Scientists detected the gravitational waves after a pair of unusual black holes collided.
Opponents of Egyptian President Mohammed Morsi were back on the street Friday, after rejecting the president’s invitation to talk. They said Morsi was offering them little in the way of concessions.
The opposition has called for Morsi to delay a referendum on the constitution, and to rescind the decree he issued last month giving himself sweeping new powers.
The president has refused, saying his political opponents are trying to use protests and violence to overturn the results of the election that his party won.
Both sides have said this is an all out fight for the future of Egypt, and the standoff has led to days of violence, resignations of top government officials and bitter fights within each camp.
Robin Young and Jeremy Hobson are hitting the road. Our Tumblr brings you behind the scenes of our election coverage.