'There should have been one': N.S. mother drives son to ER after waiting nearly an hour for ambulance

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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.