Leonardo da Vinci's To-Do List, Circa 1490

• Get the master of arithmetic to show you how to square a triangle.
• Ask Maestro Antonio how mortars are positioned on bastions by day or night.
• Ask about the measurement of the sun promised me by Maestro Giovanni Francese. 
• Find a master of hydraulics and get him to tell you how to repair a lock, canal and mill in the Lombard manner.
• Draw Milan. 

Leonard Da Vinci would carry around a notebook, where he would write and draw anything that moved him. "It is useful," Leonardo once wrote, to “constantly observe, note, and consider." Buried in one of these books, dating back to around the 1490s, is a to-do list.

From Open Culture 

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