50 Wacky Things Humans Do describes 50 weird, wild, and unbelievable things the human body is able to do. Science has never been so much fun! Did you know that when you sneeze it rockets out at over one-hundred miles per hour? How about that the average person sheds about five hundred million skin cells every day? What about the fact that most of the cells in your body are not even human?! 50 Wacky Things...