After all the swimming races were over, there was a unique scene on deck. Sun Yang of China showed up with a huge birthday cake in his hands and handed it over to Park Tae-hwan of South Korea. On the cake said, “Happy Birthday, Tae-hwan.” Sept. 27, the day after the last day of the swimming competition is Park’s 25th birthday. Sun, who knew this ahead of time, had prepared a cake for Park. (Yonhap) After the men...