Two passenger trains in the Indian state of Madhya Pradesh derail within minutes of each other, killing at least 20 people, officials say.
Rick Perry, the former governor of Texas, is not among the 10 White House hopefuls who will take part in the first Republican debate.
Scientists solve the riddle of why precariously balanced rocks near the San Andreas fault have never been toppled by earthquakes - revealing crucial interactions between faultlines.
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Manchester United's Angel Di Maria says he is "very happy" to be joining Paris St-Germain, a year after moving to Old Trafford.