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NPR's Gerry Hadden reports from Mexico City on the visit of Mexico's President-elect Vicente Fox to the United States. Fox meets in Washington today with Vice President Al Gore and later with President Clinton, and then tomorrow in Dallas with Republican Presidential nominee George W. Bush.

NPR's Jack Speer reports on the creative ways companies have responded to high oil prices. Many businesses are managing to lower their energy bills with the help of new technology.

Commentator Baxter Black looks at the trouble some companies have had trying to sell themselves to the public.

NPR's Michele Kelemen reports from Moscow that President Vladimir Putin said today he feels guilty and responsible for the sinking of submarine Kursk in the Barents Sea. He said Russia's defense minister, navy chief and commander of the Northern Fleet had all offered to resign, but he did not accept their resignations. Putin said there would be no rush to assign guilt until the facts of the accident are known. Yesterday, family members of the 118 sailors who died on the Kursk grilled Putin for hours about his handling of the crisis. Little of the meeting was shown on television. Lawyers for the Kursk families are threatening legal action against the government over the Kursk disaster.

NPR's Mike Shuster reports that Secretary General Kofi Annan has asked world governments to implement changes in U-N peacekeeping operations, as recommended by a report put together by an independent panel. The Secretary General established the panel last March after publication of two reports on the U-N's failure to prevent genocide in Rwanda and to protect residents of Srebrenica (sreh-breh-NEET-sah). The report calls for more efforts to prevent conflict and says peacekeepers must be allowed to defend themselves and their mandate. The report also calls for better peacemaking strategies.

NPR's Richard Knox reports the National Institutes of Health has announced new guidelines allowing federally funded researchers to perform experiments with cells taken from human embryos. Research with embryonic cells is controversial. Scientists say cells taken from human embryos may be helpful in treating many serious diseases, including Parkinson's and diabetes. But some people have moral objections to the research because it involves destroying a human embryo. The NIH guidelines attempt to strike a balance by insisting that federally funded scientists can only use cells taken from embryos that are left over from fertility treatments -- embryos that would otherwise be thrown away.

Ron McKay, a scientist at National Institutes of Health, joins Robert Siegel in NPR's Washington studios to talk about new guidelines for stem cell research.

Noah Adams and Laura Kraut, a member of the U.S. Equestrian Olympic team discuss how the team's horses are shipped to Australia for the Sydney games. The horses are quarantined before participating in the competition.

The National Transportation Safety Board has concluded that the TWA Flight 800 disaster of 1996 was probably caused by an electrical short circuit. The four-year investigation formally ended today, as the board stressed that the flight was NOT brought down by a terrorist action. NPR's Mary Ann Akers reports.

Asthma is the most common chronic childhood disease. For some reason, rates of asthma keep going up every year. Researchers have been looking at the causes for this increase, which has been found to be much higher in the industrialized world. Everything from exposure to dust mites and cockroaches to diet has been implicated. Now, a new study from the New England Journal of Medicine concludes that there might be another cause: too much cleanliness. The more sterile the early environment for infants six months and younger, the more problems with asthma they seem to have later in life. NPR's Allison Aubrey reports.