Baseball Humidor Aids Fair Play in Denver

The World Series resumes tonight, and as the Rockies play Boston in Denver, you might hear something about a humidor. It's where the baseballs are kept, because in the Mile-High City, low humidity causes the balls to dry out, which makes them better home-run candidates.

University of Illinois professor Alan Nathan explains why this happens and how it changes the physics of the game.

Nathan talks with Andrea Seabrook.

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