On Dec. 30, 2006, former Iraqi President Saddam Hussein was executed by hanging after being convicted of crimes against humanity by the Iraqi High Tribunal. Hussein was captured in 2003 by U.S. forces while hiding near his hometown of Tikrit.

On April 26, 1986, in the worst nuclear disaster in history, an explosion and fire at the Chernobyl nuclear power plant in Ukraine caused radioactive fallout to begin spewing into the atmosphere. Dozens of people were killed in the immediate aftermath of the disaster, while the long-term death toll from radiation poisoning is believed to number in the thousands.