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He invented the Segway Human Transporter, a high-tech scooter. The scooter relies on sensors, sold-state gyroscopes and software to produce a balanced ride even over rough terrain. Kamen's other inventions include a portable drug-infusion pump, a compact dialysis machine and a wheelchair that can climb stairs. Kamen heads DEKA Research and Development Corporation in New Hampshire.

A nightclub bombing in Bogota, Colombia, leaves at least 20 people dead. The club is part of a luxurious complex frequented by the city's wealthier and more glamorous personalities. NPR's Martin Kaste reports.

He is the executive director of Senior Action Network, a grassroots organization dedicated to improving the lives of seniors in the San Francisco area. He led the opposition to the Segway in San Francisco, which has become the first city to ban the Segway from sidewalks.

Historians and other scholars are examining the state of black studies. Some 400 black studies programs and departments exist, but there have been few conferences such as the one in New York this weekend, and some say there's an identity crisis. NPR's Margot Adler reports.

Among 12,000 fragments of space shuttle Columbia located so far, NASA has what may be its first significant discovery: a portion of the spacecraft's wing. But NASA is cautious about what Friday's find means for efforts to reconstruct the disaster. NPR's Richard Harris reports.

Action star Jackie Chan is back in Shanghai Knights -- and he's reunited with American sidekick Owen Wilson. This time they're after a killer in old England. Entertainment critic Elvis Mitchell speaks with NPR's Scott Simon.

NPR Senior News Analyst Daniel Schorr says that the wave of vulnerability felt by Americans since Sept. 11 has affected how they and the Bush administration react to national disaster.

Retired U.S. Navy flight surgeon and NASA astronaut Captain Jerry Linenger talks about the awe and peril of space travel. He spent five months on the Russian Space station Mir and wrote about the account in his book, Off the Planet: Surviving Five Perilous Months Aboard the Space Station Mir." He described the Mir as "six school buses all hooked together." During his time there, he says, he and fellow crew members had numerous brushes with death, lacked adequate supplies and battled constant system failures. Linenger's new book is Letters from Mir: An Astronaut's Letters to His Son.

Voters in Santa Ana, Calif., head to the polls in a recall election of a school board member accused of leading the district to violate the state's anti-bilingual education initiative. NPR's Mandalit del Barco reports.

The White House prepares to reveal intelligence to the U.N. Security Council in hopes of persuading reluctant members that Iraq remains in defiance of U.N. resolutions on weapons. Secretary of State Colin Powell is to present the evidence Wednesday. NPR's Vicky O'Hara reports.