How secretaries of state handle classified information

Former Secretary of State Hillary Rodham Clinton says she never sent classified information through her private email account while she served as America's top diplomat, a claim that has been met with skepticism.

Sun emits significant solar flare

The sun emitted a significant solar flare, peaking at 12:22 p.m. EDT on March 11, 2015. NASA's Solar Dynamics Observatory, which watches the sun constantly, captured an image of the event. Solar flares are powerful bursts ...

Astronauts board Soyuz to return to Earth (Update)

Two Russian cosmonauts and an American astronaut on Wednesday boarded a Soyuz space capsule in preparation for their return to Earth after spending six months at the International Space Station.

New material captures carbon at half the energy cost

UC Berkeley chemists have made a major leap forward in carbon-capture technology with a material that can efficiently remove carbon from the ambient air of a submarine as readily as from the polluted emissions of a coal-fired ...

One fractal quantifies another, mathematicians find

To humor mathematicians, picture a pile of sand grains – say, a billion – in one square of a vast sheet of graph paper. If four or more grains occupy a single square, that square topples by sending one grain to each of ...

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