Half the truth: verifying quotes
A very nice research job by Politifact’s Steve Contorno and the APS’s Roy Goodman, detailed in this Politifact article: congratulations to all. Some Non-Bogus Quotes An Ounce of Prevention is worth a Pound of Cure: both this 1735 article and a 1750 letter. See Also Familiar (Mis)Quotations by a kindred soul at Johns Hopkins.