Pope Francis and Russian Orthodox Patriarch Kirill call for restored Christian unity between the two churches at historic talks in Cuba.
Rebel groups in Syria tell the BBC they will not stop fighting, casting doubt on an accord by world powers to bring about a cessation of hostilities.
US scientists have modelled how a 1930s-like "dustbowl" drought might impact American agriculture today, and found it to be just as damaging.
Dylan Klebold's mother breaks years of silence
The blind boy who learned to find his way around using echoes
Why tourists have stopped visiting a beautiful Italian island
Is Google finding it difficult to stick to its principles?
The story told by rare photos of the 1916 Easter Rising
Colombia's experience of the Zika virus
When's the best time to brush your teeth?
Who would play you in a movie?