In the folklore of physics, no story is better known than the tale of Galileo dropping balls from the Leaning Tower of Pisa and proving that gravity accelerates all objects equally regardless of their masses or composition. This is called the "equivalence principle," and it is a cornerstone of modern physics. But was Galileo correct? Fantastically small violations of the equivalence principle may in fact exist, providing a test of string theory and pointing the way to an all-encompassing Theory of Everything.

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http://science.nasa.gov/headlines/y2007/18may_equivalenceprinciple.htm?list882224

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