December 31, 2002 This year, scientists issued a steady stream of retractions, reversals, and reassessments. For example: hormone pills don't protect against disease; the food pyramid doesn't make sense; and a common knee surgery is a waste of time. NPR's Christopher Joyce reports. (5:30)
December 25, 2002 In the second part of a series on the international oil market, NPR's Christopher Joyce reports on techniques being used in Texas to literally squeeze the last drops of oil from the land.
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December 24, 2002 In this first of four stories on the United States' dependence on foreign oil, NPR's Christopher Joyce looks at the effect war with Iraq may have on US oil supply and demand.
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December 17, 2002 A study in the journal Science finds the volume of fresh water flowing into the Arctic Ocean from rivers in Asia and Europe appears to be rising. The phenomenon could have a transforming impact on currents and global climate by century's end. NPR's Christopher Joyce reports.
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December 12, 2002 The male tree-hole frog of Borneo has quite a vocal range. But it's not to be compared with that of a great human singer -- such as Julie Andrews, for instance. That was the message of Alan Parrish of Ithaca, N.Y., and several other NPR listeners who reacted to a report from NPR's Christopher Joyce on the vigorous vocal efforts of tree-hole frogs seeking mates. Parrish points out that the frog's range covers about two octaves -- far less than the five-octave range once enjoyed by Ms. Andrews. NPR's Robert Siegel and NPR's Michele Norris concede the point, and offer an improbable duet -- tree-hole frog and musical legend -- on "Spoonful of Sugar" from Ms. Andrews' classic film Mary Poppins.
December 6, 2002 The U.N. expects Saturday delivery of an Iraqi accounting of chemical, biological and nuclear programs. Iraqi officials say the report will be exhaustive, but will produce no previously undisclosed information. Hear NPR's Michele Kelemen and Christopher Joyce.
December 6, 2002 The U.N. inspectors now in Iraq have the latest forensic equipment and the experience of the last round of inspections to help them. But as NPR's Christopher Joyce reports it still won't be an easy job to find out the truth about Saddam's arsenal of weapons.
December 5, 2002 A scientist has discovered the amazing ability of a species of tree frog to change the pitch of its mating call to match the resonant frequency of the tree hole he hangs out in. As NPR's Christopher Joyce reports, this enables the lovelorn frog to give his call maximum volume...and when the air space inside the tree hole changes (as rainwater fills it), he modifies his call to again reach maximum volume. (4:15)
December 5, 2002 The sexiest male tree-hole frog is the one with the loudest, most robust call. So males try to gain an edge by adapting the pitch of their call to get an volume boost from their water-logged tree hole lairs. Researchers say the acoustic trickery is quite ingenious, and previously unknown in the animal kingdom. NPR's Christopher Joyce reports.
November 23, 2002 The recent fuel oil spill off the coast of Spain is likely to cost tens of millions of dollars to clean up. But the environmental damage is just beginning to be understood -- especially since the tanker Prestige sank with 17 million gallons of fuel oil on board. NPR's Christopher Joyce reports.
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November 20, 2002 A damaged tanker sinks off the coast of Spain, spilling tons of oil into the ocean. Salvage crews work to contain the spill; officials fear an environmental disaster worse than the 1989 Exxon Valdez spill off Alaska. NPR's Christopher Joyce reports.
November 20, 2002 Rare good news about orangutans: Scientists have found a previously unknown population of the great ape, living in the dense rainforest of Borneo. The discovery is a boost to orangutan conservation. NPR's Christopher Joyce reports for Radio Expeditions.
November 9, 2002 Recent research shows black carbon in soot may contribute to global warming by absorbing sunlight. Diesel engines are one source of soot. But wood fires in less developed countries -- including China -- are also a problem. NPR's Christopher Joyce reports.
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November 8, 2002 Two papers in the journal Nature shed new light on the relationship between wildfires and the environment. Major fires in Indonesia in the late 1990s spewed large amounts of carbon into the atmosphere, contributing to global warming. NPR's Christopher Joyce reports.
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