barbara hope zuckerberg. we try to live in the moment, to not miss what's right in front of us. at mutual of america, we believe taking care of tomorrow can help you make the most of today. mutual of america financial group, retirement services and investments. >> for 25 years, consumer cellular's goal has been to provide wireless service that helps people communicate and connect. we offer a variety of no-contract plans, and our u.s.-based customer service team can help find one that fits you. to learn more, visit www.consumercellular.tv. additional support has been provided by: and by the corporation for public broadcasting, a private corporation funded by the american people. and by contributions to your pbs station from viewers like you. thank you. >> sreenivasan: good evening, and thank you for joining us. more u.s. troops arrived in afghanistan today to protect the embassy and help evacuate u.s. and afghan personnel as the taliban took over more of the country, including mazar-e- sharif, the country's fourth largest city. this afternoon, president joe biden-- who is spendin

barbara hope zuckerberg. we try to live in the moment, to not miss what's right in front of us.mutual of ameca, we believe taking care of tomorrow can help you make the most of today. mutual of america financia group, retirement services and investments. >> for 25 years, consumer cellular has been offering no-contract wireless plans, designed to help people do more of what they like. our u.s.-based customer service team can help find a plan that fits you. to learn more, visit www.consumercellular.tv. additional support has been provided by: and by the corporation for public broadcasting, a private corporation funded by the american people. and by contributions to your pbs station from viewers like you. thank you. >> sreenivasan: good evening and thank you for joining us. afghanistan is on the verge being under taliban control tonight almost 20 years after the united states and nato troops forced the islamist fundamentalist group from power. here's what we know as of late this afternoon: president ashraf ghani left the country. evacuations of u.s. and other embassies are underway

barbara hope zuckerberg. we try to live in the moment, to not miss what's right in front of us. at mutual of america, we believe taking care of tomorrow can help you make the most of today. mutual of america financial group, retirement services and investments. >> for 25 years, consumer cellular has been offering no-contract wirelesslans, designed to help people do more of what they like. our u.s.-based cusmer service team can help find a plan that fits you. to learn more, visit www.consumercellular.tv. additional support has been provided by: and by the corporation for public broadcasting, a private corporation funded by the american people. and by contributions to your pbs station from viewers like you. thank you. >> sreenivasan: good evening, and thank you for joining us. the united states continues to see a surge in new infections from the coronavirus delta variant-- but increasing hospitalizations and deaths are almost exclusively among the unvaccinated. today, the nation's top fectious disease expert said even though the virus surge may get worse before it gets better, new