Invasive weed threatens Southern California's deserts

Once thought resistant to invasion, regional deserts are losing native plants to aggressive weedy species like Saharan mustard. New research shows its spread is disrupting biodiversity and reducing the desert's ability to ...

Chinese astronauts set to blast off for space station

China will send a new team of astronauts to its space station on Thursday, as the country marches toward its ambition of becoming a space power to rival the dominance of the United States.

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