When you buy a jar of all-natural peanut butter, don't stick it in the pantry. Park it on top of the refrigerator, upside down. Once a day, when you walk by it, say "hello peanut butter", and flip it over.He says he was so pleased with the results, that filed a patent on it: U.S. Patent # 6,325,533.
When you're ready to open it and stir it up, it will be half mixed for you (and not hardened into a frustrating marble block).
I'm thinking someone could make a version of this that used some of the same circuitry and components in the hourglass random number generator project I posted earlier today. The jar of peanut butter would go where the hourglass is. The gadget could either sense the opacity of the oil and flip it when it was no longer translucent, or it could just flip it once or twice a day.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.