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© 1983 SCIENTIFIC AMERICAN, INC

01;" thrown may also lead to difficulties with other actions. Inexperienced bas ketball players systematically shoot the ball much too hard when they drive toward the basket, often slamming the ball against the backboard. Novice foot ball quarterbacks often find it hard to throw a pass accurately while they are running. A recent story in the Baltimore Sun described the attempts of a man who could juggle while he was riding a unicycle to teach the skill to another uni cyclist. The juggler told the trainee to throw the balls straight up as she moved forward on the unicycle, but the trainee questioned the appropriateness of the instruction on the grounds that the balls would fall behind her as the unicycle moved forward.