Soviet gymnast Larisa Latynina is filled with a mixed sense of wonder and trepidation when she watches the gravity-defying and often treacherous routines of Simone Biles as the American set out to break her Olympic gold-medal record.

FILE - In this Oct. 10, 1964 file photo, Japanese runner Yoshinori Sakai lights the Olympic cauldron during the opening ceremony of the 1964 Summer Olympics in Tokyo. He symbolized the rebirth of Japan after the Second World War as he opened the 1964 Tokyo Games. Sakai was born in Hiroshima on Aug. 6, 1945, the day the United States dropped an atomic bomb on the city. Tokyo 1964: The Olympics Begin,read the banner above Sakai's photo. In fact, Tokyo 1964 remained the most expensive Olympic ever, when corrected for inflation, and on a per athlete basis, until Beijing 2008, Olympic historian Dr. Bill Mallon said.