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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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Ecology and environmental sciences
GPS tracking reveals stunning insights into the patterns of migratory birds
6 minutes
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Human rights and justice
Can providing humanitarian aid be illegal? A troubling case from the US-Mexico border
17 minutes
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Space exploration
The rarely told story of the fruit flies, primates and canines that preceded us in space
12 minutes
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Film and visual culture
A lush animated opus evokes the frenzied pace of modern life
4 minutes
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Family life
The precious family keepsakes that hold meaning for generations
10 minutes
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Neuroscience
This intricate map of a fruit fly brain could signal a revolution in neuroscience
2 minutes
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Archaeology
What did the first people who entered Tutankhamun’s tomb see?
5 minutes
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Information and communication
Coverage of the ‘balloon boy’ hoax forms a withering indictment of for-profit news
17 minutes
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Childhood and adolescence
Marmar is living through a devastating war – but she’d rather tell you about her new dress
8 minutes