Video: A 30,000-Year-Old Siberian Virus Has Come Back to Life

Permafrost Siberia
An aerial view shows Thermokarst lakes outside the town of Chersky in northeast Siberia August 28, 2007. Dmitry Solovyov/Reuters

A 30,000-year-old giant virus was found frozen in Siberian permafrost. Once thawed, it again became infectious, but it's not dangerous to humans.