The tusked mammals were wiped out in the seas around Britain when the last Ice Age ended more than 10,000 years ago. They use their distinctive whiskery snouts, packed with up to 700 hairs, to find food - typically crabs, marine worms, squids and molluscs.
There are estimated to be 250,000 in the world, most living around Canada and the Arctic. Mammal experts say they would struggle to survive if released in Britain as the climate is unsuitable.
Tools designed to ensure computer code in smart cars does not crash has been inspired by hungry penguins.
The rounded sleeping capsules send guests drifting into ocean before arriving on desert island by morning.
Sitting on the saddle activates the part of the brain responsible for learning, a study has claimed.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
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