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A New Snapshot of a Black Hole Reveals Its Mysterious Physics

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« DARPA takes step toward 'holy grail of encryption'

Hoards of purple sea urchins have decimated kelp forests off the coast of northern California. In the past they were kept in check by predators like the sunflower sea star. But there have been some big ecological shifts, exacerbated by climate change, that have led to an urchin explosion. »