Which country was divided into East and West after World War II?

Which of these gases is primarily responsible for the greenhouse effect?

What is the most common element in the Earth's atmosphere?

What is the boiling point of water in Celcius?

What is the chemical symbol for edible salt?

The Colosseum, a large amphitheater, is located in which city?

Which artist is known for his blue period, with works like "The Old Guitarist"?

In which book does the character of "Willy Wonka" appear?