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A relative of jellyfish, the rice-sized freshwater creatures known as hydra are, at first glance, rather basic – all tentacles and mouth, with lives dedicated to nabbing passing prey. But, as scientists have gradually been discovering over centuries, these simple organisms have such a unique capacity for regeneration that they’re considered biologically immortal. As this video from the science documentary series Deep Look explores, the hydra’s ability to rebuild itself is so powerful that the animal can even reform after being essentially blended at a cellular level. Providing astonishing high-definition glimpses of its microscopic world, this short details why the secret to the hydra’s invincibility is in its stem cells, and how scientists hope to harness its qualities to benefit humans.
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Nature and landscape
Take a serene hike through an ancient forest, inspired by a Miyazaki masterpiece
6 minutes
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Design and fashion
The mundane becomes mesmerising in this deep dive into segmented displays
14 minutes
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Physics
A song of ice, fire and jelly – exploring the physics and history of the trumpet
9 minutes
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Animals and humans
An artist and ants collaborate on an exhibit of ‘tiny Abstract Expressionist paintings’
5 minutes
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Mathematics
How a curious question about colouring maps changed mathematics forever
9 minutes
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Physics
A dreamy tribute to the music of Brian Eno, rendered in paint, soap and water
2 minutes
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Biology
To understand how an animal sees the world, start with the shape of its pupils
5 minutes
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Technology and the self
Why we should worry less about ‘sentient’ AIs and more about what we’re teaching them
16 minutes
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Physics
Why does the Sun occasionally flash green as it eclipses the horizon?
7 minutes