read george takei's thoughts on his new musical and the history of japanese-american internment. visit www.pbs.org/newshour. >> sreenivasan: on this mother's day, we call your attention to a very sobering fact: the united states has the worst rate of mothers dying during pregnancy, childbirth, or postpartum than any country in the developed world. the "maternal mortality rate" is 26 women for every 100,000 live births in the u.s. npr and propublica last week published a joint investigation into the reasons behind this problem, and propublica reporter nina martin joins me from oakland, california, to discuss what they found. stirs first of all, put that number into perspective, 26 out of 100,000 doesn't sounder like much. how does that tack stack up against the rest of who we compare ourselves to. >> 26 out of 100,000 translates to 7 to 900 women a a year in the u.s. which compares to 7 out of 100,000 in canada, a think four out of 100,000 in most of the scandinavian countries. >> you had a scark in this tragic story about a neo nationallal nurse, someone who works around babies h