A ceasefire has come into effect in Colombia between the main leftist rebel group and the government, ending one of the world's longest insurgencies.
A suicide bomb attack on a military facility in the southern Yemen city of Aden kills at least 40 people, officials say.
A team of six people complete a Nasa-funded Mars simulation in Hawaii, after living in a dome in near isolation for a year.
Why so many men cannot get married in China
The passengers keeping an eye on the ticket inspectors
Why India needs to get rid of sedition law
The reverse exodus of Pakistan's Afghan refugees
The 10-day race to protect millions from yellow fever
Meeting the diplomat who helped broker Colombian peace
How a few minutes of exercise can make you healthier
Edinburgh Military Tattoo tribute to David Bowie