Dr. Howard Tucker of Cleveland celebrated his 100th birthday on July 10, and a day later he headed downtown to throw out the ceremonial first pitch at the Cleveland Guardians baseball game, Cleveland Jewish News reports. Last year, the Guinness Book of World Records verified the Cleveland Heights, Ohio, resident as the world’s oldest practicing doctor. Cleveland Jewish News reports that Tucker, born in 1922, still teaches medical residents at St. Vincent Charity Medical Center in Cleveland and takes on medical-legal expert witness work in his spare time. After graduating from high school in 1940, Tucker attended The Ohio State...