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Steven Chu's efforts to curb U.S. energy consumption included Washington, D.C.'s Bike To Work Day.

Energy Secretary 'Optimistic' But Cautious

Steven Chu tells NPR he favors more moderate steps as the U.S. attempts to reduce energy consumption — such as buying energy-efficient appliances and learning how to put your computer in sleep mode to save electricity.

Quakes Pose Greater Risk To US Reactors Than Previously Thought

A quarter of America's reactors may need modifications to make them safer.

Mild forms of dental fluorosis (shown in teeth pictured above) are increasingly common, according to the American Dental Association, and cause teeth to become discolored, most often with white streaks.

Feds Urge Fluoride Levels Be Watered Down

As San Diego waits for water fluoridation, the U.S. Departments of Health and Human Services and the Environmental Protection Agency re-evaluate how much fluoride is too much fluoride.

NASA's Kepler mission has discovered a planet that circles two stars instead of one. The planet, shown as the black dot in this artist's illustration, is similar to Saturn, though it is more dense and travels in a 229-day circular orbit around its two stars.

Here Come The Suns: New Planet Orbits Two Stars

NASA's Kepler mission has found a new solar system where a Saturn-like planet spins around twin stars 200 light-years away from us. It's the first direct observation of such an arrangement, and astronomers say they're not sure why the planet is there.

UCSD students opting for 'green majors' in larger numbers.

Demand For 'Green Majors' At UCSD Outstrips Resources

The demand for majors related to environmental jobs is climbing at UC San Diego. What is driving the growing interest?

Monica Bill Barnes dance company’s performance of Another Parade will take place at this weekend's Wonderland Dance Festival.

Culture Lust Weekend: Contemporary Dance, Border Films, and Quantum Physics.

This weekend can be spent inside, experiencing the art of dance, outside, at the Crew Classic, or checking out some music, photography, film, and everything in between. Culture Lust contributor Jocelyn Maggard lists some options.

'Hurt Locker,' 'Avatar' Lead Oscar Contenders

The war-on-terror thriller and the sci-fi sensation received nine Academy Awards nominations each, including best picture and director for Hurt Locker's Kathryn Bigelow and her ex-husband James Cameron.

The Space Shuttle Atlantis STS-125 blasts off from launch pad 39-A at Kennedy Space Center on May 11, 2009 in Cape Canaveral, Florida. Atlantis is scheduled for an 11-day mission to service the Hubble telescope.

Astronauts To Give Hubble One Last Hug

The Hubble Space Telescope is about to get a long-awaited makeover, as NASA astronauts head out on a final mission to repair the aging but beloved observatory. Space Shuttle Atlantis blasted off Monday just after 2 p.m. ET.

No Thank You, We Like Pain

There once was a man who liked to spend his time inhaling a lot of different gases. He was looking for a cure to tuberculosis. Some of the gases burned like heck, but one made him feel sublime. But doctors said, "No, thank you; pain is a good thing."

Experts Urge Officials To End Mountaintop Mining

A group of hydrologists, ecologists and engineers analyzed years of research and found that mountaintop removal as a way to mine coal is more damaging to the environment and public health than the law should permit. They're urging federal and state authorities to halt or alter the practice.

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