by Sebastian Smith Agence France-Presse RIO DE JANEIRO, Brazil (AFP) – Brazilian Ivonette Balthazar felt jittery ahead of a Rio de Janeiro road race Sunday, but her heart — transplanted from a German Olympian a year ago — spurred her on. In the midst of a long recovery from a transplant operation last year, the three-kilometer (1.9-mile) fun run alongside Rio’s Copacabana Beach seemed like a marathon to 67-year-old Balthazar. That heart, though, wouldn’t let her sit […]