How can you verify the 7 billion number?
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The World Population Clock says 7.8 billion. I would have guessed slightly low and said just over 7 billion.
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How do you verify that number is accurate?
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Barring some remarkable advances and/or intrusions, the number is always going to be approximate. The question becomes what acceptable level of vagueness is close enough for applied use of the number.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Because a book told them so. Yet the cant believe the bible.
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How do you verify this number?
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Not at all.

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