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President Donald Trump on Tuesday announced the U.S. government will purchase 100 million doses of Moderna's experimental coronavirus vaccine, which is currently in late-stage human trials. Moderna separately said the deal for its vaccine, mRNA-1273, is worth $1.53 billion and will give the federal government the option to purchase up to 400 million additional doses. The U.S.…

By Michael Marshall Tools found in the Chiquihuite cave in Zacatecas, Mexico, suggest humans arrived there earlyMads Thomsen HUMANS seem to have been living in the Americas as early as 33,000 years ago – 15,000 years before the most widely accepted date. The finding implies that people arrived there before the peak of the last…