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DNA technology is helping scientists learn more about a rare genetic phenomenon. When two fertilized eggs fuse in the womb, they create a child with two full sets of genes, called a chimera. NPR's David Baron reports.

The Senate starts what promises to be a long inquiry into February's space shuttle Columbia disaster. NASA Administrator Sean O'Keefe faces questions ranging from budgets to affixing blame for the accident, which killed seven astronauts. NPR's Richard Harris reports.

The House of Representatives votes to double the reward offered for information leading to Osama bin Laden's capture. Lawmakers say they hope raising the bounty from $25 million to $50 million will renew interest in the reward. NPR's Mary Louise Kelly reports.

The Food and Drug Administration moves to end the sale of a popular steroid-like performance supplement often used in sports. Known as "andro," the chemical androstenedione is a steroid precursor -- the body converts it into testosterone and, to an extent, estrogen. NPR's Snigdha Prakash reports.

Last week's parliamentary elections have placed conservatives back in control of Iran's legislature. Reformers dominated parliament for the past four years with political support from Iran's president, Mohammed Khatami. Reformist leaders now fear a political crackdown from the right. NPR's Mike Shuster reports.

The U.S. Army is canceling the multi-billion dollar Comanche helicopter program in effort to put funds towards a new group of unmanned airships. NPR's Eric Westervelt reports warfare methods have changed since the Comanche program was started two decades ago.

As Sen. John Kerry strengthens his lead in the race for the Democratic presidential nomination, the focus shifts to his Senate voting record. His Democratic rivals and Republican strategists are examining Kerry's record closely for weaknesses they can exploit. NPR's David Welna reports.

Members of Congress are shown more photos of Iraqi prisoner abuse. Lawmakers describe images that are more graphic and sexually explicit than those that have been published so far. NPR's Andrea Seabrook reports.

Most of the focus over what happened at Iraq's Abu Ghraib prison is on the U.S. military. CIA interrogators were also present, and their role in the abuse is under investigation. NPR's Mary Louise Kelly reports.

President Bush and Sen. John Kerry are facing off against each other in their campaign ads, where the war on terror is playing out as a big issue. NPR's Mara Liasson reports that the specific "war" being discussed may not be the same for both candidates.