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  • Privacy Policy/Terms of Use

    Privacy Policy/Terms of Use

  • Brain and Nervous System

    If the brain is a central computer that controls all the functions of the body, then the nervous system is like a network that relays messages back and forth to different parts of the body. Find out how they work in this Body Basics article.

  • Gynecomastia

    Puberty can be confusing, especially when unexpected changes happen. Learn what gynecomastia is and why it happens.

  • Taking Charge of Your Medical Care

    Like learning to drive, figuring out health care is part of becoming an independent adult. Here are tips for teens on what that involves, and how to choose your own doctor.

  • Definition: Exchange Meal Plan

    Many people with diabetes use a food-balancing program called the exchange meal plan to guide what they eat each day.

  • Definition: Carbohydrate Counting

    Many people with diabetes use carbohydrate ("carb") counting to estimate the amount of carbohydrate in the foods they eat.

  • Definition: Pollen

    During the spring, summer, and fall, plants release pollen (a fine powder that is carried by the wind from plant to plant in order to fertilize them).

  • Sports Supplements

    Sports supplements are products used to enhance athletic performance. Lots of people who want to improve their performance have questions about how supplements work and whether they're safe.

  • Methamphetamine (Meth)

    Meth is a powerful stimulant drug that's extremely addictive and destructive. Find out how it works and why it's smart to avoid it.

  • Why Should I Care About Germs?

    Germs are tiny organisms that can cause disease - and they're so small that they can creep into your system without you noticing. Find out how to protect yourself.