What’s with Goose Bumps?
What exactly gives you the heebie-jeebies? Or the delicious electric tingle that races down your spine and makes the hairs on your back stand up? Either way, and no matter what the cause is, chances are, at some point another, you’ve gone all bumpy for a moment or two. What’s the deal?
Darwin’s leftovers, that’s the deal. You can thank your Erector Pili. You’ve got bundles of smooth muscle fibers that would allow an animal to puff up their fur for insulation or to intimidate others. Clearly, we’ve lost the fur, but kept the mechanism.
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