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A year later than planned, The Tokyo Olympics, have now finished. Thousands of athletes have competed in events that few thought might go ahead and there’s been record success.

This week we take a look at Olympic numbers – how many records were broken in Tokyo, what factors might have influenced the races and what else can the data tell us?

Tim Harford speaks to Dr Joel Mason, who runs the blog, Trackademic.

Producer: Olivia Noon