1) Five hundred begins it, five hundred ends it,
Five in the middle is seen;
First of all letters, the first of all figures,
Take up their stations between.
Join all together, and then you will bring
Before you the name of an eminent king.
2) You are blindfolded and naked in an empty room. You are given a pair of steel bars. One is a bar magnet, the other is not. You will be released if you can tell which is which. You are allowed to touch them together just once.
How can you tell which is the magnet?