»It's the Einstein Flip

      The International Year of Physics, as the United Nations has officially designated 2005, has already had its zany moments of physics fun, with more to come. This month, Ben Wallace, 18, a professional stunt cyclist, flew off a ramp in the London Science Museum and did a back flip 12 feet in the air while folding his bicycle sideways - a maneuver designed by a Cambridge physicist who said she was inspired by a tale that the 26-year-old Einstein had invented his theory of relativity while riding a bicycle.