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Warming Waters Threaten 'Unicorns of the Sea'
Researchers studying the impact of climate change on arctic creatures say that the Narwhal — the long-tusked whale that gave rise to the myth of the unicorn — could be in danger. Narwhals hunt in ice-covered areas and may be among the first animals to feel the heat of warming arctic waters.

Chilean Volcano Erupts, Forces Evacuations
The Chaiten volcano in the remote Patagonia region of southern Chile has been dormant for 2,000 years. But for more than a week, lava, ash and huge plumes of smoke have spewed from the volcano. Thousands of people in surrounding towns are being forced to leave their homes and livestock behind.

Doctor Dispels Myth that Corpses Spread Disease
It has been a week since a cyclone devastated the Myanmar coastline. Tens of thousands of bodies have yet to be identified or buried. United Nations consultant and expert on directing disaster relief Claude de Ville de Goyet talks with Andrea Seabrook about the difficult task ahead for Myanmar.

Study: Smart Fruit Flies Are Finished First
<em>The New York Times</em> ran an article this week about a study that found intelligent fruit flies don't live as long as unintelligent ones. The scientist who performed the study, Tadeusz Kawecki, talks about what this means for the smart-guys of bugs and humans alike.

Norwegian Deep-Sea Divers Sue Government
Former diver Bernie Schwerdtfeger talks about working 500 feet under the water off the coast of Norway, where he helped assemble oil rigs. Many former divers are complaining of health problems and are suing for damages.

Elvis, bin Laden and Hitler Join Mission to Mars
A Mars spacecraft carrying a DVD of thousands of names was intended to increase public interest in space missions. But the unintended consequence was lasting space memorials to Donald Duck, John Lennon, Adolf Hitler and Malcolm X.

Doctors Reject Drug Company Cash
Some leading medical experts have decided to end an age-old tradition — taking money from drug companies. These doctors used to get paid for making speeches, but they say they're reclaiming their tarnished credibility.

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.