Word: nucleus
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Dates: during 1980-1989
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Tritium, an isotope of hydrogen that contains two neutrons and a proton in its nucleus, occurs naturally in minute quantities in raindrops and groundwater. But the radioactive gas took on strategic importance in 1952, when the U.S. exploded its first hydrogen bomb. That explosion demonstrated the destructive force that can be released when tritium fuses with deuterium, another hydrogen isotope, to yield helium and a burst of nuclear energy. Today, tritium is used both to enhance the power of atom bombs and in the trigger mechanism of the far more destructive H-bomb. Because it decays at the rate...
Phoenix's Kevin Johnson is one of the best point guards in the league, and Tom Chambers and Eddie Johnson provide a solid nucleus for a potential championship team...
...they are not animal, vegetable and mineral. In fact, all the matter most people are familiar with can be subsumed within one family of particles. This family includes the common electron, which hovers around the nucleus of the atom; the "up" and "down" varieties of quarks, now known to be the constituents of protons and neutrons; and an obscure particle known as the electron neutrino. Neutrinos have no charge and no measured mass, yet are thought to be among the most abundant particles in the universe...
Battery Park City may be the ultimate in recycling: 24 acres of earth that were scooped out to build the giant World Trade Center a block away were dumped on the marshy edge of the Hudson River, forming the nucleus of a new 92-acre chunk of land. And -- hallelujah! -- the river, which most New Yorkers rarely glimpse, has been given back to the people, as Battery Park City embraces the wide and wonderful Hudson. The shore has been beribboned by a sculpture-studded esplanade, a mile-long stroll leading to the South Cove. There, grasses and boulders are untamed...
...Ramsey's increased precision that enabled scientists to use the atomic clock for the official measurement of world time. In 1967, his method was used to redefine the second as the length of time it takes a cesium nucleus to rotate 9,192,631,770 times...