Michael Phelps adjusts his goggles in the Men's 200M Individual Medley semifinal at the 2016 Rio Olympics

USA's Michael Phelps adjusts his goggles before a Men's 200M Individual Medley semifinal at the Olympic Aquatics Stadium at the 2016 Rio Summer Olympics in Rio de Janeiro, Brazil, on August 10, 2016. Photo by Richard Ellis/UPI.