Make a society immortal and it becomes afraid of going outside: http://en.wikipedia.org/wiki/Brunnen-G http://en.wikipedia.org/wiki/Brunnen-G Or, you could end

Make a society immortal and it becomes afraid of going outside: http://en.wikipedia.org/wiki/Brunnen-G http://en.wikipedia.org/wiki/Brunnen-G Or, you could end up in the bottom of a cave for a few thousand years: http://en.wikipedia.org/wiki/Lorien_ http://en.wikipedia.org/wiki/Lorien_(Babylon_5)