Which country is the largest by land area in the world?

The Mona Lisa painting is displayed in which museum?

The speed of light in a vacuum is approximately how many kilometers per second?

Who is credited with discovering penicillin?

Which country is home to Machu Picchu?

The World Trade Organization primarily deals with which of the following?

The human eye's ability to detect color is due to which cells?

Which is the driest desert in the world?

Which gas makes up the majority of Earth's atmosphere?

The Colosseum, a famous ancient amphitheater, is located in which city?

The Berlin-based organization NATO stands for what?