In motor racing, what does a yellow flag mean?

More Questions:

What Ayn Rand novel opens with the question: "Who is John Galt?"?

What surname for John in "The Importance of Being Earnest" did Oscar Wilde take from the seaside town he vacationed at?

What novel won John Steinbeck a Pulitzer Prize in 1940?

Which US state is the Evergreen State?

What ore is the primary source of Aluminium?

Glen Frey and Don Henley were members of which band?

In the TV show "The Simpsons', who is Lisa's teacher?

What is the name of the sarcastic housekeeper on "Two and a Half Men"?

Which director was responsible for four of the highest grossing films of the 1980s?

In Disney's "Dumbo', Timothy the mouse tricks Dumbo into flying with what?

Who recorded the albums "Cuts Both Ways', and "Into The Light"?

Which US president was nicknamed "His Rotundity"?

In which war was the "Battle of Ramillies"?

Billed as "The Crime of the Century', in which US city did the Great Brink's Robbery take place, in 1950?

Who wrote "The Rose Tattoo"?