Japan's nuclear agency upgrades the severity level of a radioactive water leak at the Fukushima plant from one to three on an international scale.

Scotland's largest bird of prey, the white-tailed eagle, breeds in the east of the country for the first time in almost 200 years.

A caterpillar that wraps itself in a leaf uses the sun to navigate as it jumps across the forest floor, according to scientists.

Italian astronaut Luca Parmitano describes how he nearly drowned as water leaked into his helmet during a spacewalk.