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Yellowstone’s reintroduction of wolves in 1995 is one of the best-known instances of a trophic cascade – a single change in a food chain that transforms an entire ecosystem. The return of the wolves rejuvenated wildlife in the park from top to bottom, even changing the area’s physical geography as native animals and plants reasserted themselves. Narrated by George Monbiot, How Wolves Change Rivers chronicles how Yellowstone’s extraordinary success in rewilding stems from a decrease in invasive and overpopulated species such as coyote and deer thanks to just 66 wolves returning after a 70-year absence from the park.
Video by Sustainable Human
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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
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Work
A Swedish expat in the Philippines wonders: what’s up with people sleeping at work?
14 minutes
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Cognition and intelligence
What’s this buzz about bees having culture? Inside a groundbreaking experiment
8 minutes
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Earth science and climate
The only man permitted in Bhutan’s sacred mountains chronicles humanity’s impact
22 minutes
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Cosmology
The Indian astronomer whose innovative work on black holes was mocked at Cambridge
13 minutes
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Art
‘If you’re creative, why can’t you create a solution?’ One artist’s imaginative activism
17 minutes
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The ancient world
An ancient Roman’s hilarious (and perhaps relatable) response to a social snub
2 minutes
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Death
A hunter’s lyrical reflection on the humbling business of being mortal
6 minutes