Armed with a high-powered rifle, a tester for the biggest U. S. explosives company walked a few paces, wheeled, aimed, fired. The bullet zipped into a two-foot cylinder of whitish stuff resembling caked salt. Nothing happened. A 50-lb. trip-hammer crashed down on another cylinder. Nothing happened. A man attacked another piece of the substance with a blowtorch. It simply sizzled. Red-hot irons bored holes in other pieces and still nothing happened. Other lumps were dropped into furnaces. They disintegrated harmlessly. Testers tried in vain to make the stuff explode with blasting caps. But...
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