Fox: He's charming. He's talented. And his boyish good looks led him to be cast in the hit TV show "Family Ties." But it wasn't until he starred as Marty McFly in the "Back to the Future" trilogy that he became every teen girl's dream guy.
Bouncy balls rebound in response to the amount of force used when they contact hard surfaces. That simply means that a bouncy ball will bounce back at you with about 80 percent of the energy you used .