Euler and kids
This wasn't from my notes, but rather from the scratch paper I was using to write notes on. The scratch paper was from a draft of a workbook on platonic solids, a section about Euler. The workbook contained some notes in the margin, such as:
Leonard Euler . . . , an 18th century Swiss mathematician . . . loved children and often worked with a baby on his lap, and some of his other children playing around him (he had 13, though 8 of them died while still young).