The scientific properties of sound and air pressure are explained when CU Wizard Michael Dubson presents his show, "Boom! The Physics of Sound and Air Pressure," on Saturday, Dec. 20, at 9:30 a.m. in Duane Physics, room G1B30. During the free hour-long show, Dubson, a senior instructor in the physics department at the University of Colorado at Boulder, will implode a 50-gallon steel drum using air pressure, create a sonic boom with a bullwhip and stage a tug-of-war with the pressure of the atmosphere.