"Time measurements Juvenile literature." . . "Engineering." . . "Sports records." . . "Sports records Juvenile literature." . . "Mathematics." . . "Electrical engineering." . . . . "Time measurements." . . . . . . . "Timing Races Measuring Time"@en . "Electronic books"@en . "Measuring time"@en . . . . "Timing races : measuring time"@en . "\"Learn about time and how it is measured in racing competitions.\" --"@en . . . . . . "Juvenile works"@en . . . . "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."@en . . "Teacher Created Materials, Inc." . .