7 Amazing things your body does

As it turns out, there are quite a few things you didn't know about your body—including how many bones you have. According to Mammal Anatomy: An Illustrated Guide, you're born with about 300 bones, but as you grow, some of these fuse together as cartilage ossifies, eventually leaving you with 206 bones by the time you stop growing (once you've reach young adulthood).