hypothalamus reacts to the sudden change in emotion and we physically feel the shiver along our spine.
Now that you know why we get shivers down our spines (even when we’re not cold), read up on people who can control their goosebumps.
A version of this story ran in 2012; it has been updated for 2023.
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Stephanie DePetrillo
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Keep still.
. Febantel works similarly to the praziquantel in the way it’s metabolized, but then it eliminates the whipworms by blocking their energy processing power. Without the ability to metabolize their own energy the whipworms are forced to hit the bricks, or the grass, or the pine straw, or the litter box. Wherever your pet does its business.


head to handle one of these rescued fighters, but it just goes to show that no amount of mistreatment is as powerful as kindness.
infamous sort of notoriety. They became associated with witches as familiars and servants of the devil.
feral counterparts, muddying up the bloodlines and making their exact origins difficult to pin down. This seems in keeping with their mysterious personalities, which ironically is probably why they were so endeared them to the human species.
place to keep greedy dog food makers from placing meaningless labels onto their products. The terms “Holistic” and “Organic” mean effectively nothing when stamped on the side of your favorite puppy chow. They are undefined and disingenuous. “All Natural” is kind of tricky too. It can mean that there aren’t any synthetic ingredients in the feed, but it can also mean there is only a small amount.
isn’t exactly good for people, (though excessive consumption does occasionally have a well-known side effect of making you an awesome dancer) so it should come as no surprise that it is absolutely terrible for dogs. Also unsurprisingly, just as people are inexorably drawn to booze, dogs love it too.





These dangerous parasites haven’t got a prayer against the combined might of two powerful active ingredients in the makeup of Trifexis. If you’re old enough, you may have heard of spinosad, a powerful insect killer developed in the late nineties to protect agriculture without any adverse environmental effects. Now it’s doing the job inside your dog’s biochemistry with equal cautious care.
scientific mumbo jumbo isn’t really all that important to the drug purchasing laymen. The average pet owner only cares about one thing. Does it work? Sure enough, this drug garners praise and subscriptions from various veterinary facilities for good reason. The 
These disgusting parasites are a commonly creepy problem for pets. Fortunately, the worms are more of an annoyance than a legitimate threat. Treatment is relatively painless, and it can be quite reasonable if you head to the right
other signs and head to the computer to point and click your way to parasite destruction.




