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

More Questions:

What measurement was derived from the rope to which a boat's "chip log" was tied?

Who is painter Pablo Diego Jose Francisco de Paula Juan Nepomuceno Cipriano de la Santisima Trinidad better known as?

Demeter is the goddess of what?

Which literary bear got its name from a London railway station?

Which Russian writer composed "Peter and the Wolf"?

What is the capital of the United Arab Emirates?

Which US state is nicknamed the "Granite State"?

What lake was created in the 1900s when the Colorado River broke through an embankment?

Mariner 9 was the first spacecraft to orbit what other planet?

Approximately how long does it take for sunlight to reach Earth?

Who performed "Bitter Sweet Symphony" with Coldplay at the Live 8 concert?

Who played the blind character in the movie "City Lights"?

Who played Louie De Palma in the TV series "Taxi"?

What was the first name of the cartoon character Mr. Magoo?

Who sent the Spanish Armada to invade England?