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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.

48. In physics, what letter is used to represent the speed of light in a vacuum?

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

a

b

c

d

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