If you asked 1,000 people how good they knew their bodies, probably 100 percent of them would say extremely well. But surprisingly, there are a lot of things that even the most knowledgeable individuals don’t know. After all, the body is complex. And every year, medical professionals, scientists, and researchers discover new things.

These 60 facts about the body will astound you. So, buckle up and get ready for a crazy ride.