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RACHEL MARTIN, HOST:

To Istanbul now, where negotiators for Iran and six world powers say yesterday's talks on Iran's nuclear program represent a constructive beginning. They agreed to meet again next month in Baghdad. U.S. officials note there is still a long way to go before the world can be satisfied with Iran's claims that it's enriching uranium only for peaceful purposes. But both sides say they're willing to try a step-by-step approach to resolving the issue. NPR's Peter Kenyon has more.

It's the first in a series of conversations between host Rachel Martin and NPR sports correspondent Mike Pesca. Pesca digs deeper into big sports stories from the week, and brings one wildcard story that stayed under the radar.

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RACHEL MARTIN, HOST:

This is WEEKEND EDITION from NPR News. I'm Rachel Martin. North Korea's new young leader, Kim Jong Un, stood before cheering troops and citizens today to make his first public speech. The address rounded off two weeks of celebrations to mark 100 years since the birth of the nation's late founder and comes in the wake of Friday's failed missile launch. NPR's Louisa Lim reports on a new approach to leadership in the world's most isolated nation.

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President Obama emphasized at a summit of leaders from across the Americas that the U.S. would not shift strategies in the war on drugs. His administration had, in recent weeks, faced criticism from some presidents who said the U.S. approach to the drugs trade had simply generated more violence in Latin America.

That wasn't the only thorny issue Obama faced in his trip to Colombia.

Norwegians will be confronted again this week with the terrible details and trauma of the worst peacetime attack in the country's history.

Police say last July 22, Anders Behring Breivik set off a car bomb in the center of Oslo near government offices. The blast killed eight people and spun residents and police into a state of chaotic alarm and confusion.

GOP presidential candidate Mitt Romney will spend the next seven months convincing us to send him to the White House. To get there, he'll have to make a strong case to one very important voting bloc: women.

A poll out this week by ABC and the Washington Post shows President Obama with a 19-point lead over Romney with women voters. For Romney to win, he's got to make a significant dent in that margin.

How do you measure who is an effective teacher?

More states are wrestling with that question, now that the Obama administration is encouraging schools to evaluate teachers with a combination of student test scores and classroom observations.

The question of whether teacher evaluations are reliable indicators for teacher effectiveness has long been controversial. But New York City reignited the debate when it rated thousands of teachers with test scores alone — and then released those ratings to the public.

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