A friend of mine (an old man in his 70's) watched the History Channel shows on The Universe and the Big Bang Theory and all that and asked me - "so what if the universe started with a big bang? what good does it do me by knowing this fact? why worry about all this stuff in the universe when there is so much on Earth to worry about? why can't all these scientists on TV put their heads together to solve (more immediate) problems here on Earth than worrying about the ones outside Earth?" I haven't answered him yet...What do I tell him?