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In this clip from the celebrated science education series Cosmos (1980), the astronomer Carl Sagan explores the life and legacy of the ancient Greek polymath Eratosthenes, who, in the 3rd century BCE, not only understood Earth to be spherical, but was able to calculate its circumference with remarkable accuracy. In detailing Eratosthenes’ ingenious methods, Sagan provides a fascinating science history lesson that doubles as a tribute to the remarkable ingenuity of ancient thinkers, who were able to uncover extraordinary truths with the simplest of tools.
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Family life
One family’s harrowing escape from postwar Vietnam, told in a poignant metaphor
10 minutes
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Fairness and equality
Visit the small Texas community that lives in the shadow of SpaceX launches
14 minutes
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Film and visual culture
Our world has very different contours when a millimetre is blown up to a full screen
8 minutes
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War and peace
A frontline soldier’s moving account of the fabled ‘Christmas truce’ of 1914
12 minutes
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History of technology
Replicating Shakespearean-era printing brings its own dramas and comedy
19 minutes
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Animals and humans
The wild tale of a young animal keeper, an angry tiger and a torn circle net
10 minutes
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Technology and the self
Why single Chinese women are freezing their eggs in California
24 minutes
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The ancient world
Petty squabbles and bloody battles – the life of an ancient Roman soldier
18 minutes
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Astronomy
The remarkable innovations inspired by our need to know the night sky
5 minutes