Gymnast set to appear in balance beam finals on Tuesday, though she could still withdraw
                                
                                
                                    (Newser) -
                                    A week after we last saw her compete, Simone Biles will return to the Olympic stage. After  pulling out of team competition finals  and four individual events— all-around , floor,  uneven bars, and vault —to take care of her mental health, saying she was  struggling with the "twisties,"...