Danish personnel suffering from influenza occupy beds in temporary sick quarters set up in a gymnasium at Copenhagen's naval shipyard to handle the large amount of patients on Oct. 12, 1957. On Wednesday, April 13, 2005, scientists around the world were scrambling to prevent the possibility of a pandemic after a nearly 50-year-old killer influenza virus was sent to thousands of labs, a decision that one researcher described as "unwise." (AP Photo)