Tornadoes

How tornadoes form The most destructive and deadly tornadoes come from huge supercell thunderstorms, which have air that rises from the ground into the bottom…

Presidential approval tracker

Presidential approval tracker The Gallup organization first started asking Americans how they approved of the job the president was doing in the 1940s. See how…

Tennis’ sonic boom

Tennis’ sonic boom Andy Roddick is known for his big serve, and he has the record for fastest serve (155 mph). At 6-2 he isn’t…

Nadal’s Quick Forehand Snap

Nadal’s Quick Forehand Snap Rafael Nadal’s recent hot streak — including back-to-back Grand Slam championships at the French Open and Wimbledon — has propelled him…