A trial vaccine against Ebola could be tested on healthy volunteers in the UK in September, says an international health consortium.

Scientists in Iceland say they are examining several depressions, termed 'cauldrons', near Bardarbunga volcano, which could be a sign of an eruption.

Astronomers have shown that dead stars known as white dwarfs can re-ignite and explode as supernovas.

Scientists have tracked the spread of Ebola in West Africa, revealing genetic clues to the course of the outbreak.

A study of genetic sequences sheds light on the settling of the North American Arctic, from ancient "Paleo-Eskimos" to the modern-day Inuit.