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In races, we want to know who comes in first and how long it took him or her to finish. Before we used manual stopwatches, but today we use digital timers. There are many rules in races to make sure the times are accurate. People try to break world records in races, and the times are only fractions of a second apart.

Sports records -- Juvenile literature. --- Sports records. --- Time measurement -- Juvenile literature. --- Time measurements.