situation there. but leaving isn't an option for most afghans, as their country continues to convulse with violence as u.s. troops pull out. adriana. >> diaz: such a good point. imtiaz tyab, thank you. the mars rover "perseverance" is breaking new ground.agesa boreoe where the rover tried to drill out its first sample from a dried up martian lake bed looking for signs of past microbial life. but the rover failed to collect any rocks, and nasa is troubleshooting. just ahead on the "cbs weekend news," allyson felix sets a new gold medal record, as these unprecedented olympics near the finish line. first daughter luci johnson speaks out, defending her father's voting rights act. and a one-time astronaut hopeful takes us behind the scenes on her dream journey to space.