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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.

40. The lowercase of what letter of the Greek alphabet is used to denote diverse phenomena such as the photon, the third angle in a triangle, the heat capacity ratio in thermodynamics, a type of high frequency electromagnetic radiation?

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

alpha

beta

gamma

delta

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