This week on the Discovery Channel, it's "Shark Week". This popular week-long series is celebrating it's 25th anniversary this year, and it promises to be the best ever. Don't miss the show that features "Colossus", a great White Shark that is the star of the series. Don't Say You Heard It From Me But, Did You Know that Olympic swimming champion Michael Phelps and other top athletes learn to swim faster by mimicking the swimming motions of sharks and dolphins...natures fastest swimmers !!