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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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Animals and humans
One man’s quest to save an orphaned squirrel, as narrated by David Attenborough
14 minutes
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Computing and artificial intelligence
A future in which ‘artificial scientists’ make discoveries may not be far away
9 minutes
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History
Hags, seductresses, feminist icons – how gender dynamics manifest in witches
13 minutes
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Earth science and climate
Images carved into film form a haunting elegy for a disappearing slice of Earth
3 minutes
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Biology
Butterflies become unrecognisable landscapes when viewed under electron microscopes
4 minutes
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War and peace
Two Ukrainian boys’ summer unfolds just miles from the frontlines
22 minutes
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Nature and landscape
California’s landscapes provide endless inspiration for a woodcut printmaker
10 minutes
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Love and friendship
Never marry a man you love too much, and other views on romance in Sierra Leone
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Engineering
Can monumental ‘ice stupas’ help remote Himalayan villages survive?
15 minutes