An Iraqi father remembers the day in September 2007 when US private security guards opened fire on civilians in central Baghdad killing 17 people, including his 9-year-old son. Plus, former president Ellen Johnson Sirleaf on negotiating the cancellation of Liberia's massive debt; the chaos of Florida's 'hanging chads' in the 2000 US elections; when Nelson Mandela visited Detroit; and the end of the Galileo space project.

Photo: An Iraqi looks at a burnt car on the site where Blackwater guards opened fire on civilians in Baghdad on 16 September 2007 (Credit ALI YUSSEF/AFP via Getty Images)