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All the gold that has been mined in the world adds up to about four Olympic sized swimming pools.

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The world fastest unassisted swim across the English Channel is 6 hours and 58 minutes. The distance is approximately 33km (21 miles). Due to the currents, the actual swimming distance is much longer.

Marlin fish found in the Atlantic ocean are big and fast. They weigh up 1,400lbs (630kg) and can swim 50 miles per hour (80km/h). Their pointy spear helps them hunt tuna and mackerel.

Indus river dolphins sleep in very short intervals, lasting at most one minute. Strong river currents require them to keep swimming, allowing little time for sleep.

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A city the size of New York consumes 1 billion U.S. gallons of water per day; enough to fill 1,480 Olympic sized swimming pools.

Elephants can swim with their head completely under water and their trunk just above the water surface for breathing, similar to a snorkel.

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