Perhaps you have heard the geese honking as they fly northward in a "V" formation. They head toward the grain fields of Canada and Alaska to spend the summer. Two engineers calibrated in a wind tunnel why geese fly in formation. Each goose, flapping its wings, creates an uplift for the goose that follows. The whole flock gains 71% greater flying range than if they journeyed alone. That's why the leader of the "V" formation falls back periodically to let another leader take the point, and why the rest stay in line.