By the numbers
Random science
4,000: Distance in miles from the Earth’s surface to its center, a solid ball of iron the size of the moon
100,000: Number of traffic accidents per year caused by lack of sleep
30-40: Percentage of patients who report feeling better after taking placebos
5: Percentage of the universe that is not dark energy (72 percent) or dark matter (23 percent)
6: Feet of tightly cornrowed DNA in a typical human cell
Source: Wired magazine
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