I think that it is possible that two advanced civilizations exterminated each other long ago...
One interesting story in the Indian Veda's sort of goes along with this theory; The story describes what seem like nuclear weapons being used in an
ancient war.
Perhaps even more intriguing is the fact that there are a few places in India that are supposedly irradiated even though there haven't been any
nuclear explosions there.
here's some links that should help:
www.abovetopsecret.com...
www.para-normal.com...

