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Is It Better to Eat Locally or Eat Differently?
When it comes to greenhouse gas emissions, what you eat may be more important than where your food comes from. A new study finds that replacing red meat and dairy products with chicken, fish or vegetables could have the same impact as shifting to an entirely locally-grown diet.

Common Weedkiller May Cause Hormonal Problems
Researchers report that atrazine, the second-most-applied weedkiller in the U.S., may be able to disrupt hormonal signaling in humans. The herbicide, which has been banned in Europe, is suspected of playing a role in sexual abnormalities in fish, frogs and other aquatic organisms.

Mysterious Memristor: Electronics' Missing Link?
Introductory electronics classes focus on circuit diagrams involving combinations of resistors, capacitors and inductors. Now, researchers have discovered a fourth passive circuit element — one that fills in a gap in equations describing relationships between voltage, current and magnetic flux.

Study: Sahara Gradually Dried Up Over 6,000 Years
What made the Sahara Desert go dry — and are there ancient waters still hidden below the sands? In a controversial study published in the journal <em>Science</em> researchers argue that the drying of the Sahara took place over thousands of years — not suddenly as was previously thought.

Scientists Mark 25 Years of HIV Research
In May 1983, the first scientific papers were published describing the possible connection between a retrovirus and the development of AIDS. The virus went on to become known as HIV. Experts discuss whether, 25 years later, scientists any closer to a cure for AIDS or to a vaccine to prevent HIV transmission.

Water-Cooled Supercomputer Set to Study Climate
IBM has designed a supercomputer that is water-cooled. It's the first one in the United States, and it is destined for scientists working on models of how climate is likely to change regional weather patterns — one of the most demanding problems in the climate science world.

Q&A: Doctors on Puberty-Delaying Treatments
A new medical treatment suppresses hormones that would bring on puberty in children with gender identity issues. Two doctors talk about the ethics of using the therapy for transgender teenagers and adolescents.

Parents Consider Treatment to Delay Son's Puberty
After years of struggling with their son's gender identity issues, Robert and Danielle decided to seek treatment. One option they are looking into would buy Armand, now Violet, more time to decide whether he wants to physically become a female. But it comes with risks.

Is Lying to Others a Form of Lying to Yourself?
A study published in the journal <em>Emotion</em> says that embellishing stories to friends is not really an attempt to deceive others, but rather, an attempt to express your true hopes and goals. Self-serving exaggeration, the researchers say, is psychologically very different from other forms of lying.

Drunk-Driving Blocker Called Threat to Tradition
A new device called Interlock disables a car's ignition if the driver has had too much alcohol. An organization opposed to the system bought an ad arguing the technology will put an end to the American traditions like wedding toasts.

For Prospective Moms, Biology and Culture Clash
The average age of mothers is steadily rising as more women wait to have children until after attending college and starting a career. But how long is too long to wait?

Police Who Died of Sept. 11-Linked Illnesses Honored
The New York Police Department has added eight more names to its wall of heroes. The officers died of illnesses they developed from their rescue and recovery work in the Sept. 11, 2001, attacks. The ceremony comes as other Ground Zero workers pursue a lawsuit against the city over health issues.

Old Drug Offers New Hope for Marfan Syndrome
New evidence indicates that the connective tissue disorder, which can be deadly, may be treatable with a common blood pressure drug.

Proving a Building 'Green' Can Be Daunting
The massive City Center development in Las Vegas is huge, expensive and environmentally friendly. It meets the building industry's green building, or LEED, standards. But critics knock LEED's one-size-fits-all point system and the cumbersome certification process.

Six Protected Sea Lions Found Dead Along River
Six sea lions were found dead along the Columbia River between Oregon and Washington. The sea lions feed on chinook salmon, much to the annoyance of fisherman. The Oregon Department of Fish and Wildlife had set traps to catch and remove the sea lions. Agency spokesman Rick Hargrave talks about the investigation into their deaths.