Start your stopwatches, set your timers, turn back your clocks because Izzie and Dr Becky are talking time. What is it? How, and why, do we measure it? And is time real or a human construct?!

Izzie speaks with Anne Curtis at the National Physical Laboratory who works on one of the world’s most accurate clocks, and editor Richard has been to the very heart of time itself in Greenwich with Finn Burridge at the Royal Observatory.

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The Supermassive Podcast is a Boffin Media production. The producers are Izzie Clarke and Richard Hollingham.

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