A fun thing you can do with these is demonstrate para-magnetic materials.
These metals are not attracted by magnets but the metals (like silver) do not like to pass through a magnetic field.
Take a silver coin and try to rub it around on the magnet and it becomes hard to move.
This is one of the tests you can perform on silver coins to test if it is a fake. It the coin sticks to the magnet it’s obviously fake or if it does not resist moving through the magnetic field it’s fake. Many fakes are made primarily of nickle which is not para-magnetic. If the fake has some silver it will resist movement across the magnet but it will be obvious it’s not pure silver since it moves so much easier than a real coin.
Aluminum in an MRI machine