The cancellation plays into fears among scientists who worry that Robert F. Kennedy Jr. will use his position as health secretary to sow doubts about vaccines.

At least 124 cases have been reported since late January, mostly among children and teenagers who were unvaccinated or whose vaccination status was unknown.

Amazon is aiming to catch up in generative artificial intelligence and to reboot its virtual assistant, which has been leapfrogged by powerful chatbots.

Republicans have proposed lowering the federal share of costs for Medicaid expansions, which could reshape the program by gutting one of the Affordable Care Act’s major provisions.

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The terminations, which hit agencies involved in protecting the nation’s food supply and agricultural products, could have long-lasting consequences, experts said.