Prisoner’s dilemmas ponder what happens when two rational agents, unable to communicate with one another, must choose between betraying the other for a large individual reward or cooperating for a more modest shared reward. These thought experiments are accompanied by a caveat – if both agents betray one another, they’re left with nothing. One of the best-known examples of game theory, the implications of prisoner’s dilemmas are more than just theoretical, extending to real-life matters of government and diplomacy. Illustrated with whimsical felt stop-motion, this TED-Ed animation puzzles through two prisoner’s-dilemma scenarios in which gingerbread men are forced to chew over how to keep the maximum number of limbs.
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Cosmology
Tiny, entangled universes that form or fizzle out – a theory of the quantum multiverse
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Rituals and celebrations
A beginner’s guide to a joyful Persian tradition of spring renewal and rebirth
3 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
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Metaphysics
Simple entities in universal harmony – Leibniz’s evocative perspective on reality
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Biography and memoir
Passed over as the first Black astronaut, Ed Dwight carved out an impressive second act
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The ancient world
The six priestesses who kept the flame of ancient Rome alight at risk of death
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Engineering
A close-up look at electronic paper reveals its exquisite patterns – and limitations
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Architecture
West Africa was once an architectural laboratory. Is it time for a revival?
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