5. A series of explosions on Aug. 12 that originated in a warehouse illegally storing hazardous chemicals in the port city of Tianjin killed 173 people, injured hundreds and left behind post-apocalyptic scenes of destruction. The blasts raised serious questions about the lax enforcement of safety regulations during China's rapid industrialization.
6. Obama scored narrow wins in Ohio, Wisconsin, Iowa, Pennsylvania and New Hampshire - all states that Romney had contested - while the only swing state captured by Romney was North Carolina, according to network projections。