The Acoustic Laser

Also called, The Hilsch Tube

Although it's no more efficient than freon-based refridgeration, it's much smaller, costs a lot less, and should therefore be cheaper.

So why isn't it in use?

The next time I buy a refrigerator, I've a mind to build one of these devices and hook it to a styrofoam cooler, instead.

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I am Mugs, of the Alien clan of Usa, Nordamerica, a Terran, of Sol.

Mine: "Perception isn't reality. It's merely an abstraction thereof, and quite often not a very good one at that."

Heinlein's: "Staying young requires the unceasing cultivation of the ability to unlearn old falsehoods." "Freedom begins when you tell Ms. Grundy to go fly a kite."