Word: developer
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Dates: during 1940-1949
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...develop the atomic bomb cost the U.S. $2 billion spread over three years. That was small potatoes-roughly equivalent to two weeks' U.S. war cost. Definitely, the economics of the atomic bomb did not limit it to the top powers...
Would the fact that the U.S. had an atomic bomb now dispose the Russians to go further toward genuine collective security and a more democratic charter? Would the possibility that some other nation might yet develop a more terrible atomic bomb persuade the U.S. to go further in the same direction...
This "chain reaction," which the Manhattan District now had to develop, did not happen naturally, chiefly because only one part in 140 of ordinary uranium is U-235. Most of the rest is another isotope, U-238-which, instead of splitting like U-235, absorbs the newborn neutrons with the result that the atomic flame goes out like a match in wet excelsior...
...these uses and countless others, an amazing variety of radars have been developed. There are "early warning" radars which can pick up a plane more than 100 miles away and show how fast and in what direction it is flying; fire-control radars which automatically aim and fire a machine gun or antiaircraft gun more accurately than a human gunner; special radars that provide eyes for night fighter pilots, guide planes to blind landings (called G.C.A., "Ground-Controlled Approach"), observe stratospheric weather balloons and detect storms. Engineers think that it may even be possible some day to develop a missile...
Private industrial research, President Conant claims, tends to keep by-products of the process used in reaching the "chosen target" to a minimum. Under such methods, there is little time, he indicates, to follow up the side-tracks which unexpectedly develop into such discoveries as penicillin...