At the American Physical Society Convention in Seattle last week, Dr. Marcel Schein of the University of Chicago had news to make even a sensation-jaded physicist draw a sharp breath. Last winter, he reported, he and his assistants tied a pack of photographic plates to a balloon, sent them up to 100,000 ft. over Texas to be exposed to the powerful primary cosmic rays that bombard the top of the atmosphere. Later, studying the plates in the laboratory, Dr. Schein got more and more excited as he followed a peculiar ray track through the...
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