“Recent investigations into nearby space have given emphasis to the fact that life on earth is shielded by the atmosphere. Death from ‘meteoritic stroke’ might be a not-uncommon coroner’s verdict if the protective canopy of the atmosphere were not spread above our heads. During the past 13 years I have been engaged in efforts to secure direct measurement of the meteoritic fallout. My samples of meteoritic dust and cosmic spherules have come from the tops of high mountains remote from industrial civilization, and from the bottom of the ocean. The data now show that meteoritic material comes down to earth in much larger quantity (about five million tons per year) than earlier estimates. —Hans Pettersson”
—Scientific American, February 1960
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