Welcome To London

July 27 to Aug. 12, London will host the Summer Games. A total of 10,500 athletes from 204 nations will compete in 26 sports. Some, like swimming and track and field, have been a part of the Games since they began in 1896. Others are relative newcomers: BMX cycling just made its debut at the 2008 Beijing Games. — Anna Prokos, Time For Kids and MCT.