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Polar bears are natural loners, but they transform into social, playful creatures when it comes time to find a mate. In this excerpt from the BBC’s ‘Life Story’ series, a male polar bear tracks the scent of a female over several weeks before she engages him in a rigorous test of fitness. The test, it turns out, is all about play – rolling in the snow, clambering up steep, slippery slopes and chasing each other about. When the male tires, the female has a few flirty tricks left to entice him back to his feet.
Narrator: David Attenborough
Watch the elegant flow of a sheep herd, seen from the sky above Israel
How would a piano sound on Mars? Embark on an interplanetary sonic journey
When two punk bands came to a psychiatric hospital, beautiful chaos ensued
Design and fashion
Gear up for a stylish celebration of vintage motorcycle design
An ode to the humble rotifer – one of nature’s simplest and strangest creatures
Check in to the Hilbert Hotel, and learn why some infinities are bigger than others
Cognition and intelligence
How a ‘periodic table’ of animal intelligence could help to root out human bias
A climate activist living off-grid faces her toughest challenge yet – a new primary school
The city as an emergent life form, with architecture as the skeleton and roads as veins