A predicted flip flop in Earth's magnetic field could happen sooner than scientists thought.
Some 300 tonnes of radioactive water is believed to have leaked from a tank at Japan's crippled nuclear plant.
Dark lightning, flashes of gamma rays that occur at altitudes in which commercial aircraft fly, doesnâ€™t produce much light, but it does produce radiation.
An unexpected temperature spike this week in a nuclear reactor at the embattled Fukushima plant, has required emergency countermeasures.
Radiation-induced mutations in butterflies in Japan are getting worse with succeeding generations.