WHAT'S INSIDE: HUMAN BODY

The human body is an amazing structure made up of many fascinating parts and systems. Learn about the human body and how its systems work together.
  • Body Parts
  • Body Systems
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How much do you know about the human body?
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Babies have adorable smiles and teeny tiny fingers, but there's a persistent rumor that these new, tiny humans don't have kneecaps. What's the story of a baby's bones?

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Why do you have two lungs but only one heart?

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?

Why does tickling the roof of your mouth with your tongue stifle a sneeze?

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!

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