There is only a certain amount of stress biological structures can withstand before they fall apart. Tissue fluids freeze into ice crystals when exposed to temperatures below −3 °C, for instance, and ...

Is a polar bear really white? How much snow does Antarctica get? How many layers of clothing do people need to wear to stay warm? Students learn about the polar regions and how animals and people suit ...

WASHINGTON, June 16 (Reuters) - An isolated population of polar bears in Greenland has made a clever adaptation to the decline in the sea ice they depend upon as a platform for hunting seals, offering ...