Κυριακή, 25 Μαΐου 2014

ScienceDaily: Most Popular News

ScienceDaily: Most Popular News


Failed dwarf galaxy survives galactic collision thanks to full dark-matter jacket

Posted: 23 May 2014 11:51 AM PDT

Like a bullet wrapped in a full metal jacket, a high-velocity hydrogen cloud hurtling toward the Milky Way appears to be encased in a shell of dark matter, according to a new analysis. Astronomers believe that without this protective shell, the high-velocity cloud known as the Smith Cloud would have disintegrated long ago when it first collided with the disk of our Galaxy.

NASA's WISE findings poke hole in black hole 'doughnut' theory

Posted: 22 May 2014 01:23 PM PDT

A survey of more than 170,000 supermassive black holes, using NASA's Wide-field Infrared Survey Explorer (WISE), has astronomers reexamining a decades-old theory about the varying appearances of these interstellar objects. The unified theory of active, supermassive black holes, first developed in the late 1970s, was created to explain why black holes, though similar in nature, can look completely different. Some appear to be shrouded in dust, while others are exposed and easy to see.

New 'T-ray' tech converts light to sound for weapons detection, medical imaging

Posted: 22 May 2014 12:05 PM PDT

A device that essentially listens for light waves could help open up the last frontier of the electromagnetic spectrum -- the terahertz range. So-called T-rays, which are light waves too long for human eyes to see, could help airport security guards find chemical and other weapons. They might let doctors image body tissues with less damage to healthy areas. And they could give astronomers new tools to study planets in other solar systems. Those are just a few possible applications.

Fruit flies show mark of intelligence in thinking before they act, study suggests

Posted: 22 May 2014 11:14 AM PDT

Fruit flies 'think' before they act, a study suggests. Neuroscientists showed that fruit flies take longer to make more difficult decisions. In experiments asking fruit flies to distinguish between ever closer concentrations of an odor, the researchers found that the flies don't act instinctively or impulsively. Instead they appear to accumulate information before committing to a choice.

Ancient DNA ends Australia's claim to kiwi origins

Posted: 22 May 2014 11:13 AM PDT

Australia can no longer lay claim to the origins of the iconic New Zealand kiwi following new research showing the kiwi's closest relative is not the emu as was previously thought. Instead, the diminutive kiwi is most closely related to the extinct Madagascan elephant bird -- a 2-3 meter tall, 275 kg giant. And surprisingly, the study concluded, both of these flightless birds once flew.

Blocking pain receptors extends lifespan, boosts metabolism in mice

Posted: 22 May 2014 09:35 AM PDT

Chronic pain is known to shorten lifespan, and pain tends to increase with age. But is there a relationship between pain and longevity? Researchers have found that mice lacking the capsaicin pain receptor live around 14 percent longer than other mice, and they retain a more youthful metabolism as well. Receptor blockers could not only relieve pain, but increase lifespan, improve metabolic health and help diabetics and the obese.

First broadband wireless connection ... to the moon: Record-shattering Earth-to-Moon uplink

Posted: 22 May 2014 07:49 AM PDT

Scientists have prepared new details and the first comprehensive overview of the on-orbit performance of their record-shattering laser-based communication uplink between the moon and Earth, which beat the previous record transmission speed last fall by a factor of 4,800.

Devastating human impact on the Amazon rainforest revealed

Posted: 22 May 2014 07:48 AM PDT

The human impact on the Amazon rainforest has been grossly underestimated according to an international team of researchers. They found that selective logging and surface wildfires can result in an annual loss of 54 billion tons of carbon from the Brazilian Amazon, increasing greenhouse gas emissions. This is equivalent to 40% of the yearly carbon loss from deforestation -- when entire forests are chopped down.

Top ten new species for 2014

Posted: 22 May 2014 04:33 AM PDT

An international committee selected the top 10 from among the approximately 18,000 new species named during the previous year. The list includes a quartet of tiny newcomers to science: a miniscule skeleton shrimp from Santa Catalina Island in California, a single-celled protist that does a credible imitation of a sponge, a clean room microbe that could be a hazard during space travel and a teensy fringed fairyfly named Tinkerbell.

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