Designer labels have a lot of cachet, a principle that's equally true in fashion and physics.
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For years, the ratio of uranium’s two long-lived isotopes, U-235 and U-238, has been considered invariant, despite measurements made in the mid-1970s that hinted otherwise. Now, with improved precision from state-of-the-art instrumentation, researchers at the University of Illinois unequivocally show this ratio actually does vary significantly in Earth materials.
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An international collaboration at the Michigan State University National Superconducting Cyclotron Laboratory (NSCL) has demonstrated a new technique for studying particles traveling at one-third the speed of light. The result, which will be published in Physical Review Letters, opens up new doors to investigating rare isotopes.
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Scientists at the Carnegie Institution's Geophysical Laboratory in collaboration with a physicist at the Chinese University of Hong Kong have discovered that two different physical parameters -pressure and the substitution of different isotopes of oxygen (isotopes are different forms of an element) -have a similar effect on electronic properties of mysterious materials called high-temperature superconductors.
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Satellite and historical records of tropical cyclone events (tropical storms, hurricanes, and typhoons) are too brief to settle the scientific debate over possible links between climate change and hurricane activity.
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Scientists at the Naval Research Laboratory (NRL) have analyzed samples from Comet Wild 2, as part of NASA's Stardust mission, the first solid sample return mission since Apollo.
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