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A Harvard dental researcher says he's figured out the purpose of the giant, unicorn-like tusk seen on narwhal whales: It acts like an antenna that allows the narwhal to sense food and sea conditions. The dentist says the tusks are a giant tooth that grows inside out, with hard tissue inside and sensitive nerves on the outside.

Kalush Orchestra's Oleh Psiuk told NPR that representing Ukraine on the world stage was a huge responsibility. He hopes people will continue to support his country.

We remember the comedian Richard Pryor, who died on Saturday. This interview originally aired on May 22, 1995.

British police shoot and kill a man in the Stockwell underground station Friday morning. The shooting -- and an arrest midday in south London -- are related to four small explosions Thursday, according to police.

President Bush announces his choice of federal judge John G. Roberts to replace retiring Justice Sandra Day O'Connor on the U.S. Supreme Court. Roberts, 50, has served on the U.S. Court of Appeals for the D.C. Circuit since 2003.

Four of the largest unions in the AFL-CIO plan to boycott the organization's 50th anniversary convention. The unions involved comprise about one-third of the AFL-CIO's 13 million members.

Thirty years ago, the National Association of Black Journalists was created. Then, African Americans held few jobs in the new business. A visit to two newsrooms shows what has changed... and what hasn't.

In an address to the nation from New Orleans Thursday evening, President Bush outlined a massive reconstruction plan to restore areas devastated by Hurricane Katrina. He touched on areas from rebuilding electrical systems to mail delivery as he pledged substantial federal help.

Astronomers have pinpointed the exact moment when Ansel Adams snapped his famous photo "Autumn Moon," capturing a serene night in the Yosemite Valley. Now there's plans to re-create that photograph Thursday night.

Many communities in the Gulf Coast wonder how they will meet debt payments on outstanding bond issues. That could make it harder to make good on old debts and borrow the new money local governments need to bring devastated areas back to life.

In his new book The Republican War on Science, journalist Chris Mooney contends that the Bush administration has distorted research and misinformed the public on issues ranging from stem-cell research to global warming. The motivation, Mooney argues, is political power.

Reconstructing the damaged infrastructure of the Gulf Coast is a focal point for the Bush administration. Mark Schleifstein, staff writer for the New Orleans Times-Picayune, says many who lost their homes or saw severe damage are still unclear on how much of the city can be saved.