ask producer megan thompson in a q&a on facebook. visit facebook.com/newshour for details. >> sreenivasan: it's been nearly 70 years now since the end of world war ii. even so, stories continue to come to light about some of the victims of the holocaust. recently, newshour special correspondent martin fletcher learned what's being done to honor the life and works of one woman, one of the six million victims. his piece is a collaboration with milwaukee public television. >> reporter: when the nazis occupied czechoslovakia in 1939, tens of thousands of jews applied for visas to anywhere, and among them paul strnad and his wife hedwig, nicknamed hedy. their best hope to save their lives was help from their cousin alvin, thousands of miles away in milwaukee, wisconsin. so, on december 11, 1939, paul wrote him this letter. >> you may imagine that we have a great interest of leaving europe as soon as possible. >> reporter: and paul hoped he had an ace up his sleeve-- these drawings, eight beautiful dresses and all accessories, down to hat

megan thompson reports. >> reporter: sisters beatriz and elizabeth vergara attend public high school in a low-income, mostly hispanic section of northern los angeles. the girls are aiming for college and would be the first in the family with higher degrees. but the vergara sisters say that in middle school, they faced obstacles in pursuing their education-- chaotic classrooms and little to no instruction. elizabeth, now a senior, and beatriz, a junior, say back in seventh grade, they both had a particularly bad history teacher. >> he would just be at his desk, like, just using his computer or sleeping. >> and he would let students smoke marijuana. >> reporter: they were smoking marijuana in class? >> yeah. >> reporter: that's... >> i know, it's hard to believe. >> reporter: beatriz also says a science teacher was offensive. >> she would call this girl "whore" and, like, "slut, go over there." >> reporter: what went through your mind when you heard that? >> i was scared to ask questions because i didn't want her to, like... i didn't want her to offend me. >> reporter: beatriz and eliz

. >> woodruff: and on >> woodruff: and on pbs newshour weekend saturday, megan thompson reports fromrnia on the legal battle over teacher tenure and how that fight has led to action in other states. and we'll be back, right here, on monday, with a look at a supreme court case testing the boundaries of free speech on the internet. that's the newshour for tonight, i'm judy woodruff, have a nice weekend. thank you and good night. >> major funding for the pbs newshour has been provided by: >> and with the ongoing support of these institutions >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. captioning sponsored by macneil/lehrer productions captioned by media access group at wgbh access.wgbh.org >> this is "bbc world news." >> funding of this presentation is made possible by the freeman foundation, newman's own foundation, giving all profits from newman's own to charity and pursuing the common good. kovler foundation, and union bank. >> at union bank our relationship managers work hard

. >> sreenivasan: on pbs newshour weekend, megan thompson reports from iowa on superweeds-- herbicide-resistantnts that could threaten american agriculture. >> simple use of one herbicide recurrently in the system is going to inevitably result in weeds that evolve resistance to that herbicide. >> professor mike owen is a nationally recognized weed expert at iowa state university in ames. >> it is a widespread and a significant, from an economic perspective, problem across the midwest, and dare i say, across agculture in general. >> owen says it's no mystery why this happened. it can alling explained by evolution. in iowa, one of the weeds that has evolved to be resistant is called water hemp. >> this is waterhemp, a weed we have in southwest iowa has that's become more tolerant. this plant, when it's mature, can get five, six feet tall. where it's very heavy, you can have yields cut in half, 50% losses >> sreenivasan: that's saturday's signature segment on pbs newshour weekend. and we'll be back, right here, on monday with a look at how burn pits, used to dispose of everything from batteries to