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The early ancestors of plants were simple forms of algae, which drifted rootless through fresh waters. Most biologists believe that, only when algae partnered with a very different life form – fungi – some 470 million years ago, was it able thrive on land. Indeed, today some nine in 10 land plants exist in symbiosis with what’s known as ‘mycorrhizal’ fungi, which helps their roots to extract nutrients from the ground. This animation from the Society for the Protection of Underground Networks and the Fungi Foundation details how this hidden relationship operates, the vital role these underground fungal networks play in ecosystems worldwide, and the threats they currently face due to human activity.
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Love and friendship
Never marry a man you love too much, and other views on romance in Sierra Leone
5 minutes
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Engineering
Can monumental ‘ice stupas’ help remote Himalayan villages survive?
15 minutes
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History of technology
Curious singles and tech sceptics – what ‘computer dating’ looked like in 1966
6 minutes
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Cognition and intelligence
A father forgets his child’s name for the first time in this poetic reflection on memory
4 minutes
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Animals and humans
Join seabirds as they migrate, encountering human communities along the way
13 minutes
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Stories and literature
Two variants of a Hindu myth come alive in an animated ode to Indian storytelling
14 minutes
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Technology and the self
The commodified childhood – scenes from two sisters’ lives in the creator economy
14 minutes
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Fairness and equality
There’s a dirty side to clean energy in the metal-rich mountains of South Africa
10 minutes
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Food and drink
The passage of time is a peculiar thing in a 24-hour diner
14 minutes