Did you know that a sneeze moves at about 100 mph? Or that an average person sheds up to 500 million skin cells a day? Did you know that a large portion of the cells in your body are not human? 50 Wacky Things Humans Do describes 50 unbelievably weird things about the human body that seem too crazy to be true, but are! Whether amazing, silly, or just plain gross, these peculiar and fascinating things about the human body will surprise and delight fun-fact lovers of all ages.