Investigators are working to piece together the secret life of Germanwings co-pilot Andreas Lubitz, who officials say was hiding an illness from his employers.
Lights went out in cities around the world for Earth Hour to raise awareness of environmental issues.
"We put our lives and our children's lives in their hands."
SHARM EL-SHEIKH, Egypt (Reuters) - Libya told an Arab summit on Saturday that a U.N. arms embargo on the country must be lifted to help prevent the advance of Islamic State militants.
On Scott Kelly's return, he will be compared to his twin brother to study what space does to the body.