Every millisecond counts: the technology that clocks races

image of olympic track competition

Karsten Warholm, of Norway, third left, celebrates as he wins the gold medal ahead of Rai Benjamin, of United States in the final of the men’s 400-meter hurdles at the 2020 Summer Olympics, Tuesday, Aug. 3, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)

At the Olympics, dreams of gold can be realized or dashed by a single millisecond. Sam Brock looks at the advanced technology that’s deciding the closest of finishes in track and swimming.

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