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The speed of light in a vacuum is approximately how many kilometers per second?
The human eye's ability to detect color is due to which cells?
Which country is the largest by land area in the world?
Which gas makes up the majority of Earth's atmosphere?
The Mona Lisa painting is displayed in which museum?
The Berlin-based organization NATO stands for what?
Who is credited with discovering penicillin?
Which country is known for the invention of paper?
The World Trade Organization primarily deals with which of the following?
The largest mammal in the world is which of the following?