Usher, Shakira, Adam and Blake can finally keep their chairs forward for the season.
By Emilee Lindner
Usher on "The Voice"
Photo: NBC
Source: http://www.mtv.com/news/articles/1705296/the-voice-teams.jhtml
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The custom-built "roleplay" system was designed and implemented by Eric Martindale as of July 2009. All attempts to replicate or otherwise emulate this system and its method of organizing roleplay are strictly prohibited without his express written and contractual permission; violators will be prosecuted to the fullest extent of the law.
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President Barack Obama gestures during his meeting with Singapore Prime Minister Lee Hsien Loong in the Oval Office of the White House in Washington, Tuesday, April, 2, 2013. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama gestures during his meeting with Singapore Prime Minister Lee Hsien Loong in the Oval Office of the White House in Washington, Tuesday, April, 2, 2013. (AP Photo/Pablo Martinez Monsivais)
WASHINGTON (AP) ? In danger of losing congressional momentum, President Barack Obama is drawing attention to Colorado's newly passed gun control laws as he applies public pressure on Congress to pass similar federal measures.
Obama was traveling to the Denver suburbs Wednesday, stepping up his call for universal background checks for gun buyers as well as his demands for Congress to at least vote on an assault weapons ban and limits on large-capacity ammunition magazines.
The trip is heavy with political symbolism. Colorado expanded background checks and placed restrictions on magazines despite being a state with a deep-rooted hunting tradition, where gun ownership is a cherished right. Moreover, Obama will meet with law enforcement officials and community leaders at the Denver Police Academy, not far from the Aurora suburb where a gunman last summer killed 12 people in a movie theater. The president's trip is occurring in the same week that prosecutors announced they would seek the death penalty for James Holmes, accused of carrying out the Aurora rampage.
With Congress due to return to Washington after a two-week Easter break, Obama has been scheduling high-profile events on gun legislation to push lawmakers and sustain a drive for some kind of action aimed at curbing gun violence more than three months after the massacre at a Newtown, Conn., elementary school.
Last week Obama called for legislation while flanked by 21 mothers who have lost children to gun violence. "I haven't forgotten those kids," he declared then.
On Monday, just ahead of the planned start of the Senate's debate on gun legislation, Obama is scheduled to go to Hartford, Conn., where state lawmakers have announced a bipartisan agreement on gun legislation as a response to the shootings at Newtown's Sandy Hook Elementary School, which took the lives of 20 first-graders and six adult staff.
"If it were simple to pass measures through Congress that are very common sense but would reduce gun violence in America, those measures would have passed already," White House spokesman Jay Carney said Tuesday. "And the president has always recognized that this is something that would be a challenge."
In selecting Colorado, Obama is showcasing a state with a long centrist tradition that prizes its Western frontier heritage. But an influx of young coastal transplants and growing Hispanic voter clout have helped Democrats win a string of victories in the state. Even before the Sandy Hook massacre energized gun control proponents, Democratic Gov. John Hickenlooper said he was open to new gun control measures in the state.
Colorado Republicans fought the new legislation, contending that Democrats overreached and will be punished by the voters in November. Several county sheriffs have vowed not to enforce the new gun restrictions. Democrats contend that the measures are generally popular, especially among the suburban women who decide Colorado elections.
Obama's trip comes a day after a study commissioned by the National Rifle Association, which has opposed Obama's gun control measures, recommended that schools have trained, armed staffers to increase security for students. The American Federation of Teachers denounced the proposal.
With just days left before the Senate begins its debate, there were signs that sweeping congressional efforts to address gun violence have flagged.
A proposed ban on assault weapons has little hope of passage and the prospects for barring large-capacity magazines also seem difficult. Key senators have been unable to reach a bipartisan compromise that would require federal background checks for gun transactions between private individuals. Federal background checks currently apply only to sales handled by licensed gun dealers.
Carney said administration officials were looking for middle ground.
"We are working with lawmakers of both parties, and trying to achieve a compromise that can make this happen. Especially when it comes to the background checks," Carney told reporters. But he reiterated Obama's insistence that other measures get a vote.
In addition to his stop in Denver, Obama will travel to San Francisco to attend fundraisers Wednesday and Thursday for Democratic Party organizations.
___
Associated Press writers Nicholas Riccardi in Denver and Alan Fram in Washington contributed to this report.
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Apr. 2, 2013 ? Spiral galaxies are some of the most beautiful and photogenic residents of the universe. Our own Milky Way is a spiral. Our solar system and Earth reside somewhere near one of its filamentous arms. And nearly 70 percent of the galaxies closest to the Milky Way are spirals.
But despite their common shape, how galaxies like ours get and maintain their characteristic arms has proved to be an enduring puzzle in astrophysics. How do the arms of spiral galaxies arise? Do they change or come and go over time?
The answers to these and other questions are now coming into focus as researchers capitalize on powerful new computer simulations to follow the motions of as many as 100 million "stellar particles" as gravity and other astrophysical forces sculpt them into familiar galactic shapes. A team of researchers from the University of Wisconsin-Madison and the Harvard-Smithsonian Center for Astrophysics reports simulations that seem to resolve long-standing questions about the origin and life history of spiral arms in disk galaxies.
"We show for the first time that stellar spiral arms are not transient features, as claimed for several decades," says UW-Madison astrophysicist Elena D'Onghia, who led the new research along with Harvard colleagues Mark Vogelsberger and Lars Hernquist.
"The spiral arms are self-perpetuating, persistent, and surprisingly long lived," adds Vogelsberger.
The origin and fate of the emblematic spiral arms in disk galaxies have been debated by astrophysicists for decades, with two theories predominating. One holds that the arms come and go over time. A second and widely held theory is that the material that makes up the arms -- stars, gas and dust -- is affected by differences in gravity and jams up, like cars at rush hour, sustaining the arms for long periods.
The new results fall somewhere in between the two theories and suggest that the arms arise in the first place as a result of the influence of giant molecular clouds -- star forming regions or nurseries common in galaxies. Introduced into the simulation, the clouds act as "perturbers" and are enough to not only initiate the formation of spiral arms but to sustain them indefinitely.
"We find they are forming spiral arms," explains D'Onghia. "Past theory held the arms would go away with the perturbations removed, but we see that (once formed) the arms self-perpetuate, even when the perturbations are removed. It proves that once the arms are generated through these clouds, they can exist on their own through (the influence of) gravity, even in the extreme when the perturbations are no longer there."
The new study modeled stand-alone disk galaxies, those not influenced by another nearby galaxy or object. Some recent studies have explored the likelihood that spiral galaxies with a close neighbor (a nearby dwarf galaxy, for example) get their arms as gravity from the satellite galaxy pulls on the disk of its neighbor.
According to Vogelsberger and Hernquist, the new simulations can be used to reinterpret observational data, looking at both the high-density molecular clouds as well as gravitationally induced "holes" in space as the mechanisms that drive the formation of the characteristic arms of spiral galaxies.
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Apr. 3, 2013 ? The rare Green Pea galaxies discovered by the general public in 2007 could help confirm astronomers' understanding of reionization, a pivotal stage in the evolution of the early universe, say University of Michigan researchers.
Reionization occurred a few hundred million years after the Big Bang as the first stars were turning on and forming the first galaxies. During this period, the space between the galaxies changed from an opaque, neutral fog to a transparent charged plasma, as it is today. Plasma is gas that's electrically charged.
As for how this happened, the prevailing theory holds that massive stars in the early galaxies produced an abundance of high-energy ultraviolet light that escaped into intergalactic space. There, the UV light interacted with the neutral hydrogen gas it met, blasting electrons off the hydrogen atoms and leaving behind a plasma of negatively charged electrons and positively charged hydrogen ions.
"We think this is what happened but when we looked at galaxies nearby, the high-energy radiation doesn't appear to make it out. There's been a push to find some galaxies that show signs of radiation escaping," said Anne Jaskot, a doctoral student in astronomy.
Jaskot and Sally Oey, an associate professor of astronomy in the College of Literature, Science, and the Arts, have found that the Green Peas could hold that evidence. Their findings are published in the current edition of the Astrophysical Journal.
"The Green Peas are compact, highly star-forming galaxies that are very similar to the early galaxies in the universe," Jaskot said. "Our analysis shows they may be leaking ionizing radiation."
The researchers focused on six of the most intensely star-forming Green Pea galaxies, which are between one billion and five billion light years away. They studied their emission lines as observed by the Sloan Digital Sky Survey. Emission lines show how light interacts with matter, and in this case, they helped the astronomers understand the relationship between the stars and gas in these galaxies.
The emission lines told Jaskot and Oey how much light the galaxies absorbed. Then, to determine how much light was there to start with, they ran models to estimate, for example, how old the galaxies are and how many stars they contain. The galaxies, the researchers determined, produced more radiation than the researchers detected, so they infer that some of it must have escaped.
"An analogy might be if you have a tablecloth and you spill something on it. If you see the cloth has been stained all the way to the edges, there's a good chance it also spilled onto the floor," Jaskot said. "We're looking at the gas like the tablecloth and seeing how much light it has absorbed. It has absorbed a lot of light. We're seeing that the galaxy is saturated with it and there's probably some extra that spilled off the edges."
Jaskot says the Green Peas are exciting candidates to help astronomers understand a major milestone in the development of the cosmos 13 billion years ago.
The paper is called "The Origin and Optical Depth of Ionizing Radiation in the 'Green Pea' Galaxies. The research is funded by the National Science Foundation.
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3 years ago today, Apple shipped the original iPad Wi-Fi. It had been called unimaginative. It had been called unnecessary. Even after Steve Jobs had taken the stage only a few months earlier and made the case that there was room for a new product category between the smartphone and the laptop, even after Apple's multitouch interface had mainstreamed computing like never before, it was called "just a big iPhone".
And it was. An iPhone gone IMAX. Widescreen experiences gone tall screen. Single column apps gone double column. Small device gone big.
If analysts didn't get it, if pundits didn't get it, if everyone inside Apple didn't get the full extent of it, it didn't matter. We got it. By the millions. Tens of millions.
It was early days still, before they were comfortable enough to have Peter Coyote say technology alone wasn't enough.
But even in its original form, the iPad made computing accessible to people for whom even Macs were confusing and intimidating, for whom mice and keyboards were awkward and off-putting, for whom multiple windows were frustrating and disorienting, for whom everything about a personal computers was still far too impersonal.
It empowered them.
Three years later, with the web in the palm of our hands, with games and videos that fill our field of vision, with apps that let us finger-paint with productivity and pinch and swipe and tap information around the world, with sizes both full and mini, the iPad is a success.
Undeniably, phenomenally, transformative-ly, confounding-ly a success.
And it's only been three years. How far can the iPad go in another three?
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Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/3aqw0roAMrc/story01.htm
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Two studies of vacuums suggest that the speed of light in a vacuum might fluctuate, pointing the way to a quantum mechanical explanation for why the speed of light and other so-called constants are what they are.
A young person attempts to navigate a laser maze during the grand opening ceremony for the Angry Birds Space Encounter at the Kennedy Space Center earlier this month. Researchers say that the speed of light in a vacuum, long thought to be a universal constant, may actually fluctuate.
Malcolm Denemark/Florida Today/AP
EnlargeWhere did the speed of light in a vacuum come from? Why is it 299,792,458 meters per second and not some other figure?
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The simple answer is that, since 1983, science has defined a meter by the speed of light: one meter equals the distance light travels in one?299,792,458th of a second.?But that doesn't really answer our question. It's just the physics equivalent of saying, "Because I said so."?
Unfortunately, the deeper answer has been equally unsatisfying: The speed of light in a vacuum, according to physics textbooks, just is. It's a constant, one of those numbers that defines the universe. That's the physics equivalent of saying, "Because the cosmos said so."?
Or did it? A pair of studies suggest that this universal constant?might not be so constant after all. In the first study, Marcel Urban from the University of Paris-Sud and his team found that the speed of light in a vacuum varies ever so slightly.
This happens because what we think of as nothing isn't really nothing. Even if you were to create a perfect vacuum, at the quantum level it would still be populated with pairs of tiny "virtual" particles that flash in and out of existence and whose energy values fluctuate. As a consequence of these fluctuations, the speed of a photon passing through a vacuum varies, about?50 quintillionths of a second per square meter.
That may not sound like much, but it's enough to point the way toward a new underlying physics.
Before 1905, when?Albert Einstein formulated his special theory of relativity, scientists regarded space and time as composing the backdrop of the universe, the immovable stage upon which motion takes place. The only problem with this model is that light seems to move at the same speed regardless of the speed of the source, creating an apparent paradox. Einstein's theory resolved this paradox by replacing Newton's absolutes of time and space with a single absolute, the speed of light.
But if even that can vary, what's left for us to hang our hat on? Nothing, it turns out.
But, as we just noted, nothing is something. Urban's paper suggests that the speed of light and other constants "are not fundamental constants but observable parameters of the quantum vacuum." In other words, the speed of light emerges from the properties of particles in the vacuum.
In the other paper, physicists?Gerd Leuchs and Luis L. S?nchez-Soto, from the Max Planck Institute for the Physics of Light in Erlangen, Germany, hypothesize how this emergence occurs. They suggest that the impedance of a vacuum ? another electromagnetic 'constant' whose value depends on the speed of light ? itself depends only on the electric charge of the particles in the vacuum, and not their masses.
If their hypothesis is correct, it answers our question of where the speed of light comes from: It emerges from the total number of charged particles in the universe.?
Time will tell if this hypothesis is correct. And of course, by "time," we mean "space and time," by which we mean "the speed of light," by which we mean "nothing," by which we mean "the properties of the quantum vacuum." But in the meantime ? or whatever ? you can thank us for informing you that, as the speed of light in a vacuum continues to fluctuate, so too does the length of the meter. Think nothing of it.?
Source: http://rss.csmonitor.com/~r/feeds/science/~3/JZLe20Gk_Iw/Scientists-examine-nothing-find-something
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