Word: detectable
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Precisely at nine o'clock every morning a trim but stooped figure enters the Wigglesworth Gate and proceeds towards the west end of the Yard. Now and then the stroller stops to examine a shrub or gaze speculatively at one of the old buildings, and passers-by can detect bits of conversation that pass between the stroller and some invisible colleague. Indeed, at certain points, the figure seems to stop and engage in lengthy discourse with himself, ending abruptly with a nod of decision and a hurried resumption of his path toward Lehman Hall. The early morning boulevardier is Aldrich...
...some immediate applications. Blond, bushy-browed Walter H. Zinn, the discoverer, who looks like a happy Mephistopheles, thinks that neutrons can probably be used like X rays to examine the structure of molecules. Neutrons are light enough to be scattered by hydrogen atoms, which X rays do not detect; hence they can be used to study organic molecules, such as viruses, which mark the difference between living and inanimate matter...
...work with infinite caution, watching instruments which measure the number of free neutrons within the experimental mass. Under some conditions, the chain reaction starts slowly. But sometimes it leaps into violence in a millionth of a second. There is no explosion, no vibration, no sound. No human sense can detect the outburst of deadly radiation. The only warning, which comes too late, is a faint bluish glow. Some experts think it is caused by ionization of the air; others believe it to be an optical illusion telegraphed to the brain by stimulated nerves behind the eyes...
Operating under a contract with the officer of Scientific Research and Development the local laboratory marshalled a staff of 460 persons. including 125 college-trained scientists recruited from all over the united States to play a part in devising instruments for the Navy to detect and sink enemy submarines...
...Work for Congress. Repeatedly, industry did the wildly improbable. For example, G.E. built instruments to detect leaks and tell how fast, and in what quantity, gas was going through the pipes, by merely attaching an instrument to the outside. Time & again, companies were asked to design a machine according to a "mathematical formula which they did not fully understand." Out of this amazing gadgetry have already come scores of new products, or processes, which have nothing to do with atomic power, such as new ways to dehydrate foodstuffs...