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Are you scientifically literate? Take our quiz

You may have an opinion on climate change, evolution education, stem-cell research, and science funding. But do you have the facts to back up your opinion? This quiz will test your basic scientific literacy.

William & Mary professor Elizabeth Harbron displays vials with merocyanine and rhodamine dye in her lab in Williamsburg, Va.
Steve Helber/AP
Question 1 of 50

1. Composing about 78 percent of the air at sea level, what is the most common gas in the Earth's atmosphere?

Carbon dioxide

Oxygen

Nitrogen

Hydrogen

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