The Discovery Channel's Shark Week, which first aired on July 17, 1987, is a week-long series of feature television programs dedicated to sharks. Held annually, normally running in July or August, Shark Week was originally developed to raise awareness and respect for sharks. Now broadcast in over 72 countries, Shark Week is promoted heavily via social networks like Facebook and Twitter. In 2000, six million 3D Pulfrich glasses were distributed to viewers in the United States and Canada for an episode featuring an extinct giant shark, which had 3D segments. In 2005, Adam Savage and Jamie Hyneman from the Discovery Channel series MythBusters hosted Shark Week, and a two-hour MythBusters 'Jaws Special' was premiered for the event. In 2006, Mike Rowe from Dirty Jobs hosted, and two Dirty Jobs episodes were featured, titled 'Jobs that Bite' and 'Jobs that BiteHarder'.
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