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

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.

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.

Police in London now say the man chased and shot to death Friday by plainclothes officers in a subway station was not linked to the city's July bombings. He was a 27-year-old Brazilian who had lived in London for several years.

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 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.

The owners of a nursing home in which patients died after they were not evacuated during Hurricane Katrina are facing negligent-homicide charges. Aid workers found 34 bodies in St. Rita's, the St. Bernard Parish facility. Robert Siegel talks with Louisiana Attorney General Charles Foti.

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.

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.

Five years ago, the Supreme Court blocked the federal government from regulating small, isolated wetlands and streams and returned those powers to the states. In some areas, such as the Houston suburbs, there is no effective regulation and thousands of acres are being filled in with dirt.