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December 10 2009
Visualizing Prime Numbers
This image tells you all the factors for each number. Wherever you have only 2 circles intersecting the horizontal axis at their right quadrants, you have a prime number! The green vertical lines show the locations of the prime numbers.
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Visualizing empires in decline
This video timeline by Bryan Campen covers the last 200 years of major world powers.
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November 02 2009
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