Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Project Grab Bag was an air sampling program conducted in the United States for the monitoring in the stratosphere of above-ground nuclear weapons testing in the Soviet Union. The objective of the Grab Bag program was to develop a unmanned high-altitude balloon-borne system that would collect air samples at an altitude of typically 80,000 feet and return them to earth for analyses. The air samples were analyzed for the presence of specific isotopes of krypton and xenon, unambiguous markers of fission reactions. These short-lived isotopes are created in the fission process and carried high into the atmosphere by the fireball where they will remain for some days. The air sampling system was developed by the Balloons and Meteorological Systems group at General Mills, Inc. in Minneapolis, Minnesota, using large balloons fabricated of thin polyethylene film.

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