The polar regions are the coldest places on Earth. During the summer, the poles receive 24 hours of sunlight, but during the winter the sun is rarely visible. Animals that inhabit nature’s freezers ...

Polar bear fur resists ice because of a natural greasy coating called sebum. This helps them move quietly while hunting.

Polar bears have a built-in defense against ice — greasy fur. A team of scientists has discovered that their fur is coated in ...