Peaty v Bolt: Which is the greatest world record?

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Adam Peaty and Usain Bolt have both set world records that put them well ahead of their opponents - but which world record is more outstanding? We use statistics to compare the records to each other, and to other benchmarks in the world of athletics and swimming. Presenter: Tim Harford Producer: Richard Vadon Image: Adam Peaty competes at the 2019 FINA World Championships. Credit: Catherine Ivill /Getty Images.