"Physicists and astronomers see their own implications in the world being round, but to me it means that only one-third of the world is asleep at any given time and the other two-thirds is up to something"

This quote by Dean Rusk is an amusing take on the implications of the world being round. To physicists and astronomers, the roundness of the world has implications for the laws of physics and the movements of the stars and worlds. However, Rusk suggests that the roundness of the world has a more useful implication: that at any offered time, only one-third of the world is asleep. This suggests that the other two-thirds of the world is awake and actively doing something. This might be anything from working, to studying, to taking part in leisure activities. Rusk's quote is a tip that the world is constantly in movement, and that there is always something going on someplace.