Neutron bomb

When I was a kid I heard about a fabled 'neutron bomb' that would wipe out all humans, but leave everything else intact. Plants would continue to grow and animals would roam the empty halls of undisturbed cities completely devoid of human presence. There's something excitingly creepy about a scene like that...it's an image that reappears occasionally in cinema too -- for example some of the underwater scenes in Waterworld, the scenes of earth millions of years in the future in Spielberg's AI, and in Logan's Run too. I'm also thinking of H.G. Welles' Time Machine too. Well, I saw a cool link on digg.com today that has a little chart of how the earth would progressively change absent the presence of humans. Check it out here: http://www.worldwithoutus.com/did_you_know.html