He pointed. On a very slowly moving band a rack-full of test-tubes was entering a large metal box， another， rack-full was emerging. Machinery faintly purred. It took eight minutes for the tubes to go ...
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He pointed. On a very slowly moving band a rack-full of test-tubes was entering a large metal box， another， rack-full was emerging. Machinery faintly purred. It took eight minutes for the tubes to go ...