Darek Fidyka, 40, was paralysed after being stabbed repeatedly in the back in a 2010 attack.

A paralysed man has been able to walk again after a pioneering therapy that involved transplanting cells from his nasal cavity.

Autumn colours begin to show on trees at the Forestry Commissions National Arboretum at Westonbirt near Tetbury on October 7, 2014 in Gloucestershire, England.

Scientists say that between 1901 and 2010, living things absorbed 16% more of the gas than previously thought.

Philip Morris International Inc. Marlboro brand cigarettes are displayed for sale at a gas station in Princeton, Illinois, U.S., on Wednesday, Oct. 15, 2014.

The smoking cessation drug will maintain its black label warning.

Medical staff perform a surgical procedure in an operating room of the cardiac surgery unit at the CHU Angers teaching hospital in Angers, western France, on October 24, 2013.

The technique, originally developed in India, offers patients the chance of a much faster recovery.

Jupiter, Venus, Mercury and Mars are seen in rare alignment over the Australian east coast on May 13, 2011 in Sydney, Australia.

Ice has been spotted in shadowed craters on Mercury's surface.