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US President Donald ​Trump called on Americans to protect the freedoms the nation's founders envisioned 250 years ago against what he has portrayed as the "communist" threat posed by progressive Democrats, speaking on the eve of Independence Day at Mount Rushmore.

There is an urgent need for greater climate action across the sports industry, emphasizing the critical role athletes can play in shaping a more sustainable future for sport, according to a new briefing report.

More than half a century ago, Sir Roger Penrose envisioned a scenario in which energy could be extracted from a black hole spinning at extreme speeds. He proposed that a particle entering its ergosphere—a region of space dragged around by a rotating black hole—could split into tw