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Parents in the town of LeRoy, NY are not convinced by the diagnosis of conversion disorder to explain the twitching that has afflicted some of the local teenage girls. CBS News correspondent Seth Doane reports.

PCR--the polymerase chain reaction--is a crucial tool. The DNA amplification technique is used in genome sequencing, forensics and the diagnosis of various diseases. To give researchers more genetic material to work with, a PCR instrument repeatedly heats and cools an original biological sample

PCR--the polymerase chain reaction--is a crucial tool. The DNA amplification technique is used in genome sequencing, forensics and the diagnosis of various diseases.