By John Donvan
Originally published on Fri August 17, 2012 12:06 pm
The Discovery Channel's annual "Shark Week" is one of the longest running events on cable television. After 25 years on the air, the weeklong series of programming dedicated solely to sharks has become an American icon. Comedian Stephen Colbert has called it his second favorite time of year.
Legend has it that it all began as an idea scribbled down on a napkin during a brainstorming meeting.
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