 Then they match those responses up with family home addresses to determine their childhood pollution exposure levels. Simone Biles is leading the way in the U.S. Olympic gymnastics trials. Friday, Biles ended the first day of the competition with a 2.5 point lead over Jordan Shiles, with Suni Lee rounding out the top three. The official gymnastics team going to Paris will be announced on Sunday, but the committee will have to make some tough decisions after three frontrunners were injured in the lead up to Friday's competition.