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NPR's Martin Kaste from Caracas reports on the end of the OPEC summit. The meeting finished with the release of a statement reassuring the world that OPEC nations would continue to provide a steady, dependable supply of oil. But also maintained they would continue to adjust production to keep price within a "fair" range.

An article in today's issue of Nature magazine suggests a large single cell organism is capable of solving a labyrinth, finding the shortest distance between it's entry and exit points. Slime Mould experts say this is far from remarkable.

NPR's Martin Kaste talks to Robert Siegel about the OPEC summit underway in Caracas, Venezuela. This is the first summit of OPEC nations in 25 years. Venezuelan President Hugo Chavez convened the summit in a bid to reinvigorate the organization, at a time when member nations are benefiting from soaring oil prices. Yesterday, some member nations warned the west against releasing more oil from strategic reserves, saying it could prompt an OPEC response.

Yesterday, the Food and Drug Administration approved the abortion drug, RU486. NPR's Joanne Silberner explains how the drug works and how it will be dispensed. The drug will only be available from doctors, not from pharmacies. It's expected to cost about the same amount as a surgical abortion.

NPR's Richard Knox reports on a new study showing that treating HIV infection within days of its occurrence may restore the immune system. A few patients have even been able to stop therapy altogether. But doctors are warning that patients should not stop therapy without consulting their doctors.

Robert talks with Republican pollster Linda DiVall, and Democratic pollster Celinda Lake, who were part of a team of researchers commissioned to survey women's political attitudes this year, about their findings. DiVall is founder of American Viewpoint. Lake is president of Lake Snell Perry & Associates.

Robert talks to David Macaulay, host of the five-part PBS Television Series "Building Big," and author of the book of the same name, about the secrets of constructing huge structures. Macaulay describes some of the equipment, and techniques used to erect dams, skyscrapers, tunnels and giant domes. (8:00) On the Web, see /www.pbs.org/wgbh/buildingbig. The book, "Building Big," by David Macaulay, is published by Houghton Mifflin, ISBN # 0-395-96331-1, publication date October 2000.

Former Canadian Prime Minister Pierre Elliott Trudeau has died, at the age of 80. Trudeau was prime minister for nearly 16 years, beginning in 1968. His party lost power in a 1979 election, but quickly regained it less than a year later, and Trudeau re-took his post until 1984. He was known as one of Canada's most colorful politicians. Robert talks to Jeffrey Simpson National Affairs Columnist stationed in Ottawa, Canada for "The Globe and Mail" newspaper.

NPR's Claudio Sanchez reports on the ongoing dispute between Philadelphia's school board and its public school teachers union. The teachers say they will not go on strike, but they're looking for improved compensation on par with their suburban counterparts in the area.

NPR's Guy Raz reports that yesterday voters in Denmark have rejected the Euro. Proponents of the new currency claimed it would help Denmark's fiscal leverage in the region, but opposition feared it would undercut the nation's large welfare state.