The old testament tells the story of David, who slew Goliath with a stone thrown by his sling. It was centrifugal force that made the stone fly far faster than if David had simply thrown the stone. Without the sling he might just have made Goliath even madder, with David paying the price. That would have changed history an even affected our I-Phone contacts list. There would be dozens of friends and family named Goliath but no Davids. In the lab, centrifugation is one of t