Perhaps, in retrospect, there would be little motivation even for malevolent extraterrestrials to attack the Earth; perhaps, after a preliminary survey, they might decide it is more expedient just to be patient for a little while and wait for us to self-destruct.
Carl Sagan in Billions & Billions: Thoughts on Life and Death at the Brink of the Millennium
Added by Catalin Popescu
Comment! | Vote! | Copy! | In Romanian
