Interesting fact: When this photo of Earth was taken from the Moon on Dec. 13, 1972, the world's human population was 3.8 billion. 45 years later it has doubled to 7.6 billion. It is expected to reach nearly 10 billion by 2050.

Interesting fact: When this photo of Earth was taken from the Moon on Dec. 13, 1972, the world's human population was 3.8 billion. 45 years later it has doubled to 7.6 billion. It is expected to reach nearly 10 billion by 2050.

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