brain exercise of the day brought to you by brainfuel.
background: This is a puzzle that was first shown to me in the mid 1980s and ever since then I’ve shown [it] to friends and family. It’s tricky, but given 10 minutes you should be able to figure it out. There are seven nails that balance on top of the 8th nail, and you cannot use glue or any other device to balance.
I wasn’t born until the late 1980’s and I have 10 nails to balance. I guess things change over time. This is my work day. I love it.