Katy Perry - Performs Firework live at the Victoria's Secret Fashion Show on the 11/30/2010.
Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an Ame...
Astronomer Joe (''Dr. J'') Liske explains the significance of a new found planetary system in the European Southern Observatory's ''ESOca...
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Today's special, five pranks that made people question their sanity - or at very least their understanding of the la...