00:00Something cold just touched your skin.
00:03Watch what happens two layers down.
00:11This little guy is your erector pili muscle.
00:14And it just panicked.
00:24It yanks the hair follicle straight up
00:27and the skin around it puffs into a bump.
00:30Zoom out, and that's the goosebumps you just felt on your arm.
00:38Goosebumps.
00:41This trick used to fluff up thick fur to trap warmth
00:45or make our ancestors look bigger to predators.
00:50We kept the reflex.
00:52We just lost the fur that made it useful.
01:01So next time you get chills,
01:03that's a 200,000-year-old reflex,
01:06still clocking in for a job that doesn't exist anymore.
01:09We hope this trick used to be more.
01:09To be free, we have a cat we don't see it anymore.
01:09We hope this will be.
