Word: traces
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Like many other spectacular discoveries, Anders' finding was serendipitous. He and his co-workers had simply hoped to elaborate on the Alvarez hypothesis by detecting trace amounts of rare noble gases, like neon and xenon, in the layer of Cretaceous clay deposited during roughly the same period that the dinosaurs became extinct. They were seeking to identify the nature of the object responsible for the impact. Because noble gases collect in carbon particles, the scientists isolated the carbon in Cretaceous sediment taken from Denmark, Spain and New Zealand. To their surprise, all three samples contained carbon that had been deposited...
...recent disappearance remains unresolved. Vladimir Alexandrov, a prominent Soviet physicist, vanished without a trace while visiting Madrid late last March. Alexandrov originated the mathematical model for the nuclear winter theory, which holds that the smoke and dust hurled into the atmosphere by a full-scale nuclear war between the superpowers would block the sun's rays for weeks, causing the earth's temperature to plummet. The mystery of his disappearance has been compounded by the suspicions of some Western scientists that the nuclear winter scenario was promoted by Moscow to give antinuclear groups in the U.S. and Europe some fresh...
Hundreds of citizens flocked to medical clinics to donate blood, while others contributed food, clothing and blankets and offered shelter to the homeless. In the meantime the rescuers, some wearing bright orange vests and blue face masks, labored to trace cries for help amid twisted girders and broken blocks of concrete. When rescuers found survivors, they passed them in a human chain from the top of fallen buildings to the street and into waiting ambulances...
...Corsica, who were supplied with explosives by the support teams. They were said to have attached two mines to the Rainbow Warrior, first a smaller charge to force any occupants off the ship, and then a second one to sink the craft. The two frogmen disappeared without a trace...
...grapplings with beauty become fairly obscure among Pete's serious-if-weird musings on God, alcohol and drug abuse, getting laid, and being famous, which contain not a trace of the attractive, let alone the beautiful...