Nail Cushion Saves Thumbs From Hammers

Too many times have my Karate Kid "one-strike-per-nail" experiments gone wrong. This simple device holds your nail in the middle of a piece of plastic with a cross slice that holds a nail but lets the head pass through when you're finished pounding. Brilliant, but the people too busy to hammer carefully don't have time to fumble with gear, either. Plus, we'll make fun of them. [Yanko]