Liquid nitrogen is alot of fun. Its neat how if you spill it on a table or something it scatters all over in small beads because of the fast change to a gas actually holds the LN2 off the table.
You can actually take some, and put it in your mouth and just blow out smoke. It works on exactly the same principal.
(don't do it with lots, just a small amount, and definatly don't swallow)
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