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STOCKHOLM — Three U.S.-based scientists won this year’s Nobel Prize in chemistry on Wednesday for developing powerful computer models that researchers use to understand complex chemical interactions and create new drugs.

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PARIS (AP) — New results from looking at the split-second after the Big Bang indicate the universe is 80 million years older than previously thought, but core concepts in physics about the cosmos — how it began, what it’s made of and where it’s going — seem to be on the right track.