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Scientists in Japan prove that it is possible to get a live, fertile mouse by activating an egg containing only DNA from female mice. The process of getting an unfertilized egg to start dividing is called parthenogenesis. Although many non-mammalian species reproduce this way, the Japanese mouse is the first known incidence in mammals. NPR's Joe Palca reports.

Fierce street fighting breaks out in a Sunni neighborhood of Baghdad. And battles continue around Fallujah, even as U.S. occupation authorities dispatch an Iraqi delegation to negotiate a cease-fire there. There are reports that insurgents may agree to a truce beginning Sunday. Hear NPR's Cheryl Corley and Anthony Shadid of The Washington Post.

After two months of the Bush campaign's television advertising blitz, Democratic presidential candidate Sen. John Kerry is airing commercials that aim to make him better known to the American electorate, explain his position on Iraq, shed light on his national priorities and counter the Bush campaign's anti-Kerry message. NPR's John McChesney reports.

Despite the intensified fighting in Iraq, South Korea is committed to sending 3,000 more troops to assist the U.S.-led occupation. Meanwhile, the painful memory of 5,000 South Koreans who died fighting alongside Americans in the Vietnam War still looms. NPR's Rob Gifford reports.

As reports show the U.S. economy added 308,000 jobs in March, Republicans on Capitol Hill generally claim the numbers vindicate the GOP's tax policies. Democrats have conflicting reactions: relief that Americans are finding jobs, but criticism that job production is still not good enough. NPR's Andrea Seabrook reports.

U.S. Marines target a mosque complex in the besieged town of Fallujah with rockets and a large bomb, killing at least 25 people and possibly as many as 40. Insurgents were reportedly using the mosque to stage attacks on U.S.-led forces. Hear NPR's Michele Norris and Eric Niiler of member station KPBS, who is with the First Marine Division.

U.S. Marines besiege the Iraqi town of Fallujah, west of Baghdad, where crowds mutilated the bodies of four American civilians killed in a roadside attack last Wednesday. The Marines are preparing a new offensive in Fallujah to root out those responsible for the killings. Hear NPR's Melissa Block and Eric Niiler of member station KPBS in San Diego.

U.S. Marines in Fallujah have discovered weapons, documents and tapes that suggest non-Iraqi Arabs have played a substantive role in the anti-U.S. insurgency in Fallujah. Letters suggest many of the foreign fighters are Sunni Muslims who came to fight the Shiite majority. Hear NPR's Bob Edwards and KPBS reporter Eric Niiler in Fallujah.

Few residents of Fallujah seem to show remorse for attacks Wednesday on four U.S. civilians in the city, whose bodies were burned and hanged by angry mobs. Many residents in the restive town tell reporters the grisly deaths were a proper show of disdain for America. Hear NPR's Bob Edwards and New York Times reporter Jeffrey Gettleman.

The killing of four U.S. civilians working for a private security contractor raise doubts about whether employees of private firms receive adequate training and oversight. The U.S. military is increasingly giving such businesses more responsibility in Iraq -- including jobs that U.S. troops have traditionally done. Hear NPR's Eric Westervelt.