Hair is the only part of your head that can blow in the breeze. Let it blow beautifully with this Groupon: $50 gets you $100 worth of hair services at M Salon. M Salon, a luxury hair-care haven on Richmond Avenue, pampers follicles and keratins with the tender affection that most people reserve for friends, relatives, and lonely mailmen. 1905: Einstein's famous equation, E = mc2, hypothesizes a fusion-style reaction, while Einstein himself hypothesizes a romance between Meg Ryan and Tim Robbins. 1946: Designer bombs tested at Bikini Atoll create a variety of decorative cloud shapes, including beach ball, dolphin, and silhouette of the United States. 1978: Attempts to use nuclear fusion to prevent magician David Copperfield from appearing on TV are largely successful. 2010: Simultaneous, worldwide experiments with nuclear fusion result in the renewed popularity of player pianos and the transformation of friendly cats into gigantic-instrument-of-mayhem cats.