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Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do.

Stephen Hawking
Race, Survival, September 11
"Colonies in space may be only hope, says Hawking". Interview with Roger Highfield, www.telegraph.co.uk. October 16, 2001.
Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do.