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Human Body Questions

How the body works, from bones and blood to sleep and the senses. General information, not medical advice.

  1. How much sleep do adults need?Human Body
  2. What percentage of the human body is water?Human Body
  3. Why do we yawn?Human Body
  4. What is the largest organ in the human body?Human Body
  5. How many bones are in the human body?Human Body