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The time has come for humanity to journey to Mars. We’re ready. 46)Though Mars is distant, we are...

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The penny which doubles itself every day for one month.  The time span of at least two million years in human history.  An illustration of the exponential growth rate given by the author.  The large amount of money you would luckily make after the fourth week.  
has come; have come   have come; has come   has come; has come   have come; have come  
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