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The coolest (sorry) liquid nitrogen experiment I ever
saw was:
Fill the tray part of a small matchbox with mercury.
Stick an ordinary wooden ruler into the mercury.
Pour the LN over the matchbox.
Pound nail into board with the resulting hammer.
Of course, you probably have to get EPA clearance
for the mercury these days. Bummer.
By the way, liquid nitrogen ice cream has been a staple at
the Minnesota State Fair for the past two years. It's by far
the best ice cream ever.
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