The actors on the stage work their magic, turning a few disparate phrases - "challenge, giving birth, infinity, chaos, visiting a new country" - into a brief but charming improvised sketch, to the delight of the audience. But the viewers, filling a large auditorium at the Weizmann Institute of Science, expect more than to be entertained. Since the improvised play is part of a lecture by Prof. Uri Alon, a Molecular Cell Biologist, they know scientific insights are bound to follow.