There was supposed to be an article in the latest MAKE (Fringe, Vol. 9) that Editorial decided to pull at the last minute. It was on building a “Lifter”, a lightweight “craft” that floats through the air using high-voltage to create a lifting/propelling force. After talking to the Advisory Board (on which I sit), it was decided that, even with stern disclaimers, there was just too much risk, of both injury and litigation. But the email discussion about it became so interesting that Mark decided to publish it (the discussion, not the Lifter how-to) as on issue Extra. Here it is on the Makezine website.
BTW: I have several pieces in this issue, a profile of Jake von Slatt and a piece on TokyoFlash.