Severity of Japanese tsunami explained

Scientists at Cambridge University say they've worked out why the tsunami that devastated Japan in March 2011 was so much larger than expected.

Bacteria discovered after 86 million years

Living bacteria have been discovered deep beneath the ocean where they've had no new food or oxygen since dinosaurs roamed the earth.

Intense global warming was frequent in ancient past

Frequent periods of intense global warming took place in the distant past, say researchers at UC San Diego's Scripps Institution of Oceanography.