• How long are the intestines?
  The small intestine is more than three times as long as the whole ...

• Why does a blocked nose stop you tasting?
  When you eat, you both taste and smell the food. If your nose is ...

• What is the appendix?
  The appendix is a spare part of the large intestine that plays no ...

• Why do you have two ears?
  Two ears help you to detect which direction sounds are coming from.

• How do you measure sound?
  The loudness of a sound is measured in decibels. The sound of a pin ...

• Why do your ears pop?
  If you are flying in an aircraft and it changes height quickly, you ...

• What makes you cry?
  If dust or something gets into your eye, the tear gland above the eye ...

• How do you see color?
  Different nerve cells in the retina react to the colors red, blue, ...

• Why can’t you see color when it starts to get dark?
  The cells that react to colored light-called cones-only work in ...

• Can sunshine damage the eye?
  Sunshine contains ultraviolet rays, which can damage your eyes as ...