First broadcast: on BBC FourLatest broadcast: on BBC Four
Professor Marcus du Sautoy explores why we are driven to measure and quantify the world around us. He begins by telling the story of the metre and the second. Show more
First broadcast: on BBC FourLatest broadcast: on BBC Four
Marcus du Sautoy explores the history of Le Grand K - the world's master kilogramme - and the race to replace it now that it has been discovered to be losing weight. Show more
First broadcast: on BBC FourLatest broadcast: on BBC Four
From lightning bolts to single electrons, Marcus du Sautoy reveals how we came to measure and harness the power of heat, light and electricity. Show more