Science: Holey Smoke

If, a year or so from now, skywriting airplanes fill the heavens over the U.S. with "Buy Nutsies" in mile-high letters of long-lasting, bright-colored smoke, the credit (such as it is) will go to Betty Lou Raskin. 36, a research associate at Baltimore's Johns Hopkins University. This week, at a Washington, D.C.. meeting of the American Society of Plastic Engineers, Miss Raskin unveiled the skywriters' dream weapon: "holey smoke" particles which are made of foam plastic and are so gossamer light that they hardly fall at all.

Most artificial smokes, Miss Raskin explained, are made of fairly heavy materials such as phosphorus...

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