It’s hard to imagine now, just days after she led the U.S. women to their second-straight Olympics gymnastics team gold, but Simone Biles once got a zero on vault. Actually two zeros. The three-time world champion and practical shoo-in for the Olympic all-around gold on Thursday completely flubbed the event in which she now performs the world’s most difficult move. Both naught scores were at the same event, and it wasn’t because Biles got nervous or hadn’t trained hard enough.