Willem Einthoven won a Nobel Prize for his string galvanometer, which led to which device used to diagnose heart disease?

Which greeting card company has a visitors center and museum in Kansas City, Missouri? Which comedian was Lou Costello's straight-man partner in a famous comedy team? Smooth-leaf, savoy and semi-savoy are varieties of which leafy green, whose crinkled leaves often need washing to remov… While under indictment for murder, which vice president gave a famous farewell address to the Senate in 1805? William Hazlitt said of which "Ivanhoe" author, "His worst is better than any other person's best"? Which surname is shared by "Gone with the Wind" author Margaret and pioneering astronomer Maria? Which form of Chinese, the basis of the country's standard language, has more native speakers than any other language? Which convenience store chain, named for its original opening hours, began trading on the NYSE in July 2000 under the s…