You'd think by the time you reach your 20s or so, you'd know everything you need to know about your face. You have a pretty good idea how it all works and how to take care of it, right? But let's face facts about face facts: there are plenty of things you don't know!
Human face biology and anatomy, just like the rest of our weirdo parts, are fascinating and insanely complex. Scientists and evolutionary biologists are discovering new things all the time (the creepiest fact on this list, for example, wasn't well-known until 2015). Pinch your cheeks, count your eyelashes, and prepare to learn a bunch of cool new facts about human faces.