På BBC Earth i går

Christine's sister Catherine gets to grips with Arctic life when she visits from England. Meanwhile, snowmobile guide Alex attempts to take his girlfriend Karolina on a romantic trip.

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The Great British Intelligence Test measures the brainpower of the nation in one of the largest intelligence experiments of its kind.

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See how CGI imagery, the latest scientific research and archive footage created the series. In this episode: looking at the sun.

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In the depths of winter, the off-grid Alaskans work tirelessly to combat the deep cold.

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Vi tar en titt på naturens rariteter, deriblant et dyr med superlang hals og et annet med elastisk tunge.

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A fierce winter storm threatens Sue's all important fuel supply, and Erik struggles to capture a thieving wolf.

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The James Webb Space Telescope will be the space observatory of the next decade when it launches. In addition to investigating the wealth of planets outside of our solar system, the observatory will peer back to some of the earliest galaxies that formed after the Big Bang - and the very structure of the universe.

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For 250 years, Japan has thrived, mostly cut off from the west – until US gunboats arrive.

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Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

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The struggle for survival in Alaska continues for Sue, Jessie, Glenn and the Hailstones.

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David presents animal species whose seasonal (dis)appearing has puzzled men for centuries. First geese and other migratory birds, which were long supposed to 'hibernate' in bizarre ways, a matter of dispute centuries even after emperor-falconer Frederic Hohenstaufen wrote down the actual fact. Next butterflies, who were believed 'sponteously generated' until people realized they are the adult form of utterly dissimilar caterpillars.

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An orphaned baby triceratops must outwit a deadly T. rex. Can she survive?

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As the cold season wanes in the Arctic, winter does not go quietly into the night.

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See how CGI imagery, the latest scientific research and archive footage created the series. In this episode: looking at the sun.

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Professor Thilaganathan provides pioneering care to Ann-Marie's twins, who are at risk of dying, and Becky's unborn baby, who has a rare lung tumour, and closely monitors Randika's pregnancy.

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Doctor Martin Eckhardt explains how his small team have dealt with frost bite, polar bear attacks and emergency rescues. Christine prepares for the island's biggest dog sled race.

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Lucy plunges further into the unknown reaches of the Amazon, coming face to face with hostile giant wasps, caiman-infested rivers, and more deadly snakes.

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David presents animal species whose seasonal (dis)appearing has puzzled men for centuries. First geese and other migratory birds, which were long supposed to 'hibernate' in bizarre ways, a matter of dispute centuries even after emperor-falconer Frederic Hohenstaufen wrote down the actual fact. Next butterflies, who were believed 'sponteously generated' until people realized they are the adult form of utterly dissimilar caterpillars.

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As the cold season wanes in the Arctic, winter does not go quietly into the night.

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