Word: xenon
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Dates: during 1940-1949
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...interests were scientific. At 17 he built and flew a glider. At 18 he received the rare honor of working in the laboratory of the great chemist Sir William Ramsay. At 22 he read a science paper before the Royal Society (title: The Critical Constants and Orthobaric Densities of Xenon). Soon after the outbreak of World War I, young Cripps was recalled from driving a truck in France, rose to be assistant superintendent of "the largest explosives factory in the British Empire...
...afterglow of the gases they caught in a spectroscope. They found the colors to be not only those of excited oxygen and nitrogen, the most plentiful components of the air, but also of helium, which makes up only .0005% of the atmosphere and is exceeded in scarcity only by xenon. Conclusion: there is probably lots of helium in the upper atmosphere...