While preparing for move to a new location, researchers at the US National Institutes of Health discovered a cardboard box inside a storage room refrigerator. To their horror, the vials inside were labeled "variola" — the name of the virus that causes smallpox.
The virus that was supposed to have been eradicated in 1980 doesn't seem to want to go away. It currently exists in only two places, at the Center for Disease Control in Atlanta, and at the Russian State Research Center of Viology and Biotechnology in Novosibrisk. Recently, scientists couldn't make up their minds about whether or not they should destroy these remaining samples, arguing that crucial questions about the virus remain unanswered.