Jeff Simmermon posted this 1980s ad for a substance called Cube Lube, "an incredible lubricant specially formulated for the cube and other mind-boggling puzzles that move."
Cube Lube (And I Am Not Lying)
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.