Lake Baikal one-fifth world fresh surface water

Lake Baikal holds more than one-fifth of Earth's fresh surface water

Lake Baikal is the deepest freshwater lake in the world. It contains more than one-fifth of all unfrozen fresh water found on Earth's surface.

An ancient number system still shapes our clocks and circles

Ancient Mesopotamians used a number system based on 60. Traces of it remain in everyday measurements: an hour has 60 minutes, and a circle has 360 degrees.

Fish do not fit a simple ladder of animal intelligence

Mammals and birds have often been treated as smarter partly because their brains are large compared with their bodies. But fish can form mental maps, stop automatic actions, change learned rules, solve new obstacles, and show responses linked to the states of other fish. Animal intelligence does not fit neatly onto one ladder.

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Lake Baikal one-fifth world fresh surface water

Lake Baikal holds more than one-fifth of Earth's fresh surface water

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