National Geographic: n the latest crisis to strike the Fukushima-Daiichi nuclear power plant in Japan, operator Tokyo Electric Power (TEPCO) has discovered that 300 tons (nearly 72,000 gallons) of highly radioactive water has leaked from a holding tank into the ground over the past month. The development comes on top of TEPCO's admission last month that an estimated 300 tons of radioactive groundwater, which picks up small amounts of contamination when it flows through the damaged reactor buildings, has been leaking...