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DENVER (AP) — A new variant of the coronavirus that may be more contagious has been found in a Colorado man who had not been traveling, triggering a host of questions about how the first U.S. case of the new version showed up in the Rocky Mountain st

The world’s biggest COVID-19 vaccine study got underway Monday with the first of 30,000 planned volunteers helping to test shots created by the U.S. government -- one of several candidates in the final stretch of the global vaccine race. There’s stil

The decade that just ended was by far the hottest ever measured on Earth, capped off by the second-warmest year on record, two U.S. agencies reported today. And scientists said they see no end to the way man-made climate change keeps shattering records.