It's tricky business, but there's a lot you can figure out from a human skeleton if you know what you're doing.
While we humans get concussions pretty easily, bighorn sheep slam their heads into each other all the time without ill affects. How is this possible?
As we all learned in health class, human beings have 32 teeth. Twenty-eight of them come in before puberty, but the last four teeth, our “third molars,” usually come in during our late teens or early 20′s, when we’re presumably older and wiser, hence their nickname, wisdom teeth. Lean more on this Moment of Science.