Scientists working in the Arctic circle over the past few decades have unearthed several massive viruses that some say could be re-awakened if the permafrost that imprisons them dissolves. Recently, some researchers have suggested that these enormous viruses could thaw out, escape, and make lots of people sick. It sounds like something out of a 1990s horror film. But you shouldn't get too concerned — at least not yet. The likelihood that these viruses will break free and sicken humans is slim.