TIL children were most prone to lead poisoning because lead chips and toys with lead dust tasted "sweet".
TIL about Kirk Allen, a senior member of the U.S. military who believed a series of popular sci-fi novels, in which he shared the protagonist's name, were his biography. He created full-color maps, sketches, and written stories, to fill in omitted details from his own recollection.
TIL Thomas Jefferson was so impressed by macaroni and cheese during a visit to Paris that he wrote down the recipe and instructions on pasta extrusion, imported a pasta maker, macaroni, Parmesan, and made it at his home. He served it at a state dinner in 1802.