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#Mental Calculation

Yusnier Viera, the Cuban-American mental calculator known as the Human Calendar.

#Mental Calculation

Yusnier Viera Calculated 132 Calendar Dates in One Minute

Alexis Lemaire standing beside a chalkboard filled with digits from a mental root calculation.

#Mental Calculation

Alexis Lemaire Found the 13th Root of a 200-Digit Number in 70 Seconds