It’s a really cool science puzzle… balancing a pile of nails on the head of a stationary nail. I’ve always liked this puzzle because it gets kids thinking about the center of gravity. In this video, we substituted the small, table-top version of the set-up for a dozen large nails – like the kind you would use for landscaping. Mark Koebrich was surprised by the solution, but I was surprised to see how much he liked the dumb balancing bird demo. Just goes to show you that you never know which ideas are going to stick.

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