What’s the most populated urban area in the world?
What’s the longest any U.S. President has served?
What’s the minimum score in a volleyball set?
What’s the longest muscle in the human body?
What’s the longest river in Europe?
What’s the lost city where Indiana Jones finds the Holy Grail?
What’s the main cause of lung cancer?
What’s the main climate in Russia?
What’s the main element that milk and dairy provide to our body?
What’s the main pair of composers of The Rolling Stones?
What’s the male hormone?
What’s the masculine copulating organ?