Word: mn
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Dates: during 1950-1959
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...with type A. But that decisively acquits the 60% of men who have B, AB, or O blood.* Besides the ABO grouping of red cells, blood varies according to whether it contains a factor M (present in 30% of the population), N (in 20%), or both, MN (in 50%). Blood also is classified according to which of the 27 subgroups of the Rh factor it belongs. Even with the tests' present limitations, Dr. Barnes proudly reported, in 39 cases this year he has exonerated eight accused men by the test itself, while six more men went free because...
...clean in one way and dirty in another. In Science, William H. Shipman and other scientists from the Naval Radiological Defense Laboratory, San Francisco, tell how they found large quantities of radioactive manganese 54 in the fallout from last year's thermonuclear tests at Eniwetok. Since Mn-54 is not a fission product, they concluded that it was formed when free neutrons from the explosion combined with iron or ordinary manganese, presumably in the bomb's structure. Figuring back, they estimated that "megacurie quantities" were produced...
Since each megacurie is roughly as potent as 2,200 Ibs. of pure radium, this is a large amount of radioactivity. Mn-54 has a rather long half life, 291 days, and since it is absorbed by living organisms, the Navy's safety men have added it to their list of dangerous fallout isotopes. They are now looking for plants and animals that may pick it up as it floats around the earth, and concentrate it in their tissues. They already know one plant, tea. that is avid for manganese and may concentrate the radioactive kind...