but to kwolek, her crowning achievement was making kevlar possible. stephaniefortunate enough to do something that would be of benefit to mankind. it's been an extremely satisfying discovery. i don't think there's anything like saving someone's life to ing you satisfaction and happiness. ali: kwolek died in 2014 at the age of 90, but her greatest invention is still saving lives today. for previous news weekend, iannelli rogin. -- i am ali rogin. ♪ john: on the pbs newshour instagram right now, hear what oklahoma state representative mauree turner had to say to more than 100 students and lgbtq+ supporters, following the death of a 16-year-old transgender student. all that and more is on our newshour instagram. and that is pbs news weekend for this sunday. on monday, the latest in our series "america's safety net" examines the challenges millions of americans face getting housing choice vouchers. i'm john yang. for all of my colleagues, thanks for joining us. have a good week. >> major funding for the "pbs news weekend" has been provided by -- and with the ongoin