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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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Language and linguistics
Closed captions suck. Here’s one artist’s inventive project to make them better
8 minutes
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Thinkers and theories
A rare female scholar of the Roman Empire, Hypatia lived and died as a secular voice
5 minutes
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Anthropology
Why are witchcraft accusations so common across human societies?
4 minutes
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Wellbeing
Born in China, Zee seeks a gender-affirming life in the American Midwest
11 minutes
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Chemistry
Why do the building blocks of life possess a mysterious symmetry?
12 minutes
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Rituals and celebrations
A whale hunt is an act of prayer for an Inuit community north of the Arctic Circle
8 minutes
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Cosmology
Tiny, entangled universes that form or fizzle out – a theory of the quantum multiverse
11 minutes
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Astronomy
The history of astronomy is a history of conjuring intelligent life where it isn’t
34 minutes
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Politics and government
How it looked to Afghan women to see the Taliban return to power
33 minutes