Thomas Edison is popularly credited with initiating the practice of saying “Hello” when answering the telephone. His rival Alexander Graham Bell preferred “Ahoy” (as used on ships) as a phone greeting and used it for the rest of his life. The first phone book, published in 1878, instructed users to begin conversations with “a firm and cheery ‘Hulloa.’ ” (To end conversations, it recommended “That is all.”) By 1889 telephone-exchange operators were known as “hello girls.”

According to the Roman biographer Suetonius, the emperor Vespasian declined to use a labor-saving hoist in his construction projects. “To a mechanical engineer who promised to transport some heavy columns to the capitol at small expense, he gave no mean reward for his invention,” Suetonius writes, “but refused to make use of it, saying, ‘You must let me feed my poor commons.’  ”