Freeride skiers Jon, Andrew and Zach hit some of Colorado's most extreme halfpipes, using science to maximize their 360 spins. * John and Kevin look at the scientific ups and downs of yo-yos. * Meet Microsoft game designer David Ortiz, mastermind behind Xbox's NFL Fever 2002 game. * And DragonflyTV asks: how can you read a message on a spinning Frisbee?