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TIL that Marjorie Fleming (1803–1811), a Scottish child writer and poet admired by Robert Louis Stevenson, is notable for a diary she kept during the last 18 months of her life. She died of meningitis a month short of her ninth birthday. Her manuscripts are held in the National Library of Scotland.

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jNRXj TIL about Nannie Doss, an American serial killer responsible for the deaths of eleven people between the 1920s and 1954. Also referred to as the "Giggling Granny". It was revealed that she had killed four husbands, two children, her two sisters, her mother, a grandson, and a mother-in-law.
4XQAo TIL N.Rothschild had early info that Napoleon lost at Waterloo, and used that info at the London stock exchange: instead of buying, he sold shares en masse, making people think that Napoleon had won and plummeting the stocks. At the last minute he started buying at low prices, thus making a fortune
XdlQ TIL of the Dunning–Kruger effect, a phenomenon in which an incompetent person is too incompetent to understand his own incompetence
GAa5Q TIL: World population (estimated) did not rise for a few millennia after the Neolithic revolution.
OGQ84 TIL the piano part in BTO's "Taking' Care of Business" was peformed by a pizza delivery guy who happened to be in the studio.