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 How Stealth Technology Work

Shaping an airplane a certain way -- or using materials that absorb radar waves -- causes a stealth aircraft to have the signature of a small bird, rather than an airplane. See more »

 Good question: Why do athletes have a slow heart rate compared to couch potatoes?

If you have a friend who runs marathons, you know that he/she has a "low resting heart rate". What this means is that, when your friend is sitting on the couch watching TV, his/her heart beats much more slowly than the heart of a "norm ... See more »