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By Joseph Nasr MUNICH (Reuters) - Russian Prime Minister Dmitry Medvedev raised the specter of a permanent or a world war if powers failed to negotiate an end to the conflict in Syria and warned against any ground operations by U.S. and Arab forces. Medvedev, speaking to Germany's Handelsblatt newspaper on the eve of a security conference in Munich, said the United States and Russia must exert pressure on all sides in the conflict to secure a ceasefire. Asked about Saudi Arabia's offer last week to supply ground troops if a U.S.-led operation were mounted against Islamic State, he said: "This is bad as a ground offensive usually turns the war into a permanent one.
In a landmark discovery for physics and astronomy, scientists said Thursday they have glimpsed the first direct evidence of gravitational waves, ripples in the fabric of space-time that Albert Einstein predicted a century ago. When two black holes collided some 1.3 billion years ago, the joining of those two great masses sent forth a wobble that hurtled through space and reached Earth on September 14, 2015, when it was picked up by sophisticated instruments, researchers announced. "Up until now we have been deaf to gravitational waves, but today, we are able to hear them," said David Reitze, executive director of the LIGO Laboratory, at a packed press conference in the US capital.