epa03682858 British physicist, Sir Stephen Hawking, speaks during the launch of a report by the charity Breathe On UK, at Portcullis House in London, Britain, 30 April 2013.
Breathe On UK is a charity that supports families of children on long-term ventilation. EPA/FACUNDO ARRIZABALAGA
An activist wearing a gas mask is seen in the Zamalka area, where activists say chemical weapons were used by forces loyal to President Bashar Al-Assad in the eastern suburbs of Damascus August 22, 2013. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
