Science: Snow-Making

One chilly morning last week, Vincent J. Schaefer of General Electric climbed into a light plane at Schenectady's airport. While his boss, Nobel Prizewinner Irving Langmuir, watched from a control tower, Schaefer told the pilot to fly to a cloud 50 miles away.

As the plane plunged into the cloud, Schaefer radioed back to Dr. Langmuir that he was about to begin. Then he carefully scattered six pounds of dry-ice pellets through the cloud in a belt three miles long. In two minutes flat the poisoned cloud was writhing with agonies so enormous...

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