Which city is the brightest spot on Earth when seen from outer space?
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Treat a friend to a bite of trivia.
Extra quizzes for you!
History
Test Your Knowledge of American Founding Fathers
Science
Travel the Cosmos! How much do you know about space travel and research?
Science
The Earth's treasures: Jewels, rocks, and metals!
General
Famous symbols and icons! Can you guess what they mean?