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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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Human evolution
Far from frivolous, cuteness is a powerful – and still mysterious – force of nature
6 minutes
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Dance and theatre
How a Noh mask-maker summons a lifelike face from a single block of wood
16 minutes
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The ancient world
What wine vessels reveal about politics and luxury in ancient Athens and Persia
16 minutes
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Art
David Goldblatt captured the contradictions of apartheid in stark black and white
15 minutes
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Space exploration
In the search for life, might alien ocean worlds be a better bet than Earth-like planets?
5 minutes
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Thinkers and theories
Is simulation theory a way to shirk responsibility for the world we’ve created?
13 minutes
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Biology
A dazzling slice-by-slice exploration of wood exposes hidden patterns and hues
2 minutes
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Family life
In Rwanda, Sébastien finds traces of personal history in the wake of national tragedy
21 minutes
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Dance and theatre
Leaf through Shakespeare’s First Folio for a riveting journey into theatre history
13 minutes