Grad student invents gravity lamp

A U.S. graduate student won second place in a "Greener Gadgets Conference" competition inventing a floor lamp powered by gravity.

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<p><a href="http://www.physorg.com/news122622236.html">Grad student invents gravity lamp</a></p> <p>A U.S. graduate student won second place in a "Greener Gadgets Conference" competition inventing a floor lamp powered by gravity. </p>