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The Tijuana River Estuary was designated by the United Nations as a "wetlands of international significance." But environmental activists say this binational ecological area is threatened by developme

Tomatoes are the most frequently bought and the most commonly homegrown vegetable in the United States. With all that popularity we wondered whether consumers can tell the difference between organic and conventionally grown tomatoes, and is one growing method better that the other? KPBS Environmental Reporter Ed Joyce put organic, heirloom and conventionally grown tomatoes to the test and tells us what he's found out.

Astronomers have a mystery on their hands, after a radio telescope in Australia detected an extremely brief, but extremely strong, pulse of radio waves. There was just one pulse, but based on its strength and the way the signal arrived at Earth, astronomers estimate it came from something 1 billion light years away. There is only speculation about what the "something" was.

NASA has announced that Lockheed Martin will build America's new space capsule, called Orion. Expected to orbit Earth by 2014, Orion is expected to reach the moon by 2020. Although the capsule design has not been deemed to be especially exciting, unlike earlier capsules, Orion will be reusable. Melissa Block talks with U.S. Air Force Chief Scientist Mark Lewis about the spacecraft.

Japan's governing Liberal Democratic Party suffers a severe defeat in parliamentary elections, losing control of the upper house of parliament. But Prime Minister Shinzo Abe says he will stay in office.

California Gov. Arnold Schwarzenegger endorses measures to reduce greenhouse gas emissions statewide. California's air quality goals have implications for industry and auto makers because they often lead to a ripple effect for laws across the country.

Scientists have solved one of the toughest problems in mathematics, performing a calculation to figure out the symmetry of a complicated 248-dimensional object known as the Lie group E8. The solution is so large that it would take days to download over a standard Internet connection.

The debate over the United States military's partnership with Chicago Public Schools continues to intensify among parents, educators and policy experts. Pauline Lipman, a Chicago urban education expert, and Herman Badillo, a New York attorney and policy expert, analyze the ongoing debate.

In these prepared remarks, President-Elect Barack Obama calls himself the unlikeliest presidential candidate, and warns supporters about the enormous problems the country must now face.

It's been five years since the San Diego City Council voted to require contractors to pay a "living wage" to their workers. Local labor advocates are celebrating the anniversary this week. We will discuss the impact the "living wage" requirement has had in San Diego.