This is a picture of Ikea's "Optimal" shopping hours. At first glance, it seems like a good idea, and a good chart to follow. If you actually try to figure it out though, it makes no sense. It appears to be a 12 hour clock, but it also appears to reference 24 hour time. What?Link
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.