Clock is based on a single atom

It may not be as accurate as today's atomic clocks, but it's an awful lot simpler in concept: a new way of measuring time based on the mass of an atom.

Radioactivity in Japanese waters thousands of times higher than normal

With recent reports that there have been further radioactive leaks from the Fukushima nuclear power plants, a new study has assessed the level of radioactivity in the ocean in the first months after the disaster.