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Host Rachel Martin talks with Lester Reingold, a writer and Titanic enthusiast, just after he'll have attended a memorial honoring the 100-year anniversary of the Titanic's sinking from aboard a cruise ship, anchored right where the ship went down.

Barely a day passes without a fresh example of abusive behavior in cyberspace. Cyber-bullying is an epidemic that's causing misery to a multitude of often vulnerable people. NPR's Philip Reeves says the problem is so bad in Britain that people there are fighting back.

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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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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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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.

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We turn our attention now to Syria. United Nations observers are preparing to travel to Syria this week to start monitoring the fragile cease-fire between government forces and rebel fighters. The U.N. Security Council yesterday approved the deployment of a 30-member team. The monitors will have their work cut out for them. As NPR's Grant Clark reports from Beirut, military bombardment is reportedly continuing, despite an agreed truce.

Several deaths and injuries have been reported following a tornado that rolled across Woodward, Okla. It was just one of the twisters that struck the Midwest on Saturday and overnight. As Kansas Public Radio's J. Schafer reports, more than 100 tornadoes touched down across four states.

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This past week marked the unofficial start of the general election for President Barack Obama and former Massachusetts Governor Mitt Romney. Former Republican Senator Rick Santorum's departure from the presidential race cleared the way for Romney and signaled a shift to a new phase of the campaign. For more, we are joined by NPR national political correspondent Mara Liasson. Hi, Mara.

MARA LIASSON, BYLINE: Hi, Rachel.

Palo Alto, Calif., recently hosted a 12-hour bonanza for software developers, artists and families. The "Super Happy Block Party Hackathon" was a marathon for coders to make new software in a short amount of time. It also featured food trucks, music and homemade robots. Corey Takahashi reports.

Host Rachel Martin talks with Matthew Goodwin, an associate fellow with Chatham House, about anti-immigrant extremism in Europe. Goodwin explains why once-fringe political parties have gained widespread support.

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.

The midsection of the U.S. was wracked by storms and tornadoes overnight, with the National Weather Service's Storm Prediction Center forecasting more severe weather to come. Five deaths have been confirmed in northwest Oklahoma, the state's Department of Emergency Management tells NPR.

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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It's WEEKENDS on ALL THINGS CONSIDERED from NPR News. I'm Guy Raz.

PRESIDENT BARACK OBAMA: It's simple. If you make more than $1 million every year, you should pay at least the same percentage of your income in taxes as middle-class families do.

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RAZ: President Obama from his weekly Saturday video address talking taxes and his proposal for a millionaire's tax, the so-called Buffett Rule. James Fallows of The Atlantic is with me now for more on this story and others we're following. Hello, Jim.

NPR's Joel Rose has a round-up of the week's news in the Trayvon Martin shooting case. Neighborhood watch volunteer George Zimmerman is in jail and the legal case is moving forward.

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