Neil deGrasse Tyson
Perhaps we've never been visited by aliens because they have looked upon Earth and decided there's no sign of intelligent life.
More quotes and aphorisms
The great questions of the day will not be settled...Patience is the companion...In the developed world, we are surrounded by electronics...I think I've discovered the secret of life...My father left his piano at the house when he left...Happiness in intelligent people is the rarest...