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...according to a new study just published in Science, there may not be any mystery after all. By looking at the chemistry of fossilized foraminifera - tiny sea creatures no bigger than a grain of sand - a team led by Aradhna Tripati, of University of the California, Los Angeles, has detected a significant CO2 bump during both warming episodes...
...relationship between CO2 and climate is clear going back about 800,000 years. Before that, however, it gets murkier. That's largely because ice and air that old haven't yet been found. So scientists rely instead on indirect measurements - and these have led to a climate mystery: some episodes of past warming, including a planetary heat wave about 15 million years ago and another about 3.5 million years ago, seem to have happened without a rise in CO2. No one quite understands why. Maybe other greenhouse gases were the cause - methane, for example. Or maybe...
Above all, Shaker adored horses, which she had ridden since she was eight years old. It was her love for riding that led her to join the Harvard Polo Club this year...
...Alexander the Great was marching across the Hindu Kush mountains on his way to India over 2,000 years ago. The Greek had heard that Afghan tribes had fierce fighters, so he dispatched part of his force through the northwest, which was supposed to be the easier route, and led the remainder of his army straight through the middle of the Hindu Kush. The commander who had gone through the northwest, expecting less resistance, arrived exhausted and bloodied on the banks of the Indus River. He had fought every step of the way. But Alexander, who had journeyed through...
...aftermath and whether justice has really been served. For all the big fish it may have landed, the International Criminal Tribunal for Rwanda (ICTR) has yet to consider the case of a single person accused of committing atrocities on behalf of the Rwandan Patriotic Front (RPF), the guerrilla movement led by now President Paul Kagame...