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Dolphins sleep with only one side of their brain, keeping one eye open and one eye closed. They surface every 20 to 30 minutes to breathe, and they are never totally unconscious while sleeping.

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Male dolphins are called bulls, female dolphins are called cows and baby dolphins are called calves.

Animals

A dolphin's flipper is made up of five distinct bone structures, similar to that of a human hand.

Animals

It's a common belief that humans use only 10 percent of their brains. MRI imaging has shown that humans actually use most of their brain, even while sleeping.

Science

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The Pacific Ocean is the biggest ocean in the world, accounting for 32% of the world's total surface area. That's slightly more than all the land in the world combined.

World

Dragonflies use 80% of their brainpower just to process vision signals. They are capable of seeing everything around them without moving their eyes.

Animals

The goldfish has been found to have a memory-span of at least 3 months. There have also been a few people who actually trained their goldfish to do tricks!

Animals

The Tennessee Aquarium is home to Electric Miguel, an electric eel with a Twitter account. He sends out tweets by generating high voltage electrical discharges.

Animals

The sailfish is the fastest fish in the world, capable of reaching speeds of 68 miles per hour (110 km/h).

Animals

Octopuses don't have tentacles, they have eight arms. Arms are more versatile than tentacles and can perform much finer movements.

Animals

The fur of sea otters can have more than 650,000 strands of hair per square inch. It helps to keep them insulated while swimming in cold waters.

Animals

In Laguna, Brazil, dolphins help fishermen to catch fish. The dolphins round up the fish and signal the fishermen to cast their nets. More than 200 families rely on the daily catch.

Animals

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The human brain receives 400 million bits (47 Megabytes) of information every second. Of those, we are only consciously aware of 2000 bits (0.0002 megabytes).

Science

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.

Animals

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.

Animals

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