Ontario researchers say they've found what causes long-COVID symptoms

Ontario researchers say they've found what causes long-COVID symptoms

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Serena Williams says 'countdown has begun' on tennis career

Saying 'the countdown has begun,' 23-time Grand Slam champion Serena Williams announced Tuesday she is ready to step away from tennis so she can turn her focus to having another child and her business interests, presaging the end of a career that transcended sports.