Neil DeGrasse Tyson talks about his book, "Death By Black Hole" and warns us of a very real asteroid collision scheduled in 20 years. It's not a certainty but, as he says, it would be awfully embarrassing to let it hit us!
The embedding link doesn't work properly so I can only give the address:
http://fora.tv/2007/02/09/Death_By_Black_Hole
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