Word: supercold
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Dates: during 1990-1999
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...such supercold temperatures, scientists believe, matter may start to exhibit bizarre and interesting new properties. Certainly, cold atoms can be trapped and manipulated in a variety of cunning ways. The fountains created by Chu, for example, are enabling scientists to observe atoms in free fall and thus measure gravitational force with unprecedented accuracy. Fountains are also helping scientists measure the oscillations of cesium atoms more precisely than ever before, and cesium atoms are to atomic clocks -- the world's most precise timepieces -- what quartz crystals are to wristwatches...