sue and edgar wachenheim iii. seton melvin. the cheryl and philip milstein family. dr. p. roy vagelos and diana t. the j.p.b. foundation. rosalind p. walter. barbara hope zuckerberg. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we're your retirement company. additional support has been provided by: d by the corporation f public broadcasting, and by contributions to your pbs station from viewers like you. thank you. som the tisch wndios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thank you for joining us. the it ranian governmnounced today that it will enrich uranium past levels agreed under the 2015 nuclear deal. they say international inspectors will have def proof of this tomorrow, and the country expects to continue going st limits every 60 days until they receive relief from economic sanctions. uranium can be enriched for clear power, or with far more refinement, for nuclear weapons. the united states withdrew from the nuclear deal a year ago, but has

sue and edgar wachenheim iii. seton melvin. the cheryl and philip milstein family. e j.p.b. foundation.li ro p. walter. barbara hope zuckerberg. rporate funding is provided by mutual of america-- designing customized individual and group retiremt products. that's why we're your retirement company. additional support has been provided by: oand by the corporaor public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new rerk, hariivasan. >> sreenivasan: good evening, and thanks for joining us. barry brought its heavy rain to louisiana today as it moved very slowly out of the gulf of mexico and onto land, briefly becoming a hurricane before turning back into a tropical storm. the storm's winds reached 75 miles an hour, making it a category one and the first named hurricane of 2019. it was downgraded to a tropical storm within hours, as its wind speeds dropped after making landfa west of new orleans. but, it was the rain, not the wind speeds, that caused evacuations and preparations for days

sue and edgar wachenheim iii. the cheryl and philip milstein family. lthe j.p.b. foundation. rosalind p. , in memory of george o'neil. barbara hope zuckerberg. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we're your retirement company. additional support has been provided by: and by the corporation for public broadcasting. a private corporation funded by the american people. and by contrutions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new yoen, hari sasan. >> sreenivasan: good evening and thank you for joining us tensions in hong kong continue to rise. last weekend mob attacked pro democracy protesters. today those protesters went back to that neigorhood and clashed with police. riot police fired tear gas and rubber bulletsnd blocked a crowd of black shirted demonstrators from marching into the area. the police did not grant permission for this march. last sunday a group of men i white shirts, appeared to target and beat pro-democracy

sue and edgar wachenheim iii. the cheryl and philip milstein family. the j.p.b. foundation. rosalind p. walter. barbara hope zuckerberg. corporate funding is provided by mutual of america-- designing custized individual and group retirement products. that's why we're your retirement company. additional support has been provided by: and by the corporation for public broadcastcog, and by ributions to your pbs station from viewers like you. thank y.ou from the tisch wnet studios at hari sreenivasan.iv >> srean: good evening and thanks for joining us this saturday july 20. i'm ha sreenivasan. 50 years ago on this very day was the apollo eleven moon cinding, so tonight we're bringing you a s program from the newly restored apollo control room at th johnson space center in houston, texas. >> we choose to go to the moon! >> sreenivasan: it was a goal president john f. kennedy set years -mbefore the histoing mission landed the first two humans on the surface of the moon. an estimated 650 million people watcd the televised event as u.s. astronaut neil armstrong pronounced the now fam

sue and edgar wachenheim iii. the cheryl and philip milstein ndamily. the j.p.b. fion.sa nd p. walter, in memory kef george o'neil. barbara hope zerg. corporate funding is provided by mutual of america--g designstomized individual and group retirement products. at's why we're your retirement company. 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. be more. pbs. masters: hollywood invented theo imathe singing cowboy, but life in the real wild west could be brutal and chaotic, rife with violence and opportunity. let's explore the fascinating origins of our modern ci as a rough and s wdy frontier town. i'm nathan masters, and thisost l.a." many people see l.a. as a city of the future, a place without a past, a freeway tropolis that sprang up fully formed in the 20th century, but the roots of southern california history run deep. people have called this land home for thousands of years, and their stories give us a r

sue and edgar wachenheim iii. seton melvin. the cheryl and philip milstein family. dr. p.oy vagelos and diana t. svage the j.p.b. foundation. rosalind p. walter. barbara hope zuckerberg. corporate funding isrovided

sue and edgar wachenheim iii. seton melvin. the cheryl and philip milstein family. dr. p. roy vagelos and diana t. svage the j.p.b. foundation. rosalind p. walter. barbara hope zuckerberg. corporate funding isrovided by mutual of america-- designing customized individual and group retirement products. that's why we're your retiment company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thanks for joining us. president trump took a history- making step onto north korean territory today and announced that talks to end the isolated, dictator-led, communist country's nuclear program would resume without any concessions from north korea. mr. p was the first sitting u.s. president to cross the demilitarized zone marking the border between north and south korea. >> ( translated ): good to see you again. >> sreenivasan: through an interpreter, north korea's

sue and edgar wachenheim iii. seton melvin. the eryl and philip milstein family. the j.p.b. foundation. rosalind p. walter. barbara hope zuckerberg. corporate funding is provided by mutual of america-- designing customized individual and group retireme products. that's why we're your retirement company. additional support has been provided by: and by the corporation for publ contributions to your pbs station othank you.like you. from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening, and thanks for joining us. another major earthquake struck southern california last night, th one registering 7.1. it was 11 times more powerful than the 6.4 earthquake on theu foth of july. >> oh my god! >> sreenivasan: the epicenter of this earthqujae was in the desert near the city of ridgecrest, not far from the center of thursday's earthquake. seismologists say the two were along the same fault. as aip result, there were mu small fires and power outages last night, but today, the kern county fire chief said there were no major injuries or f

sue and edgar wachenheim iii. seton melvin. the cheryl and philip milstein family. e j.p.b. foundation.li ro p. walter. barbara hope zuckerberg. rporate nd

sue and edgar wachenheim iii. seton melvin. e cheryl and philip milstein family. the j.p.b. foundation. rosalind p. walter. barbara hope zuckerberg. corporate funding is provided by mutual of america-- designing customized individual and group retirement procts. that's why we're your retirement company. ditional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thanu.k from the tisch wnet studios at lincoln center in new york, hari sreenivasan. ivasan: good evening and thanks for joining us. the heat wave sweeping much of the central easteru.s. is near over. a cold front is forecast to bring rain and lower teiteratures and humidity a moves from the great plains to the east coast by tomorrow night at washington dulles airport this weekend, united airlines workers were monitored to make sure tkehey cool as the temperature reached the high 90's in high humidity. >> we hohave a number of m that we use to prevent heat exhaustion. so we have cooling stations strategically placed around the