Which leader reportedly said in 1965, "Let's cool it, brothers," just before he was shot?

What word names a sneaker and is also slang for a private investigator? What is a snide, self-satisfied smile called? Which of Snow White's seven dwarfs has a seven-letter name starting with B? Which of Snow White's dwarfs has a name that also refers to a healer? Which publisher, whose name is still on magazines, published Mademoiselle and Glamour starting in the 1930s? What word names a soda fountain server, whether or not he's foolish? What is a soft, elastic mixture of flour and water called? What is a soft boot made of reindeer or seal skin called?