By US law, exit signs in buildings must be one of what two colors?

More Questions:

In what year did Ford first offer bucket seats on its automobiles?

In what country would you find "The Strand Arcade', a covered shopping destination?

What event in a decathlon takes the athletes to the greatest height?

The person who invented machine-spun cotton candy was what kind of a doctor?

Which building houses the world's biggest four-faced chiming clock?

What was unusual about Dizzy Gillespie's trumpet?

The city of Muskogee is located in which US state?

The first integral of acceleration gives us what?

Which TV show features a character nicknamed Sweet Dee?

Who directed the movie "Aliens"?

What A-Team cast member was once a bodyguard for Muhammad Ali and Leon Spinks?

Rogers is the last name of which Scooby-Doo character?

What year did General Sherman order Atlanta be burned?

Who was assassinated by Ramon Mercader?

Calypso, cattleya and laelia are types of which flowering plant?