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Most of us take it for granted that men have deeper voices than women. Now scientists are learning why we associate a deep baritone with being manly: they might be a sort of mating call.

Crackdowns on methamphetamine ingredients have reduced the number of meth labs in the nation's heartland, but demand for the drug has not gone away. Mexican traffickers are now supplying purer "ice" meth that leads to quicker addiction and more violence.

Reports that Shiite leader Muqtada al-Sadr and his radical movement will end a boycott of Iraq's parliament are raising a number of questions about politics in Iraq.

Protesters say the release, which won the endorsement of the United Nations' nuclear watchdog last week, sets a bad precedent that may encourage other countries to dispose nuclear waste into sea.

Energy giant TXU agrees to be acquired by a group of private-equity firms in a deal worth $32 billion. If approved, it would be the largest leveraged buyout in U.S. history. The bidders are making concessions to environmentalists to help push the deal through.

A spokesperson said Tuesday that President Bush respected the jury's guilty verdict in the trial of I. Lewis "Scooter" Libby, and that he was saddened for Libby and his family.

Almost as soon as an obstruction-of-justice conviction was read for I. Lewis "Scooter" Libby, conservatives began calling on President Bush to pardon the former White House aide. Libby was convicted of lying to obstruct an investigation into who leaked CIA operative Valerie Plame's identity.

President Bush says he will make Karl Rove and former counsel Harriet Miers available to testify — but not under oath — about the firing of eight U.S. attorneys. Sen. Patrick Leahy (D-VT) and others on the Judiciary Committee respond that the rules won't bring true accountability to the process.

A White House assessment of the sluggish federal response to Hurricane Katrina calls for more clearly defining the military's role during catastrophes, along with more than 100 other recommendations.

The story of Bizet's 'Carmen'.

An estimated half-million cars were flooded in hurricane zones this year. Unsuspecting buyers around the country are likely to end up with lemons, because there's no effective system for keeping track of those cars. And there's evidence that insurers have blocked efforts to create one.

A young award-winning novelist who retrained as a war crimes researcher to document Russian atrocities and preserve Ukrainian culture has met a tragic end.

Many differences divide the Senate and House plans to overhaul immigration policy. The House version is mostly about enforcing restrictions on entering the country. The Senate measure has some of those provisions, but it also sketches a process by which immigrants who are illegally in the United States can get official permission to stay.

NPR's Scott Detrow speaks with Harvard law professor Noah Feldman on the implications the Supreme Court decision on affirmative action will have on businesses.

In a significant switch from its earlier hard-line position, Secretary of State Condoleezza Rice said Wednesday that the Bush administration would be open to multilateral talks with Iranian leaders -- but only if that nation gives up its plans to enrich uranium. Alex Chadwick speaks with Michele Kelemen about Rice's remarks.

The International Maritime Organization plans to issue a new strategy to make shipping more environmentally friendly.

Many still view beets as an old-world vegetable, dumped straight from the can onto Grandma's Sunday dinner table or served as borscht. But beneath the beet's unappealing hide is a versatile flesh that can be served hot or cold, pickled, roasted, deep fried, pulverized or eaten raw.

With President Bush planning a major speech about immigration Monday night, the Senate tries to iron out its many differences over an immigration overhaul. The president wants a bill on his desk by Memorial Day, but it remains to be seen whether lawmakers are any closer to compromise than they were a month ago.

Several new voting laws in mostly Republican-led states like Florida impose criminal penalties or fines for helping people register to vote. They particularly affect Asian American and Asian immigrant communities.

Civil rights groups in Massachusetts allege that mostly white children of Harvard alumni or wealthy donors have an edge in the admissions process that is not available to non-white students.

Several American universities are trying to make stem cells from cloned human embryos. This is what South Korean researchers claimed they had done, before that work proved to be fraudulent. The University of California, San Francisco, is at the head of the pack.

This week, we got a trailer and a promise that in July, we'll get Pokemon Sleep. the game is "part virtual pet, part sleep tracking device."

A memo written by National Security Advisor Stephen Hadley that criticizes Iraqi Prime Minister Nouri al-Maliki has been leaked to The New York Times. The memo also considers the political environment in Iraq. Robert Siegel talks with Nancy Youssef, Baghdad bureau chief for McClatchy newspapers, who has met with Maliki both before and after he took his current post.

The Iraq Study Group, whose report is supposed to come out next month, has created four different "expert working groups" to advise them. Shibley Telhami, holder of the Anwar Sadat Chair for Peace and Development at the University of Maryland, and a senior fellow at the Brookings Institution is one of them. He speaks with host Andrea Seabrook.

Audio recordings of detainee hearings at Guantanamo Bay illuminate the process. One of six detainees whose lawyers provided the tapes is heard saying it was the first time he had heard the accusations against him, three years after his arrest.