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This floating-point number is extremely accurate,but must be transformed again for display on the limited screen of a stop watch.David Faux and Janet Godolphin at the University of Sur rey,UK,have found that this process introduces significant rounding errors.Faux says that in some cases,the difference be- tween reality and the display can be as high as 0.11 seconds. That difference is wider than that between gold and silver places in many Olympic Games events. To check their findings,the researchers created a computer model of a stopwatch and recorded over 3 million times.They found that each possible pair of final numbers showed an even (均等的)distribution.But when they passed the times through an algorithm (similar to those used to display numbers on