Word: thunder
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...heavy bolt of lightning hit the Washington Monument. But nobody in the neighborhood heard any clap of thunder. The occurrence was recorded by the National Bureau of Standards as a bolt of thunderless lightning...
...Thunder is the result of a pressure wave caused by the sudden expansion of air created by a quick lightning discharge. All flashes do not release energy with the same speed. ... In some cases the electrical current is built up and released slowly; that is, in one or two tenths of a second as compared to millionths of a second in other discharges. This so-called slow lightning produces no thunder...
...Summer "heat lightning" appears to be noise less, but it is simply the reflection along the horizon of lightning so far away that its thunder is usually not heard...
...perform a physical experiment. With a stream of neutrons (obtainable by subjecting a pinch of beryllium to the emanations of the radioactive gas radon) he bombarded a bit of uranium. While the routine little experiment proceeded all was peace and quiet in the laboratory. There was no crash of thunder, no flash of cataclysmic lightning...
Associate Professor of English at Columbia University, Van Doren is well known as a poet, critic, and editor. He has written studies of Thoreau, Dryden, and Edwin Arlington Robinson. His own books of verse include: "Spring Thunder," "7 P. M.," "Now the Sky," 'A Winter Diary," "The Last Look," and others. He is editor of the "Oxford Book of American Prose," "American Poets 1930-1930," "An Autobiography of America," and "An Anthology of World Poetry...