Mercury is the only metal that's a liquid at room temperature,
and something that I've always wanted to do, was to try making it solid.
To do this, I just have to add some liquid nitrogen to a dish, and wait for it all to
cool down. Now it looks like it's good to go, and I can pour in some of the mercury.
This is a few minutes later, and it's definitely solid.
I really have no idea what to do with it though. and I think it might be cool
to just melt it again.