On laundry care labels, a crossed-out triangle, sometimes shown with the letters "Cl," warns you not to use what?

The Seventh Amendment to the U.S. Constitution guarantees which right? The state house in which city is where George Washington resigned his commission as commander-in-chief in 1783? The story of which dancer, who became a French citizen in 1937, was made into a TV movie starring Lynn Whitfield? The Sun is about 333,000 times as massive as Earth and about 1,047 times as massive as which planet? Tales by which German Romantic author inspired many operas, including Busoni's "Die Brautwahl"? Cephalopod arms bear which gripping structures, whose name is also slang for the gullible customers P.T. Barnum suppose… Legend says the tiered steeple of Christopher Wren's St. Bride's Church in London inspired which festive item? In which 1976 Best Picture winner does the title boxer gulp raw eggs and punch sides of beef in a meat locker?