Scientists detected the gravitational waves after a pair of unusual black holes collided.
Pakistan’s new prime minister Nawaz Sharif took office this week, promising economic growth and an end to the country’s crippling power cuts.
There are blackouts just about every day, forcing factories to close and putting people out of work.
The BBC’s Shahzeb Jillani reports.
Robin Young and Jeremy Hobson are hitting the road. Our Tumblr brings you behind the scenes of our election coverage.