... about 90 percent complete. But doctors say a lot of children aren't getting what they need to do that. Calcium and vitamin D are essential, sure, but so is lots of time jumping and running. "It's the magic window of time when bone is built," says ...
http://www.wnyc.org/story/the-recipe-for-strong-teenage-bones-exercise-calcium-and-d/
http://www.wnyc.org/story/the-recipe-for-strong-teenage-bones-exercise-calcium-and-d/
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