I wish I could have gone to Maker Faire Africa! It was held in Ghana's capital, Accra a couple of weeks ago. Paul Karikari's "electric cream heater" is interesting -- you stir aluminum shavings and aluminum powder into some kind of cream and it heats up. (Thanks, Daniel!)
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.