WHAT'S INSIDE: HUMAN BODY
- Body Parts
- Body Systems
Why don't you have two hearts? Here's a hint: It's the same reason why you have one liver, but two eyes. Would a second heart help you live better?
You're trapped in a quiet place and you feel a sneeze coming on. You try desperately to remember how to stop a sneeze, but it's too late -- ACHOO! Next time, try tickling the roof of your mouth with your tongue. Really!