Leonardo da Vinci
painter · engineer · Florence · Milan · 1452–1519
He left far more notebooks than paintings: some seven thousand pages survive, in a hand that can be read only in a mirror.
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late 15th century
As a day well spent procures a happy sleep, so a life well employed procures a happy death.From his notebooks · in place of the original: the English translation edited by J. P. Richter (1883)
late 15th century
Just as iron rusts unless it is used, and water putrifies or, in cold, turns to ice, so our intellect spoils unless it is kept in use.From his notebooks · in place of the original: the English translation edited by J. P. Richter (1883)
1 in 100 Billion · The social network of those who came before us