The Number of the Day: 3,000,000

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One human being's network of neurons, laid end to end, might extend as far as 3,000,000 miles.

Related Link: This week we're pulling Numbers of the Day from the beautiful and fascinating National Geographic Answer Book, which hit stores last Tuesday. You can order your copy from the National Geographic Store.

[See previous Numbers of the Day here.]

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September 27, 2010 - 11:12pm
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