Homogenized, pasteurized, refrigerated, U.S. milk is an eminently safe beverage. But U.S. laboratories are hard at work trying to make it even safer. In a cold war world, scientists must somehow learn how to extract the radioactive strontium 90 that is showered down on pasture grass from atmospheric nuclear tests. At present, U.S. cows do not take in enough strontium to make their milk dangerous, but testing may well continue; the problem may well get worse.
One promising solution makes use of ion exchange resins, bits of plasticlike material with metallic atoms built into...
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