Which convenience store chain, named for its original opening hours, began trading on the NYSE in July 2000 under the symbol SE?

Willem Einthoven won a Nobel Prize for his string galvanometer, which led to which device used to diagnose heart diseas… 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? With reinforced hulls, the Coast Guard's Polar class cutters are which specialized vessels? With support from Andrew Jackson, which New Yorker was elected president in 1836? With the dawn of which age did pitchblende, once considered almost worthless, become highly sought after as a source of… Which company's Mindstorms kits let builders create programmable robots, including Star Wars droids?