Sometimes I think were alone in the universe, and sometimes I think were not. In either case the idea is quite staggering. – Arthur C. Clarke
He was thinking alone, and seriously racking his brain to find a direction for this single force four times multiplied, with which he did not doubt, as with the lever for which Archimedes sought, they should succeed in moving the world, when some one tapped gently at his door. – Alexandre Dumas