Word: nuclei
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Dates: during 1960-1969
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...would be "a grievous and dangerous delusion to believe all our problems would be solved if we withdrew from Viet Nam, or from Asia, or from anywhere else." From Latin America, New York Times Columnist C. L. Sulzberger wrote last week: "Our humiliation in Viet Nam would persuade guerrilla nuclei here of the efficacy of 'national liberation' wars. Our adversaries know, even if we do not, that revolutionary warfare in Viet Nam is directly linked to the fate of South America...
Meteorologists have long tried to make rain and break up hailstorms by seeding clouds with silver iodide or lead iodide. Drifting upward from generators on the ground or fed into the clouds from aircraft, the particles become nuclei around which tiny water droplets can cluster to form larger drops and, eventually, hailstones. If enough nuclei are available, according to theory, they compete so vigorously for the moisture in the cloud that none of the hailstones has a chance to become very large...
Last year, Walker and another colleague discovered what may prove to be an even more sensitive dating method-the measurement of alpha-particle tracks. Uranium nuclei frequently emit an alpha particle. As the particle is expelled, the nucleus recoils. Walker reasoned that "recoil tracks would be there, so I looked for them." He discovered that observable recoil tracks occurred 4,000 times more than fission tracks. When acid etching and track counting are perfected for alpha particles, the method should provide a means of dating infinitesimally small objects and those too young to have accumulated measurable amounts of fission tracks...
...Electric and the Army's Limited War Laboratory, the E63 is based on a phenomenon often demonstrated in high school chemistry classes: if open bottles of ammonia and hydrochloric acid are placed close together, a white cloud of ammonium chloride particles forms above them. These particles serve as nuclei for the condensation of the air's water vapor into tiny, foglike droplets...
...forever destroyed an established scientific concept: that atoms retain their original identity when they form molecules. Instead, he argued, the balance of particles within atoms changes when they become part of molecules; electrons may take up orbital paths around the entire molecule instead of remaining in orbit around atomic nuclei. Virtually all of the significant work in molecular structure that has been done since has been based on Mulliken's theory...