In any attempt to bridge the domains of experience belonging to the spiritual and physical sides of our nature, time occupies the key position.
—Arthur Stanley Eddington, 1928
Everything is determined, the beginning as well as the end, by forces over which we have no control. It is determined for insects as well as for the stars. Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune, intoned in the distance by an invisible piper.