Word: soaps
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Dates: during 1930-1939
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...soap-saving rubber jacket in which to enclose a cake of soap, exposing only one side of the cake...
...with census-taking in Russia is that the peasants are census-shy. In the days of the Tsar they fled from or fought with census officials, fearing that their women were about to be carried off or that all the aged and feeble were going to be boiled in soap. Today their fears are less fantastic, more shrewd: they consider counting noses just another way of picking victims for purges, taxation, the army...
...made motion pictures of pigeons, humming birds and even houseflies in flight; of lamp bulbs breaking under hammer blows; of craters formed on a liquid surface by a falling drop of milk; of soap bubbles breaking; of falling cats twisting in mid-air to land on their feet...
...plants, insects, geography, history. They observe families of mice, model in clay, peer through microscopes, take apart models of flowers under the supervision of adult "docents.''* Patrons may borrow exhibits to take home. Only rule is that they must handle them with clean hands. The museum provides soap and water...
Pure science gave way to practical technology when one of Dr. Langmuir's coworkers, Dr. Katharine Burr Blodgett, found that a layer of transparent liquid soap, with a thickness of one-quarter the average wavelength of white light (about 4/1,000,000 in.), made the glass to all intents and purposes invisible. Reason: glass is visible because of the light reflected from its surface; with a soap film there are two reflections, one from the glass and one from the soap; by spacing the two surfaces properly it is possible to get the "crest" of a light wave bouncing...