A Japanese nuclear plant stricken by Friday's quake and tsunami has been hit by a second explosion, while a third reactor has lost its cooling system.

Researchers demonstrate a "wearable" scanner that can peer into the chemistry of a rat's brain even as it freely moves around.

Engineers race to cool down a third reactor at a quake-stricken Japanese nuclear plant, after a second blast rocks the facility.

Japan's coastline may have shifted several metres after huge quake

Why the fuel rod exposure at Fukushima Daiichi number 2 reactor is potentially the most serious event so far at the plant.

Physicist Brian Cox says the BBC is wrong to agree to turn down the music volume for his series Wonders of the Universe after viewer complaints.