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Columnist Carl Rowan died today of natural causes at Washington Hospital Center in DC. He was 75. The Washington Post once touted the syndicated writer as "the most visible black journalist in the country." Host Jacki Lyden talks with Chicago Tribune columnist Clarence Page about Rowan's life.

The debate over whether the Anasazi ancestors of today's Pueblo people were cannibals has gone on for forty years. John Nielsen reports that new evidence from a long hidden Anasazi Site called Cowboy Wash near Sleeping Ute Mountain in Colorado has added new spice to the debate. The research is published in this week's edition of the science journal Nature.

A study in the journal Nature explores the way seals distinguish between dangerous killer whales and those that are benign. NPR's Steve Inskeep talks with Volker Deecke of the Vancouver Aquarium Marine Science Center.

CHADWICK/FREELOADERS: HOST ALEX CHADWICK SPEAKS WITH RESEARCHER NORMAN HEGLUND (HEG-lind) ABOUT A STUDY WHICH APPEARED IN THIS WEEK'S ISSUE OF THE SCIENCE JOURNAL NATURE. THE STUDY FOCUSED ON TWO GROUPS OF AFRICAN WOMEN WHO CAN APPARENTLY CARRY UP TO SEVENTY PERCENT OF THEIR BODY WEIGHT WITH MUCH LESS ENERGY EXPENDED THAN THE REST OF US.

- Daniel visits squid expert Clyde Roper of the Smithsonian's Museum of Natural History. Roper - a biologist - is organizing an expedition to the South Pacific, where he hopes to find a kind of massive squid that reportedly has been sighted by soldiers and fishermen. Roper will search for the squid in a glass bubble that will descend hundreds of feet below the ocean's surface.

Wisconsin has established a 50-mile-per-hour nighttime speed limit for snowmobiles. Noah Adams talks with Karl Brooks, Snowmobile and ATV Administrator for the Wisconsin Department of Natural Resources Bureau of Law Enforcement in Madison, Wis., about the state's reasons.

Gayane Torosyan of member station WSUI reports from Cleveland, Illinois -- one of three towns along the Rock River where flooding has forced residents to evacuate their homes. The river is overflowing because of massive slabs of unbroken ice that are blocking its natural flow.

NPR's Joe Palca reports on new studies that seem to disprove the theory that the virus that causes AIDS was first transmitted to humans in tainted polio vaccine during the late 1950's. The evidence against that theory appears in today's issue of the journal Nature.

It turns out that migrating birds like to fly in a V-formation because they get more miles per gallon that way. NPR's David Kestenbaum reports that scientists writing in this week's Nature studied the aerodynamics of tame pelicans. The birds liked to fly along behind the researchers' boat.

NPR's Allison Aubrey reports that, according to a paper published in the journal Nature, ancient Egyptians prepared mummies in ways more sophisticated than previously thought. Researchers say they used embalming materials such as plant oils, tree resin and beeswax to preserve the bodies.