• Smell cells
  Your smell receptor cells cover an area only about the size of a ...

• A good sniff
  Things smell stronger if you sniff their scent. When you breathe in ...

• Time for bed
  Your body cannot work all the time without a break. When you sleep, ...

• Keeping time
  Your body has a built-in 24-hour clock, which is controlled by a ...

• Amazing But True
  People living in parts of Rumania used to think that it was dangerous ...

• Slowing down
  When you sleep, your body slows down, but it never stops working ...

• Super Snorer
  If you sleep on your back, with your mouth open, you may snore. At ...

• DID YOU KNOW?
  You grow about 8mm (0.3in) in your sleep, but shrink again during the ...

• Breath of fresh air
  You yawn when you are tired, when you wake up, and when you are ...

• Walking in your sleep
  No one knows why people talk or walk in their sleep. They are usually ...