martes, 25 de enero de 2011

Science Columns


Science Columns
Q & A

Caffeine Concerns

In very rare cases, overdoses of caffeine have been fatal. But it would be very hard to ingest enough ordinary coffee — at least 42 cups at a sitting — to kill yourself.
OBSERVATORY

How to Tell Fossil’s Sex? Well, the Egg Is a Clue

The fossil of a species of flying reptile that coexisted with dinosaurs is the first female of its kind to be associated with an egg.
OBSERVATORY
The decorated nest of an 11-year-old black kite.

Feathering Their Nests In Plastic to Get Ahead

Using white plastic to decorate the nest is a black kite’s signal of toughness, researchers say — those that use it the most are better fighters and produce more offspring.
OBSERVATORY
D. discoideum fruiting bodies containing spores and bacteria.

Crops of Bacteria, Farmed by Amoebas

Researchers at Rice University say that agricultural tendencies occur in about a third of Dictyostelium discoideum amoebas.
Health Columns
CASES

A Young Life Passes, and a Ritual of Birth Begins

By circumcising an infant according to Jewish tradition moments after his death, a doctor who also is a mohel provided a moment of normality to a family confronting immense loss.
PERSONAL HEALTH

Long and Short of Calcium and Vitamin D

New daily recommendations have many people wondering if they’re getting enough or too much in their diets and supplements.
REALLY?

The Claim: Chia Seeds Can Help You Lose Weight.

Diet books and fitness gurus have been promoting the plant’s seeds as an appetite suppressant, with little evidence to back the claim.
Opinion
DOT EARTH BLOG

NASA's Hansen Presses Obama for a Carbon Cost and Nuclear Push

A veteran climate scientist who, as a grandfather, has become a climate campaigner, presses the president to abandon special interests.
WORDPLAY BLOG

Numberplay | Crawling Ants

A suite of insight puzzles involving crawling ants.

Science Times: Jan. 25, 2011


Science Times: Jan. 25, 2011
Christian Northeast
A wide range of studies, from brain scans to cultural observations, are building a new scientific model of the smile.
FUTURE A spacecraft from SpaceX, which wants to carry NASA astronauts.

For NASA, Longest Countdown Awaits

Worries are growing that compromises will leave NASA without enough money to accomplish anything.

Lack of Sex Among Grapes Tangles a Family Vine

An unnatural abstinence threatens to sap the grape’s genetic health and the future pleasure of millions of oenophiles.

Canine Tumor Fuels Up by Stealing Parts From Host, Report Says

A group of scientists have proposed that canine transmissible venereal tumors sometimes grab mitochondria, which produce the cell’s fuel, from the dogs they infect.
 PROCESSING  Pattern recognition is what sets experts apart from novices.

Harnessing the Brain’s Right Hemisphere to Capture Many Kings

In chess and shogi, new research suggests that experts use parts of the brains that casual players do not.

Billions of Entangled Particles Advance Quantum Computing

Radio waves are used to entangle 10 billion pairs of particles in a silicon crystal, making qubits that will linger as long as several seconds — a lifetime in quantum computing.
SCIENTIST AT WORK BLOG

Titi Monkeys and White-Lipped Peccaries

A chorus of spider monkeys and a sighting of a herd of nervous white-lipped peccaries.

SLIDE SHOW: Rocks, Ice and Science in Antarctica

Geologists John Goodge and Jeff Vervoort brought home rocks — and photographs — from their research expedition in Antarctica.
More Science News
A subway station in Brooklyn. While the Northeast shivers, the Arctic has been freakishly warm.

Cold Jumps Arctic ‘Fence,’ Stoking Winter’s Fury

Europe and the United States have had two consecutive severe winters, but it is freakishly warm 2,000 miles to the north.
An artist’s rendering of the overpass, with strips that resemble forests, shrubs and meadows, and fences along the road to funnel animals to the bridge.

Design Picked for Wildlife Crossing

A nonprofit group announced the winner of a competition to design a crossing to help migratory wildlife cross a section of Interstate 70 in Colorado.
Health News

As Doctors Age, Worries About Their Ability Grow

Many aging doctors are under increasing financial pressures that make them reluctant to retire; some experts warn that there are too few safeguards to protect patients against those who should no longer be practicing.
BOOKS

A Pound of Prevention Is Worth a Closer Look

Wild enthusiasm in seeking and treating tiny abnormalities.
OUTREACH Gina Nez, right, and Mitzie Begay visited Jimmy Begay (no relation), 87, a “code talker” in World War II, who signed an advance directive on end-of-life care.

With Poem, Broaching the Topic of Death

In Navajo culture, talking about death is thought to bring it about, so it is not discussed. Now health workers are trying to find a comfortable way to begin the conversation.

Multimedia

INTERACTIVE FEATURE: Playing With RNA

A demo of the EteRNA game in which players help create a library of synthetic RNA designs.

INTERACTIVE FEATURE: Is That a Smile? How Computers Recognize Expressions

A facial-recognition system is able to read human emotions by tracking face movements and linking the information with a database of expressions.
From left, an early Apollo suit, with rubber “convolute” at the joints; an x-ray of Alan Shepard’s Apollo14 suit and a 1960s-ear Mark IV spacesuit.

INTERACTIVE FEATURE: A Space Wardrobe

A collection of spacesuits, some worn by famous astronauts and others that never made it into space.

INTERACTIVE FEATURE: Test Your Insight

Does your mood affect how quickly you intuit answers? Play this game to find out.

Deadly Blast Comes at Sensitive Time for Russia


Deadly Blast Comes at Sensitive Time for Russia

Ivan Sekretarev/Associated Press
Investigators worked near the body a man killed in a bombing on Monday at Domodedovo, Moscow’s busiest airport. More Photos »
MOSCOW — A suicide bomber attacked Moscow’s busiest airport on Monday, killing dozens of people and injecting new pain into a country already split along ethnic lines.
Multimedia
 Back Story With The Times's Ellen Barry and Andrew E. Kramer

Related

Ivan Sekretarev/Associated Press
A man wounded in a blast was carried away at Domodedovo airport in Moscow on Monday. More Photos »
Ivan Sekretarev/Associated Press
A man wounded in a blast at Domodedovo airport in Moscow. More Photos »

There was no indication on Monday night of who was behind the blast. Past terrorist attacks have been traced to militants in the North Caucasus, a predominantly Muslim region in the south of Russia. And the city was on edge even before the attacks, after ethnic Russian nationalists lashed out violently at migrants from the troubled region in mid-December.
The attack inflicted a deep injury on Moscow’s image just as President Dmitri A. Medvedev prepared to woo foreign investors at the World Economic Forum in Davos, Switzerland. The bomb — set off in the international arrivals hall of Domodedovo, the city’s glittering showcase airport — killed and wounded visitors from the West, something that has occurred very rarely in previous terrorist attacks.
But Russians were too shocked Monday night to focus on the implications.
The smoke was so thick after the blast that it was hard to count the dead. Hours later arriving passengers stepped into the hall to see the wounded still being loaded onto stretchers. Ambulances sped away crowded with three or four patients apiece, bleeding heavily from shrapnel wounds. By nightfall, officials reported that at least 35 people had been killed and 168 wounded.
“They pushed them away on baggage carts,” said Aleksei Spiridonov, who works at an auto rental booth a few yards from the site of the blast. “They were wheeling them out on whatever they could find.”
Russia’s leaders have struggled, with a good measure of success, to keep militants from the North Caucasus from striking in the heartland. In March, two female suicide bombers detonated themselves on the city’s subway, killing more than 40 people — an act that the Chechen militant leader Doku Umarov claimed to have ordered, promising Russians that “the war will come to your streets.”
Mr. Umarov’s organization also took responsibility for the bombing of a luxury train, the Nevsky Express, which killed 28 in November 2009.
Monday’s attack could also have political implications, coming after a period of tentative liberalization. In the past, such attacks have strengthened the influence of Russian security forces and Prime Minister Vladimir V. Putin by firmly establishing security as the country’s top priority.
The bomber apparently entered the international arrivals terminal from outside, advancing to the cordon where taxi drivers and relatives wait to greet arriving passengers. The area is open to the general public, said Yelena Galanova, an airport spokeswoman, according to the Interfax news service.
Artyom Zhilenkov, a taxi driver who was in that crowd, said he was standing about 10 yards from a short, dark-complexioned man with a suitcase — the bomber, he believes. Authorities said the blast occurred at 4:32 p.m. local time, as passengers from Italy, Tajikistan and Germany emerged from customs.
“How did I manage to save myself? I don’t know,” Mr. Zhilenkov said, his track suit dotted with blood and small ragged holes. “The people behind me on my left and right were blown apart. Maybe because of that.”
Another witness, Yuri, who did not give his last name, told Russia’s state-run First Channel TV that the shock wave was strong enough to throw him to the floor and blow his hat away.
After that, the hall filled with thick smoke and part of the ceiling collapsed, said Mr. Spiridonov, the auto rental worker.
Thirty-one people died at the site of the explosion, one in an ambulance and three in hospitals, the Health Ministry said. Among the wounded were French and Italian citizens, according to the Health and Social Development Ministry. At least two Britons died, said a spokesman for the Investigative Committee.
Witnesses said many of the victims suffered terrible wounds to their faces, limbs and bodies.
“One person came out and fell,” Olga Yaholnikova told RenTV television. “And there was a man with half of his body torn away.”
Mr. Medvedev, who was scheduled to give a keynote address in Davos on Wednesday, postponed his trip to manage the aftermath of the attack. He gave brief televised remarks almost immediately, telling Russians that he believed the blast was a terrorist act.
Mr. Putin also appeared on television on Monday night, gravely ordering the health minister to provide aid to all the bombing victims, visiting clinics one by one, if necessary, he said.
In Washington, President Obama condemned what he called an “outrageous act of terrorism” and offered assistance.
The State Department said it had not received confirmation of any Americans who had been killed or wounded at the airport.
The airport, southeast of the capital, is Russia’s largest airline hub, with more than 20 million passengers passing through last year.
Domodedovo was the site of a previous terror attack, in August 2004, when two Chechen suicide bombers boarded separate planes there, killing themselves and 88 others in midair. The attack exposed holes in security, since the two bombers, both women, had been detained shortly before boarding, but were released by a police supervisor. The authorities have since worked to tighten security.
The airport remained open on Monday evening, and passengers continued to flow through the hall where the bomb had exploded. Gerald Zapf, who landed shortly after the blast, said his airplane circled the airport several times before landing, and passengers were forced to wait for some time before they could debark.
When they finally made it into the airport, he said, he and the other passengers were led past sheets of blue plastic, which hid signs of the carnage. Meanwhile, transportation officials had ordered “100 percent control of passengers and visitors and their baggage, including their hand baggage,” resulting in long, snaking lines and shoving matches at the airport’s entrances.
Monday’s explosion pointed to the continuing fascination with air travel for militants and the difficulty of carrying out an attack aboard a jet, said Stephen A. Baker, a former official with the Department of Homeland Security. “They’d like to be bombing planes and they can’t, so they’re bombing airports,” he said.
Michael Schwirtz and Andrew E. Kramer contributed reporting
.

Google and Mozilla Announce New Privacy Features


January 24, 2011, 12:52 PM

Google and Mozilla Announce New Privacy Features

Add two more Internet browser makers to the list of companies planning to offer Web users new ways to control how their personal data is collected online.
On Monday, Mozilla and Google announced features that would allow users of the Firefox and Chrome browsers to opt out of being tracked online by third-party advertisers. The companies made their announcements just weeks after the Federal Trade Commission issued a report that supported a “do not track” mechanism that would let consumers choose whether companies could monitor their online behavior.
In a blog post by Alex Fowler, Mozilla’s technology and privacy officer, the company unveiled a proposed feature for its Firefox browser that would send a signal to third-party advertisers and commercial Web sites indicating that a user did not want to be tracked. The mechanism, being called a Do Not Track HTTP header, would rely on companies that receive the information to agree not to collect data.
The approach differs from other options currently available to users that rely on cookies or user-generated lists. In December, Microsoft announced a feature called Tracking Protection for Internet Explorer 9 that would rely on lists that users create that indicate which sites they do not want to share information with.
“We believe the header-based approach has the potential to be better for the web in the long run because it is a clearer and more universal opt-out mechanism than cookies or blacklists,” said Mr. Fowler in the blog post.
In a statement, the chairman of the Federal Trade Commisson, Jon Leibowitz, said: “Mozilla’s initiative is to be commended. It recognizes that consumers want a choice about who is tracking their movements online, and it’s a first step toward giving consumers choice about who will have access to their data. It also signals that Do Not Track options are technically feasible.”
Google’s approach relies on a browser extension, or plug-in, called Keep My Opt-Outs that will work with all versions of its Chrome browser. The extension would allow users to permanently opt out of being tracked by online advertisers who already offer opt-out options through self-regulation programs, like the Digital Advertising Alliance and the Network Advertising Initiative.
In a blog post by Google, the company said it would offer the code for the extension to developers on an open-source basis and that it planned to make the feature available for other browsers in the future.
Regarding the Google announcement, an F.T.C. spokeswoman said, “We’re pleased that Google is engaged in the process, but Mozilla and Microsoft are clearly steps ahead.”
In a statement, Mike Zaneis, the senior vice president and general counsel for the Interactive Advertising Bureau, an organization that supports industry self-regulation, said the Mozilla feature would require companies to voluntarily recognize a consumer’s choice and that it was still unclear how users could protect their privacy.
“The first analogy that comes to mind is, if a tree falls in the woods and no one is there to hear it, does it make a sound?  Well, Google has ensured an audience to hear the sound of the tree falling by working with the established industry mechanism,” Mr. Zaneis said.