It was one of the first things I learned when I began making my own soap; I read it in books and on the internet: "Always keep a jug of vinegar on hand when you are working with lye. Vinegar neutralizes lye." Soapers, have you heard this? Do you practice the habit of keeping vinegar nearby when you make your soaps? So did I, until recently, when I read an interesting post on a soap forum, and then decided to research the claim myself.
From deodorant and ketchup, to raising chickens and composting.