Before watching the following video, consider how you'd balance 11 nails on top of a single nail in a board. Think you could do it? Check out this guy's solution:
Hit play or go to Link [YouTube] to watch. I would have probably spent hours trying to balance them end on end.
Oh, haha. So that's how that worked. I was at Science World 3 days ago where there are lots of puzzles like this one along with many neat science gadgets, games and displays. I saw this puzzle and was completely baffled.