Foldit, an online video game, allows nontechnical, nonbiologist players to visually "fold" protein structures, while computers calculate the chemical interactions corresponding to each arrangement.

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Daniel Schultz, the FDA's chief device regulator, says new medical devices don't need the large-scale exhaustive trials of the drug industry because it is easier to predict the behavior of a machine than it is to track the chemical interactions of a new drug in the body.

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Chemical reactions are caused by interactions between the electrons of the reagents.

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