Here's Why You Get Goosebumps When You Hear Adele Hit That High Note

Evolution is a weird thing

Fun fact: You used to have a tail. Yes, really. Back when you were an itty-bitty embryo in your mom's stomach, your tailbone led into an actual, well, tail.

A new video from Vox's Observatory series explains the science behind evolution and points out all the human anatomy -- your tailbone and ear muscles, to name a few examples -- that's a direct result of evolution. We have a lot more in common with our primate ancestors than you think.

Why do we get goosebumps when we're cold or when we hear Adele hit that incredible high note? Why do babies grab onto anything their little fingers touch? Find out all the answers right here, right now: