Leonardo wrote in "mirror script", which is the practice of reversing one's handwriting so it can only be read in a mirror

Leonardo Da Vinci was the illegitimate son of a wealthy Florentine notary

Leonardo Da Vinci had no formal education

Leonardo Da Vinci was a vegetarian

Leonardo Da Vinci could draw with one hand and write with the other hand at the same time

None of Leonardo Da Vinci's writings were published during his lifetime