Transparent Post-Its let you see what you're editing

It's not often you see an innovative twist on an already good idea, but 3M's done it with their transparent Post-It notes. Called Sheer Colors, the see-through notes have a host of uses — from highlighting borrowed books to marking up photographs without actually defacing them. They also might be a decent choice to cover the eyeholes in your Iron Man mask.

3M, via Cool Hunting