http://kids.niehs.nih.gov/braint.htm
National Institute of Environmental Health Sciences, National Institutes of Health
Get hundreds of brainteasers and riddles about the environment and health for kids to solve. First check out the links to the human brain, the 3D video tour of the Brain's Inner Workings, and the BrainPop's Brain Movie and Quiz to learn more about the brain. Now try to solve the puzzles.