Rats multiply so quickly that in 18 months, two rats could have over a million descendants.
The human brain uses approximately as much energy as a 10 watt light bulb
Antarctica holds about 70% of the world's freshwater in its ice.
The Giant South African Earthworm (Microhaetus rappi) can grow up to 7 meters (22 feet) long and 2.5 cm (1 inch) in diameter.
The combined internal surface area of a pair of human lungs is equal to about the area of a tennis court.
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