Yuliya and Vitaly Stepanov blew the whistle on Russian doping.
Biram dah Abeid's struggle to abolish slavery in Mauritania
Going beyond the call of duty: saving hostages in Iraq, and the surgeon in a war zone.
Dr Brian Williams spoke out after treating officers shot in Black Lives Matter protest
Thai martial arts millionaire Chatri Sityodtong saved his family from poverty.
Rabia Siddique was working as a British army lawyer in Iraq when she was taken hostage
Surgeon David Nott volunteers in disaster areas, often working in hospitals under attack
The penguin, cage fighter and an airman with a secret
Zola Budd and Mary Decker ran a race for glory that ended in disaster.
Nia Vardalos turned stories about her eccentric Greek-Canadian family into two hit films