[Video Link] Becky Stern made this video about her cool pulse-sensing headband, which makes a heart-shaped LED array flash in time to your heartbeat. You can build one yourself by following the instructions at Make: Projects. It's also one of many cool "DIY Superhuman" projects that we have in Make Vol 29, which is will hit newsstands soon!
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.