The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
There are approximately three chickens for every human on Earth.
13
More than 25% of the world's forests are in Siberia.
51
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
Even Antarctica has an area code. It's 672.
58
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
Israel's Dead Sea is 1,312 feet below sea level.
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