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A cryotron unit has to be immersed at all times in a bath of liquid helium at a temperature of four-point-two degrees absolute. It is obviously much easier and much cheaper to keep several thousand gallons of helium at that temperature if the surrounding temperature is at two hundred thirty-three absolute than if it is up around two hundred ninety or three hundred.
I figure that's either a four-point-two or a five-point-nine-inch high-explosive Hun. An' there's another o' the dose from the same bottle, an' about a hundred yards this way along the road. I dunno how their high-explosive will mix wi' ours, but if they get one direct hit on a wagon we'll know all about it pretty quick.
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