Answer by Cultor1337. Confidence votes 1. There are many who say that the smartest man to have ever lived was Albert Einstein. He is certainly one of the most famous of the great thinkers and his intellect contributed massively to the advancement of science.
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Definition of PCR (polymerase chain reaction) 1  Quiz: What Causes Tooth Decay?  PCR (polymerase chain reaction): PCR (polymerase chain reaction) is a technique in molecular genetics that permits the analysis of any short sequence of DNA (or RNA) even in samples containing only minute quantities of DNA or RNA. PCR is used to reproduce (amplify) selected sections of DNA or RNA for analysis.