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• What Does REM Stand for? for Kids

  
  

  This is short for rapid eye movement, the stage of sleep when your eyes move back and forth under your closed eyelids and you have dreams.

• What Are Tendons? for Kids

  
  

  For keeping things together, tendons come in handy!

• What Is Frostbite? for Kids

  
  

  Brrrrr . . . pass the hat and mittens, please!

• What's a Rheumatologist? for Kids

  
  

  This special doctor deals with rheumatological problems (conditions that involve swelling and pain in muscles and joints).

• What's the Palate? for Kids

  
  

  You've probably tickled this part of your mouth with your tongue before.

• What's the Pancreas? for Kids

  
  

  The pancreas is a long, flat gland in your belly.

• What's a Whitehead? for Kids

  
  

  People with acne may have different types of bumps on their skin.

• What Is DNA? for Kids

  
  

  DNA is the genetic information inside the cells of the body that helps make people who they are.

• What Are White Blood Cells? for Kids

  
  

  White blood cells are part of the germ-fighting immune system.

• What Is the Glycemic Index? for Kids

  
  

  The body breaks down most carbohydrates from the foods we eat and changes them to a type of sugar called glucose. The glycemic index is a way of measuring how fast this happens and how a food affects blood glucose levels.