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The original was posted on /r/todayilearned by /u/VegemiteSucks on 2023-10-30 15:15:29.

Original Title: TIL of Thomas Fuller, an enslaved African and mental calculator. When asked how many seconds a man has lived in 70 years 17 days & 12 hours, he replied 2,210,500,800. When told he was wrong, Fuller said “massa, you forget de leap year”, which was correct once the seconds of the leap years were added