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Spies to use Twitter as crystal ball

US intelligence agency aims to forecast unrest by reading the runes of social media.

Dragon offers ticket to Mars

A cargo carrier designed for low Earth orbit could provide a cheap route to the red planet.

Indian Ocean communities test tsunami warning system

Drill detected no glitches, but improvements could still be made.

Brazil cooks up transgenic bean

Approval draws criticism over transparency and safety tests.

Nanoparticle solar cells make light work

Cheap, printable photovoltaics might finally live up to their early promise.

MERMAIDs detect distant earthquakes

Free-floating observatories record seismic waves to help study Earth's interior.

Human genetics: Genomes on prescription

The first clinical uses of whole-genome sequencing show just how challenging it can be.

Bacteria encode secret messages

Undercover E. coli act as updated invisible ink.

Lasers illuminate quantum security loophole

Faked 'entanglement' result challenges cryptographic technique.

Galileo gets ready for take off

Europe's satellite navigation system enters test phase.

India's nuclear future put on hold

Safety fears derail plan to import reactors.

Time is running out for the leap second

Abolition would see 'official' time unmoored from the Sun.

Scientists and autism: When geeks meet

Psychologist Simon Baron-Cohen thinks scientists and engineers could be more likely to have a child with autism. Some researchers say the proof isn't there.

Elastec scoops X prize for oil-spill clean-up

Skimming system tripled previous best effort at oil collection.

Fallout forensics hike radiation toll

Global data on Fukushima challenge Japanese estimates.