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Letters Darwin sent (black) and received (red), and letters Einstein sent (green) and received (blue). During the last 30 years of his life, Einstein wrote a letter a day (note the dip during WWII). Credit: Journal Nature

Letters Darwin sent (black) and received (red), and letters Einstein sent (green) and received (blue). During the last 30 years of his life, Einstein wrote a letter a day (note the dip during WWII). Credit: Journal Nature

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