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Certain chemical substances, broadly called luminogens, have an inherent ability to emit light. Most fluorescent molecules emit light in solution but lose their emission in the solid state, where the molecules aggregate.
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Between 20 to 30 percent of American adults bite their nails. But you should probably stop to avoid bad bacteria and damaging your body. The post How gross is biting your fingernails?
Since scientists can't drill 2,900 km (1,800 miles) to the boundary between Earth's core and deep mantle, they must use information relayed by seismic waves recorded during earthquakes to study this region. In a new study published in the journal JGR Solid Earth, a group of scientists used deep ...
On Sept. 6, 1947, a V-2 rocket launched from an U. S.