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Scientists have discovered a 30,000 year old virus in samples of melted Siberian permafrost. Mollivirus sibericum, was assumed to be dormant but was easily re-activated suggesting it and other similar viruses may pose a huge threat to humans in the near future. Scientist Chantal Abergel explains this unique discovery... (Photo: Air bubbles are seen in a puddle of surface melt in the glacial ice sheet Credit: Joe Raedle/Getty Images)