Most scientists agree that the impact of an asteroid hitting Earth played a major role in the extinction of dinosaurs but now there's a brand new theory about how exactly that happened.

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Expect a Hot, Smoky Summer in Much of America
The only break much of America can hope for anytime soon from eye-watering dangerous smoke from fire-struck Canada is brief bouts of shirt-soaking sweltering heat and humidity from a southern heat wave that has already proven deadly, forecasters say.
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