sábado, 6 de agosto de 2011

Science review


The spacecraft Juno at Cape Canaveral on Thursday. It will make a five-year voyage to Jupiter and then orbit it for a year.
Justin Dernier/European Pressphoto Agency
The spacecraft Juno at Cape Canaveral on Thursday. It will make a five-year voyage to Jupiter and then orbit it for a year.
Sixteen years after the spacecraft Galileo explored Jupiter, NASA is preparing to send another craft, Juno, back.

Scientists Find Signs Water Is Flowing on Mars

Shifting dark streaks on the surface of Mars are signs that water is flowing there today, scientists said Thursday.
OBSERVATORY

Rare Mutation Causes Lack of Fingerprints

An Israeli doctor led a study of a Swiss family, half of whose members have a rare condition called adermatoglyphia.
OBSERVATORY
Infrared-sensing

Heat-Sensing Nose Helps the Vampire Bat Find Its Meals

The bats, which need a meal of blood every day or two, use their noses to detect heat where blood in their prey is close to the surface.
DRILLING DOWN
Carla Greathouse is the author of a report that documents a case of drinking water contamination from fracking.

A Tainted Water Well, and Concern There May Be More

Industry executives as well as regulators have said that fracking has never contaminated underground drinking water. But there is at least one documented case.
SCIENTIST AT WORK BLOG
A colleague cleaning off a scarp face to describe stratigraphy, look for charcoal, and possibly sample.

Digging Around for Snails

In order to date landslide deposits in Sichuan, China, scientists look for bones, charcoal and fossil snails.
Science Times: Aug. 2, 2011
DOWN, DOWN, DOWN Richard Branson, the Virgin Atlantic founder, is planning his craft's first deep dive this year.
John M. Heller/Getty Images
DOWN, DOWN, DOWN Richard Branson, the Virgin Atlantic founder, is planning his craft's first deep dive this year.
A group of rich daredevils, including James Cameron, Richard Branson and Eric E. Schmidt, are investing in submersibles to explore the ocean’s deepest spot.
REMARKABLE CREATURES
GHOSTLY An aboriginal rock painting of a thylacine, made several thousand years ago in northern Australia. The last thylacine died in captivity in 1936.

Call of the Thylacine: Protect the Wild

In an Australian journey, a painting of an extinct marsupial was a reminder of how fragile species are.
NEWS ANALYSIS

Particle Accelerators Full of Spin and Fury, Signifying Something

Trying to keep up with particle physics after a year of rumors and hints of what could be big discoveries is difficult unless you have a scorecard.
FEATHERED A chicken-size 155-million-year-old dinosaur found in China.

Birdlike Dinosaur Fossil May Shake Up the Avian Family Tree

A Chinese fossil representing a previously unknown species of birdlike dinosaur could represent the final straw in the theory that Archaeopteryx was the earliest bird.
PLUNDER Ruins at Monte Alban in Oaxaca, Mexico. A wave of new research holds that early states arose from warring chiefdoms as populations grew.

Sign of Advancing Society? An Organized War Effort

Organized hostilities between chiefdoms required that people subordinate individual self-interest to that of the group.
Health News
Activists urged full financing for AIDS treatment during a demonstration in New York in June.

New H.I.V. Cases Steady Despite Better Treatment

The number of new infections has remained around 50,000 a year for a decade in the United States, but the epidemic is growing rapidly worse among young gay black men.
ESSAY
DEPENDENT Amy Winehouse struggled with substance abuse.

Who Falls to Addiction, and Who Is Unscathed?

Genes, environment and psychology affect who uses drugs uneventfully and who is undone by them.
More Multimedia

VIDEO: Life Out There: Eden in a Test Tube

To better recognize extraterrestrial life should they come upon it, scientists are working to create simple life forms in a lab. But, as Dennis Overbye reports, they first have to agree what life is.

INTERACTIVE GRAPHIC: 30 Years of the Space Shuttle

An interactive timeline of the 135 space shuttle missions.

VIDEO: Nora Volkow

An interview with the neuroscientist in charge of the National Institute on Drug Abuse, who also happens to be the great-granddaughter of Leon Trotsky.

Rock-Paper-Scissors: You vs. the Computer

Test your strategy against the computer in this rock-paper-scissors game illustrating basic artificial intelligence.
Seth MacFarlane is producing a new version of “Cosmos,” the 1980 mini-series from Carl Sagan, for Fox.

‘Family Guy’ Creator Part of ‘Cosmos’ Update

Fox’s new version of “Cosmos,” the 1980 mini-series from Carl Sagan, will have Seth MacFarlane as a producer and revisit Sagan’s explorations of existence at its most massive and microscopic.
From the Book Review

‘The Theory That Would Not Die’

The controversial history of the mathematical theorem that tells us when we should change our minds.
Science Columns
Q & A

The Pink and the Blue

The plant’s color is determined by the aluminum it does or does not absorb through its roots.
OBSERVATORY

Tracing Social Networks of the Asian Elephant

New research shows that while Asian elephants may change their day-to-day associations, they maintain a larger, stable network from which they pick their companions.
OBSERVATORY
The Marcgravia evenia plant has dish-shaped leaves that bounce back echoes that bats can identify through echolocation.

A Vine’s Acoustics Send a Bat Signal

The plant, Marcgravia evenia, has dish-shaped leaves that reflect sounds especially well, making it easy for bats to identify it though echolocation.
OBSERVATORY
Tree rings can help estimate past climate reliably — unless sheep are involved.

Nibblers Affect Climate Tales That Tree Rings Tell

Analyzing past climate conditions using tree rings is complicated when the trees have been food for animals, researchers have found.
Podcast: Science Times
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This week: A race to the bottom of the ocean, an extinct marsupial comes to life and the psychology of addiction.
Health Columns
PERSONAL HEALTH
FASTER THAN AN OPERATION The triangular forearm support may relieve shoulder pain in those with injured rotator cuffs.

Ancient Moves for Orthopedic Problems

It pays to know about methods of prevention and treatment for orthopedic problems that are low-cost and rely almost entirely on self-care.
REALLY?

The Claim: A Normal Heart Rate Is 60 to 100 Beats a Minute

Some researchers believe that an increased risk of stroke and heart disease at the upper end of that range may mean it's time to re-examine what's considered normal.

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