Yeah but just because we don't know the answer doesn't mean we accept any answer. It would be like me asking who used all the toilet roll and nobody knowing then me telling everyone it was aliens. It's the kind of logic children use whereas as adults we should be comfortable with the answer "I don't know" instead of creating childish fairy stories to cover our ignorance. Science is the ability to say "I don't know" and spending you life trying to find out. The Bear.