2013 was the first year since 1987 to feature four different numbers.

Fleas can jump 130 times higher than their own height. In human terms this is equal to a 6 foot person jumping 780 feet into the air.

The average annual low for South pole is -61, compared with -3 at the North pole. The lowest temperature ever recorded at the South Pole is -117, while the record at the North Pole is -59.

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