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Polar bear inspects a car (14 pictures)

Polar bear is the world’s largest bear. A boar (adult male) weighs around 350–700 kg (770–1,500 lb),while a sow (adult female) is about half that size. Due to the size and enormous power, the polar bear is a very dangerous animal. Seemingly, this situation does not look dangerously and luckily ended up safely, but you have to remember that wild animals are unpredictable.

Polar & non-polar molecules

Molecules come in infinite varieties, so in order to help the complicated chemical world make a little more sense, we classify and categorize them. One of the most important of those classifications is whether a molecule is polar or non-polar, which describes a kind of symmetry – not just of the molecule, but of the charge. In this edition of Crash Course Chemistry, Hank comes out for Team Polar, and describes why these molecules are so interesting to him.

Fractal Patterns in Dried Out Desert Rivers

This incredible aerial photograph by Adrian Franco was selected as National Geographic’s Picture of the Day for April 9, 2012. In it we see the incredible fractal patterns rivers (now dried out) have made as...