• Speedy or slow
  The hormone, thyroxine, made by your thyroid gland, controls the use ...

• See-through body
  X-rays are used to look inside your body and take photographs of it. ...

• When does an owl sound like a snake?
  Burrowing owls of American deserts are talented mimics. They can make ...

• What plants do reindeer eat?
  Reindeer (or caribou) survive the Arctic winter by foraging for food. ...

• Sweet dreams
  Shallow sleep is also called REM sleep. This stands for Rapid Eye ...