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The words "black market" usually summon images of drugs, guns or pirated DVDs — not tubas. Yet authorities in Los Angeles say the instrument is in such high demand that the black market may be what's driving a wave of local tuba thefts.

Ruben Gonzalez is teaching an after-lunch band class at the scene of one recent tuba crime — the music room at South Gate High School outside L.A. He starts with a request only a band teacher would make.

"Make sure we rinse out folks — we don't need any hamburgers or hot chilies coming through those instruments," he says.

Is there arsenic in your rice? Probably. That's the news behind a study that found surprisingly high levels of arsenic in rice-based organic toddler formula and energy bars.

One toddler formula with organic brown rice syrup as the primary ingredient had arsenic concentrations six times the federal limit of 10 parts per billion for arsenic in drinking water.

Cereal bars that contained rice products like brown rice syrup or rice flour had arsenic levels ranging from 23 to 128 parts per billion, according to researchers at Dartmouth College, who tested the products.

The man who tried to blow up a U.S. passenger plane three Christmases ago was sentenced to life in prison in a Detroit courtroom today. Umar Farouk Abdulmutallab, 25, boarded Northwest Flight 253 in Amsterdam on Dec. 25, 2009, with a massive bomb hidden in his underwear. As the plane approached Detroit, he tried to detonate the explosives. They failed to go off.

Four months ago, on the second day of his criminal trial, Abdulmutallab pleaded guilty.

Amanda Knox, the U.S. college exchange student who won an appeal to overturn her murder conviction in Italy last October, has signed a deal to write a memoir — for which she'll earn nearly $4 million, according to reports.

The plane landed at Benghazi airport, about an hour late, which seemed just about right to most people on board. Elderly women sported tattoos from their bottom lip to the tip of their chin; several men carefully removed plants that somehow survived being crushed in the overhead luggage bins.

Between lingering New Year's resolutions and impending Lenten restraint, it's the season when many people are inspired to get healthy by refusing foods they normally delight in.

Increasingly, we're seeing elimination diets that promise weight loss and a tantalizing bonus: detoxification.

"Cleansing diets" trade on this most alluring idea: By limiting our intake of food to a few super-pure items, we can free up the body to get rid of all the gunk accumulated in our cells.

Surely you've noticed that when people move from place to place and stay for a while, they tend to pick up the local accent. We could use Madonna as an example, but we're pretty sure her British accent started before she jumped the pond.

Anyway, in a new study published in the journal Animal Behaviour, two scientists found young pygmy goats, which are known as kids, do something similar.

The United States and five other nations are embarking on a new program to limit pollutants connected to global warming. But they're not targeting carbon dioxide with this effort — instead, they're looking at methane gas, and soot.

NPR's Richard Harris filed this report for our Newscast desk:

"Secretary of State Hillary Clinton says the U.S. is teaming up with Canada, Mexico, Sweden, Ghana and Bangladesh to get countries thinking about some potent contributors to climate change."

With Twitter and other social media, NPR's Andy Carvin monitored immediate, on-the-ground developments during the upheavals of the Arab Spring from Washington, D.C., through thousands of tweets and an army of followers that numbers in the tens of thousands. Now, he is in Libya, meeting face-to-face with some of those activists. He'll be sending us periodic updates on his journey.

International pressure is building on Iran. On Wednesday, Iranian leaders claimed they made strides in their nuclear program and threatened to stop supplying oil to six European countries. Host Michel Martin hears what people inside the country think about the tensions. She speaks with writer Hooman Majd and human rights activist Sussan Tahmasebi.

China's economy sailed through the financial crisis unscathed — at least in the short run.

When the global crisis hit, the country's government-owned banks started lending out lots more money. The money came largely from the savings accounts of ordinary Chinese people. It went largely to finance big construction projects, which helped keep China's economy growing.

A closed-door summit on controversial bird flu research starts today, and the newly released guest list reveals that the event will be dominated by virologists.

Stephen Sondheim's 1981 musical Merrily We Roll Along is in the middle of a two-week run at the New York City Center as part of an Encores! Production. Portions of the interview running today were originally broadcast on April 21, 2010 and Oct. 28, 2010.

Rick Santorum released four years' worth of tax returns Wednesday evening which showed that he is wealthy by any measure.

But his returns may also allow his critics, both those aligned with Mitt Romney, his chief rival for the Republican presidential nomination and those who aren't, to attack the former U.S. senator from Pennsylvania for not giving as much to charity as many others at his income level.

The world of international relations seems to have focused on Pakistan today: The president of Iran and the president of Afghanistan both made their way to the country just as tensions between Iran and Israel made the news and just as reports emerged that the U.S. and the Taliban were beginning secret talks.

The official agenda of the meetings is to discuss counter-terrorism and transnational organized crimes at a regional conference tomorrow in Islamabad.

The meteoric rise of New York Knicks point guard Jeremy Lin has echoes of Tim Tebow, the Denver Broncos quarterback who caused such a stir last fall.

Transcript

STEVE INSKEEP, HOST:

A record rebound for General Motors is at the top of NPR's business news.

(SOUNDBITE OF MUSIC)

INSKEEP: Let's remember the carmaker almost collapsed two years ago and needed a government bailout. Today, GM announced it earned its largest profit ever in 2011.

Republican Presidential candidate Rick Santorum saw his income rise after he lost a Senate reelection bid in 2007.

According to records released to Politico late yesterday by the Santorum campaign, the former Pennsylvania senator earned $659,000 in 2007; $952,000 in 2008; $1.1 million in 2009 and $923,000 in 2010.