Some of the best Olympic drama can be found on the high beams or mats. This is the stage where Kerri Strug and Nadia Comaneci became global stars. Any slight wobble or misstep can undo a performance, making gymnastics competitions far from predictable. Butt here are five gymnasts who should find themselves in the medals hunt in London.
Fukushima Daiichi Nuclear Power Plant continues to leak contaminated water into the Pacific Ocean, but it's not the only nuclear plant suffering from radioactive water issues. Taiwan’s First Nuclear Power Plant and the Plutonium Finishing Plant in Hanford, Wash., join Fukushima in grappling with leaking waste water.
Nagasaki bombing: Sixty-eight years ago, the US dropped an atomic bomb on the Japanese city, just three days after the attack on Hiroshima.
Despite - or perhaps because of - strong international pressure, North Korea conducted its most powerful nuclear test to date. Now analysts say that hopes for improved relations are on hold.
Neither Israel nor Hamas has budged on long-held principles that make coexistence difficult and the prospects for lasting peace remote.