Miscellany

Before the entire palette of modern mathematical notation existed, Johannes Kepler relied on musical notation to describe the planets’ rotation around the sun in his Harmonies of the World, published in 1619. The plus and minus signs were introduced in print in 1489 by Johann Widman, and the equal sign in 1557 by Robert Recorde, but the multiplication sign (×) was not introduced until 1631, by William Oughtred; modern exponential notation in 1637, by René Descartes; and the obelus (÷) to indicate division in 1659, by Johann Rahn.

Miscellany

In 1891 Erik Weisz began using the stage name Harry Houdini—the first name deriving from his nickname “Ehrie” and the surname from the great French magician Jean-Eugène Robert-Houdin, who himself had taken the surname from his wife, Josephe Cecile Eglantine Houdin, in order, he wrote, “to distinguish me from my numerous homonyms.”

Miscellany

A winner of the Nobel Prize in Economics, Paul Krugman wrote in 1998, “The growth of the Internet will slow drastically, as the flaw in ‘Metcalfe’s law’—which states that the number of potential connections in a network is proportional to the square of the number of participants—becomes apparent: most people have nothing to say to each other! By 2005 or so, it will become clear that the Internet’s impact on the economy has been no greater than the fax machine’s.”

Miscellany

A review of the sitcom The Hank McCune Show in a 1950 issue of Variety described the first known use of a laugh track on TV: “Although the show is lensed on film without a studio audience, there are chuckles and yucks dubbed in. Whether this induces a jovial mood in home viewers is still to be determined, but the practice may have unlimited possibilities if it’s spread to include canned peals of hilarity, thunderous ovations, and gasps of sympathy.”

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