Ten years ago: A gunman opened fire, killing six people at a Sikh temple near Milwaukee before shooting himself dead during an exchange of fire with one of the first officers to respond. The robotic explorer Curiosity blazed through the pink skies of Mars, steering itself to a gentle landing inside a giant crater. Jamaica’s Usain Bolt pulled away from the pack and crossed the finish line to claim consecutive gold medals in the marquee track and field event at the Summer Games in London. Britain’s Andy Murray cruised past Roger Federer 6-2, 6-1, 6-4 in the men’s tennis singles final. Serena and Venus Williams won the women’s doubles title.
Five years ago: The U.N. Security Council unanimously approved tough new sanctions against North Korea for its escalating nuclear and missile programs. Eight-time Olympic gold medalist Usain Bolt finished third in the 100-meter dash at the world track championships in London, which marked his farewell from the sport; the winner was American Justin Gatlin.
One year ago: Richard Trumka, who rose from the coal mines of Pennsylvania to preside over one of the world’s largest labor organizations, the AFL-CIO, died at 72. A Texas appeals court upheld the murder conviction of Amber Guyger, a former Dallas police officer who was sentenced to prison for fatally shooting her neighbor in his home.