Nemours is a nonprofit pediatric health system dedicated to:

life-changing medical care and research.
helping kids grow up healthy.
advocating for kids nationally.
training tomorrow’s pediatric experts.

Nemours also runs KidsHealth, "the web's most visited site about children's health". The site is filled with fun games, quizzes, and movies, all teaching youths about health. It also contains a glossary that explains medical terms in words that children can comprehend. There are also links to two external sites, one for teens and one for parents. Check out Kidshealth here!