Vast stretches of permafrost are melting as the Earth's polar regions warm, thawing ancient viruses and bacteria that had remained frozen for tens of thousands of years.Behind the lurid headlines about "zombie viruses," there's some fascinating science - and a warning.Last month, scientists announced they'd taken a sample of tundra from Siberia, extracted a virus that had been frozen for 50,000 years, and showed it was still capable of infecting its normal host - amoebas.
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