If a balloon was filled by a vacuum -- rather than helium or air -- would it float? Check out this HowStuffWorks podcast to learn the science behind balloons and vacuum.
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BrainStuff Classics: What's the Controversy Behind 'Mary Had a Little Lamb'?
06:30

What Was the World's Largest Nuclear Weapon?
10:52

How Do Red-Tailed Hawks Work?
09:24