Meet blueBook
This is sort of too crazy for words. blueBook is a… Well, it’s like a book that… Actually, I’m going to let Spurgeonblog explain it, since that’s where I first heard of it:
blueBook is an old-school traditional paper book, but printed with electrically conductive ink. Touch a word or picture and your finger completes a circuit, sending a message to a tiny circuit board in the book’s cover, which then transmits a message via Bluetooth to your nearby computer. Voila!, additional information about the selected text or image appears.
Where, exactly, does one purchase “electrically conductive ink,” anyway?