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A new study from Stanford University suggests that pollution from ethanol could be even worse than from traditional gasoline. Study author Mark Jacobson, of Stanford's department of civil and environmental engineering, explains.

Greg Mohl has made the switch from globe-trotting executive to jolly holiday mall fixture. His new role is Santa Claus. He already looked the part and now he's part of a multimillion dollar industry.

Marilyn Albert, co-director of the Alzheimer's Disease Research Center at Johns Hopkins, talks to Melissa Block about Alzheimer's patient Tom DeBaggio, how the disease progresses, and hopes for treatment.

William Christenberry grew up in Hale County, Ala. For more than 40 years, he has returned there each summer, revisiting the same locations to document the passage of time.

For his latest CD, Chaos and Creation in the Backyard, Paul McCartney sought the help of producer Nigel Godrich. Though McCartney normally keeps a tight hold on the creative process, he allowed Godrich to take the album in unexpected directions.

Hercules, a slave of George Washington, and James Hemings, owned by Thomas Jefferson, began a long connection of presidents and their African-American cooks. And President Lyndon Johnson's black cook may have influenced his work on civil rights reform.

A mural of a basketball player is slowing down the morning commute on a Chicago freeway. Drivers have been gaping at a seventy-five-foot-wide billboard of basketball player Dennis Rodman. The advertisement for a clothier also includes Michael Jordan and Cubs second baseman Ryne Sandberg. Rick Karr reports that the garment-maker may remove the billboard if it continues to slow the traffic. (5:00) 2B CUTAWAY 0:59 Funder 0:29 XPromo 0:29 CUTAWAY 2B 0:29 RETURN2 0:29 NEWS 2:59 NEWS 1:59 THEME MUSIC 0:29 2C 17. LYBIA - NPR's Neal Conan reports on the statement by US Defense Secretary William Perry that the US would not allow Libya to finish construction of a suspected chemical weapons plant. Perry told Egyptian President Hosni Mubarak that the US has photographs showing of an "extensive" weapons program, and would not rule out using force to destroy the plant. NPR's Neal Conan reports.

The House debates a Democratic-led resolution opposing President Bush's plan to send 20,000 more troops to Iraq. Approval of the resolution is expected Friday. Meanwhile, every member of the House gets a say.

NBC's Tim Russert is being cross-examined by defense attorneys in the perjury trial of former White House aide Lewis "Scooter" Libby. Russert and Libby have told very different stories about a 2003 phone call that is at the heart of the case.

Hours after a federal appeals court declined I. Lewis "Scooter" Libby's request to delay his prison sentence, President Bush commutes the former White House aide's sentence.