What if you have a need for liquid nitrogen, but you do not wish to simply order it from a local supplier? In that case you can build your very own pulse tube cryocooler, as [Hyperspace Pirate] is in ...

A cryocooler might sound fancy, but it just gets really cold. What I think is really cool about it thought, is that you can actually use it to turn air into a liquid. Australia to send ex-fighter ...