Patience: A polar bear still-hunting on the sea ice of Hudson Bay, Manitoba, Canada. (Courtesy: Jenny E Ross) In the teeth of the Arctic winter, polar-bear fur always remains free of ice – but how?

The World Wildlife Fund (WWF) charity has been working to support the trade in polar bear fur at the same time as using the animal image to raise funds.

Polar bears on ice in Northern Canada. Nano-physicist Bodil Holst's interest in polar bear fur began while she was watching a German quiz show. "I learned that polar bears are invisible in ...

The polar bears pass through Churchill, Manitoba, hoping to catch a ride out of the tiny town on Hudson Bay's sea ice. After a summer of fasting on land, the bears need to get back to their frozen ...

But, Holst noticed, polar bear fur did not freeze after getting wet. “I was very puzzled,” she says. “When they go into the water and out again, why do they not get covered in ice?” The work could ...

But, Holst noticed, polar bear fur did not freeze after getting wet. "I was very puzzled," she says. "When they go into the water and out again, why do they not get covered in ice?" The work could ...