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SciShow
The Baffling Viruses That Infect... Other Viruses
Scientists have discovered viruses that infect viruses... virusception, if you will. Does this mean viruses qualify as life yet? Or are they still hanging out in the misfits drawer with sporks and Pluto?
Khan Academy
Khan Academy: Molecular Genetics: Polymerase Chain Reaction (Pcr)
Introduction to PCR (polymerase chain reaction). [9:53]