I don't think people really understand how much a billion is. Sure, we know mathematically—a million x 1,000—but we don't truly grasp it. If you started making $1 million a year tomorrow, by the time you died you'd still be more than 900 years away from $1 billion.
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Here's one I remember: A million seconds is about 11 and a half days. A billion seconds is more than 31 years.
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I have not been alive for a billion seconds.
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