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Measuring the length of a second might seem simple, but this history of the time unit from TED-Ed shows how the road to the modern, standardised second was anything but. Written by John Kitching, a Fellow at the US National Institute of Standards and Technology, the video details how the advent of global communications and transit systems left the world in need of a more precise and universal understanding of a second – and how that search ultimately led to the atomic clock.
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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
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Metaphysics
Simple entities in universal harmony – Leibniz’s evocative perspective on reality
4 minutes
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Biography and memoir
Passed over as the first Black astronaut, Ed Dwight carved out an impressive second act
13 minutes
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The ancient world
The six priestesses who kept the flame of ancient Rome alight at risk of death
5 minutes
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Engineering
A close-up look at electronic paper reveals its exquisite patterns – and limitations
9 minutes
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Architecture
West Africa was once an architectural laboratory. Is it time for a revival?
12 minutes