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1) The speed of light is generally rounded down to 186,000 miles per second. In exact terms it is 299,792,458 m)s (metres per second - that is equal to 186, 287.49 miles per second).

2) It takes 8 minutes 17 seconds for light to travel from the Sun's surface to the Earth.

3) October 12th, 1999 was declared "The Day of Six Billion" based on United Nations projections.

4) 10 percent of all human beings ever born are alive at this very moment.

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