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By Geoff Brumfiel of Nature magazine North Korea may have conducted two covert nuclear weapons tests in 2010, according to a fresh analysis of radioisotope data. The claim has drawn scepticism from some nuclear-weapons experts. [More]

By Geoff Brumfiel of Nature magazine North Korea may have conducted two covert nuclear weapons tests in 2010, according to a fresh analysis of radioisotope data. The claim has drawn scepticism from some nuclear-weapons experts.

By Geoff Brumfiel of Nature magazine Bill Murray is a man with secrets.

By Geoff Brumfiel of Nature magazine Today IBM unveiled a new "cognitive computing" microchip that, according to the company, emulates some of the brain's abilities. [More]

By Geoff Brumfiel of Nature magazine A team of physicists is claiming to have coaxed sparks from the vacuum of empty space. [More]

By Geoff Brumfiel of Nature magazine St-Paul-lez-Durance, France The world's largest fusion experiment is finally beginning to take shape. [More]

By Geoff Brumfiel of Nature magazine In the era of WikiLeaks and Twitter, can anyone keep a secret? Governments have learned that, all too often, the answer is no. [More]

During the morning of April 6, our colleagues at Nature ran a live, online question-and-answer event about the Fukushima Daiichi nuclear crisis . Visitors posted questions for Jim Smith, an environmental physicist from the University of Portsmouth, U.K., and Geoff Brumfiel, Nature’s senior physical sciences correspondent. Brian Owen served as moderator.

By Geoff Brumfiel T The magnitude-9.0 earthquake rocked Fukushima Daiichi nuclear power station at 2:46 p.m. [More]