Have a bad day? Didn’t get the pumpkin spice latte that you ordered? Someone say something mean to you on Facebook? Well, at least you didn’t get smallpox. And you can thank the global smallpox eradication efforts that resulted in the last natural case of smallpox occurring in 1977 and the World Health Organization (WHO) declaring smallpox eradicated in 1980. But new findings in Siberia, Russia, raise concerns that smallpox could actually return.