Thursday, April 11, 2013

Did orbiting antimatter detecter spot signs of dark matter?

Mounted on the outside of the International Space Station since 2011,?the Alpha Magnetic Spectrometer has detected antimatter within the stream of cosmic rays that appear consistent with our models of dark matter.

By Nancy Atkinson,?Universe Today / April 3, 2013

The newly-installed Alpha Magnetic Spectrometer-2 is visible at center of the International Space Station's starboard truss.

NASA

Enlarge

The first results from the largest and most complex scientific instrument on board the International Space Station has provided tantalizing hints of nature?s best-kept particle secrets, but a definitive signal for dark matter remains elusive. While the Alpha Magnetic Spectrometer (AMS) has spotted millions of particles of antimatter ? with an anomalous spike in positrons ? the researchers can?t yet rule out other explanations, such as nearby pulsars.

Skip to next paragraph

' + google_ads[0].line2 + '
' + google_ads[0].line3 + '

'; } else if (google_ads.length > 1) { ad_unit += ''; } } document.getElementById("ad_unit").innerHTML += ad_unit; google_adnum += google_ads.length; return; } var google_adnum = 0; google_ad_client = "pub-6743622525202572"; google_ad_output = 'js'; google_max_num_ads = '1'; google_feedback = "on"; google_ad_type = "text"; google_adtest = "on"; google_image_size = '230x105'; google_skip = '0'; // -->

?These observations show the existence of new physical phenomena,? said AMS principal investigator Samuel Ting, ?and whether from a particle physics or astrophysical origin requires more data. Over the coming months, AMS will be able to tell us conclusively whether these positrons are a signal for dark matter, or whether they have some other origin.?

The AMS was brought to the ISS in 2011 during the final flight of space shuttle Endeavour, the penultimate shuttle flight. The $2 billion experiment examines ten thousand cosmic-ray hits every minute, searching for clues into the fundamental nature of matter.

During the first 18 months of operation, the AMS collected of 25 billion events. It found an anomalous excess of positrons in the cosmic ray flux ? 6.8 million are electrons or their antimatter counterpart, positrons.

The AMS found the ratio of positrons to electrons goes up at energies between 10 and 350 gigaelectronvolts, but Ting and his team said the rise is not sharp enough to conclusively attribute it to dark matter collisions. But they also found that the signal looks the same across all space, which would be expected if the signal was due to dark matter ? the mysterious stuff that is thought to hold galaxies together and give the Universe its structure.

Additionally, the energies of these positrons suggest they might have been created when particles of dark matter collided and destroyed each other.

The AMS results are consistent with the findings of previous telescopes, like the Fermi and PAMELA gamma-ray instruments, which also saw a similar rise, but Ting said the AMS results are more precise.

The results released today do not include the last 3 months of data, which have not yet been processed.

?As the most precise measurement of the cosmic ray positron flux to date, these results show clearly the power and capabilities of the AMS detector,? Ting said.

Cosmic rays are charged high-energy particles that permeate space. An excess of antimatter within the cosmic ray flux was first observed around two decades ago. The origin of the excess, however, remains unexplained. One possibility, predicted by a theory known as supersymmetry, is that positrons could be produced when two particles of dark matter collide and annihilate. Ting said that over the coming years, AMS will further refine the measurement?s precision, and clarify the behavior of the positron fraction at energies above 250 GeV.

Although having the AMS in space and away from Earth?s atmosphere ? allowing the instruments to receive a constant barrage of high-energy particles ? during the press briefing, Ting explained the difficulties of operating the AMS in space. ?You can?t send a student to go out and fix it,? he quipped, but also added that the ISS?s solar arrays and the departure and arrival of the various spacecraft can have an effect on thermal fluctuations the sensitive equipment might detect. ?You need to monitor and correct the data constantly or you are not getting accurate results,? he said.

Despite recording over 30 billion cosmic rays since AMS-2 was installed on the International Space Station in 2011, the Ting said the findings released today are based on only 10% of the readings the instrument will deliver over its lifetime.

Asked how much time he needs to explore the anomalous readings, Ting just said, ?Slowly.? However, Ting will reportedly provide an update in July at the International Cosmic Ray Conference.

More info:?CERN press release, the team?s paper:?First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5?350 GeV

Nancy Atkinson is Universe Today's Senior Editor. She also is the host of the?NASA Lunar Science Institute podcast?and works with the?Astronomy Cast?and?365 Days of Astronomy?podcasts. Nancy is also a NASA/JPL Solar System Ambassador.

Connect with Nancy on?Facebook?|?Twitter?|?Google +?|?Website

Source: http://rss.csmonitor.com/~r/feeds/science/~3/lBYFvgAaVdg/Did-orbiting-antimatter-detecter-spot-signs-of-dark-matter

rand paul Iron Man 3 Lauren Silberman Sim City Manchester United Alvin Lee nicki minaj

Why Sighing Makes You Feel Better

Why Sighing Makes You Feel BetterWhether it's a sigh of relief, or a sigh of grief, we all sigh throughout the day. But what's the actual purpose of sighing? Psychology Today points to a few studies that suggest it's not only a sign of communication, but it's also a breathing method that makes us feel better.

A sigh can have all types of meanings. It might be a sign of sadness, frustration, or even plain old annoyance. One study suggests that sighing tends to have a soothing effect on the person actually doing it. Psychology Today describes it like so:

By studying breathing patterns of participants for 20 minutes while sitting quietly, the authors found that during the time preceding a sigh, breathing begins to vary, changing in speed or shallowness.

When breathing in one state for too long, Vlemincx says, the lungs become stiffer and less efficient in gas exchange. Intermittently adding a sigh to the normal pattern, then, stretches the lung's air sacs (alveoli). This feeling may give one a sense of relief.

That said, we don't perceive a sigh the same way in others as we see it in ourselves. In one experiment, researchers asked participants to also share what they thought when other people sighed:

In each of the four cases, participants imagined people to be sighing out of negative feelings ten times more often than for positive reasons. Furthermore, when others sigh, it's perceived as sadness?but when we sigh, we do so out of frustration.

A sigh is one of those subtle cues we all give off, and if you're ever in a conversation where someone sighs, it might be a good idea to second-guess your intuition that they're sad about something.

Why Do We Sigh? | Psychology Today

Photo by Teeejayy.

Source: http://feeds.gawker.com/~r/lifehacker/full/~3/8SCFZU8sJx8/why-sighing-makes-you-feel-better

at the drive in alternative minimum tax modeselektor gran torino gloria steinem war of the worlds rock and roll hall of fame

Senators announce gun deal, raising hopes of Senate passage

By Kasie Hunt & Michael O'Brien, Political Reporters, NBC News

?

A bipartisan pair of senators introduced a compromise proposal to expand background checks on Wednesday, an agreement which could form the basis for major gun control legislation to potentially pass through Congress.

Sens. Pat Toomey, R-Pa., and Joe Manchin, D-W.Va. ? who both enjoy top ratings from the National Rifle Association ? outlined an agreement that would expand background checks to include most firearms sales, including those at gun shows and online.

While the new framework does not go quite as far as the stricter gun controls first advocated by President Barack Obama in the wake of December?s Newtown, Conn., shootings, it paves the path for Senate approval of one of the president?s major second term initiatives.

?Truly, the events of Newtown changed us all,? Manchin said at a press conference announcing the agreement. ?This amendment won't ease the pain ... but nobody here ? and I mean not one of us in this great Capitol of ours ? can sit by and not try to prevent a day like that from happening again.?

Manuel Balce Ceneta / AP

Sens. Chuck Schumer and Joe Manchin speak to reporters in Washington on April 9, 2013, after a meeting on gun control.

The agreement won the support of a key proponent of new gun legislation, New York Sen. Charles Schumer, the No. 2 Senate Democrat who said he planned to co-sponsor the new agreement. Schumer called Vice President Joe Biden, New York City Mayor Michael Bloomberg, Mark Kelly (the husband of former Rep. Gabrielle Giffords, D-Ariz.) and various gun safety groups to urge them to support the compromise, as well.

The background check deal made several tweaks to the prior Democratic proposal, namely by striking a provision requiring states to recognize concealed carry permits from other states, and eliminating another measure exempting sellers who sell five guns per year or fewer from the background check requirement.

The proposal also includes other provisions meant to allay gun-rights advocates' concerns about background checks. Namely, the legislation would not require background checks for intra-family transfers of firearms, and would apply existing record-keeping rules used for gun stores to those weapons sold online or at gun shows.

But the NRA quickly criticized the new proposal as inadequate, a pronouncement which could influence the decision-making of wavering lawmakers.

?Expanding background checks at gun shows will not prevent the next shooting, will not solve violent crime and will not keep our kids safe in schools,? said the gun rights group. ?The sad truth is that no background check would have prevented the tragedies in Newtown, Aurora or Tucson.?

Still, the bipartisan nature of the agreement could improve prospects for its approval by the entire Senate, especially if the Obama administration should throw its weight behind the proposal. Support from Toomey (as well as Illinois Sen. Mark Kirk, another swing-state Republican) could entice other GOP senators to support the compromise.

?I?m a gun owner, and the rights that are enshrined in the Second Amendment are very, very important to me personally,? Toomey said alongside Manchin on Capitol Hill. ?But I?ve got to tell you, candidly, that I don?t consider criminal background checks to be gun control. I think it?s just common sense.?

The first test of that support will come on Thursday, when Senate Majority Leader Harry Reid, D-Nev., said he planned to hold a key vote to move forward with the gun debate. A group of conservative senators ? including Senate Minority Leader Mitch McConnell, R-Ky. ? had vowed to filibuster any gun legislation, though their ability to wage one successfully was undercut by several other Republicans, who said they would not support such a maneuver.

Senators Joe Manchin, D-W.Va., and Pat Toomey, R-Pa., detail their bipartisan agreement on background checks relating to gun purchases.

Already, groups on opposite sides of the gun debate have aligned for or against the Manchin-Toomey proposal.

Americans for Responsible Solutions, the group founded by Kelly to support gun control, said it was ?pleased? by the new agreement.

?We will do everything in our power to ensure that Americans know about the determined leadership of Sen. Manchin, a conservative Democrat, and Senator Toomey ... to keep this common sense legislation moving,? said Pia Carusone, the group?s executive director.

But the conservative Heritage Action also issued a statement on opposition to the gun deal, a declaration that could weigh heavily on Republicans in the House, where any Senate legislation awaits an uncertain future.

House Speaker John Boehner, R-Ohio, talking on Wednesday about the forthcoming Senate accord, was noncommittal about bringing up a prospective gun bill for a vote.

"As I've made clear, any bill that passes the Senate, we're going to review it. In the meantime, we're going to continue to have hearings looking at the source of violence in our country," Boehner said at a press conference. "It's one thing for two members to come to some agreement; it doesn't substitute the will of the other 98 members."

Raising hope, though, for House support was another bipartisan pairing, Reps. Mike Thompson, D-Calif., and Peter King, R-N.Y., who hailed the Manchin-Toomey agreement, and said they planned to work to introduce similar legislation in the lower chamber.?

"This legislation is enforceable, it will save lives, and it respects the Second Amendment rights of law abiding Americans," the lawmakers said in a joint statement.

This story was originally published on

Source: http://feeds.nbcnews.com/c/35002/f/653381/s/2a912e17/l/0Lfirstread0Bnbcnews0N0C0Inews0C20A130C0A40C10A0C176888320Esenators0Eannounce0Egun0Edeal0Eraising0Ehopes0Eof0Esenate0Epassage0Dlite/story01.htm

ostara masters 2012 andy kaufman tom watson kawasaki disease resurrection masters tickets

S&P raises Cyprus rating outlook to stable from negative

NICOSIA (Reuters) - Standard & Poor's Ratings Services on Wednesday raised its outlook on Cyprus to stable from negative, saying it expects the troubled government to agree to the terms of a bailout, averting any immediate risk of a sovereign default.

Cyprus, one of the euro zone's smallest economies, has been forced to wind down one of its largest banks and slap losses on uninsured deposits in a second in order to qualify for a 10 billion euro (8.53 billion pounds) lifeline from the European Union and the International Monetary Fund.

S&P rates the island CCC. It said it would likely lower the rating if, contrary to its expectations, the Cypriot government rejected the bailout terms. It would consider raising the rating if the economy were to stabilise sooner and at higher levels.

"Our baseline expectation continues to be that Cyprus will remain a member of the euro zone. Nevertheless, it seems likely that recently imposed capital controls will remain, in some form, to protect Cyprus' banks from renewed deposit flight," S&P said.

Cypriot authorities imposed capital restrictions on banks on March 28, introducing a vetting process for payments over 25,000 euros daily by businesses and setting a 300 euro cash withdrawal limit for individuals.

Standard and Poor's said it expected Cyprus's economy to shrink 20 percent from 2013 to 2016. Expected downsizing in the public and financial services sector, and in the banking system would likely lead to significant job losses, it said.

Cyprus plans to raise 10.6 billion euros from winding down Laiki Bank, losses to junior bondholders, and a deposit-for-equity swap for uninsured deposits in the Bank of Cyprus, a draft assessment of Cypriot financing needs prepared by the European Commission showed. It also plans to sell 400 million euros' worth of reserves to finance part of its bailout.

S&P said that it understood that once terms were approved by the Cypriot government, the ECB would once again accept Cypriot government securities as collateral in exchange for its credit support to Cyprus's financial institutions.

"We view this as an important normalisation of monetary support for Cyprus's challenged financial sector," it said.

Under the terms of the bailout deal, Cyprus's economy is expected to contract 8.7 percent this year, continue to shrink in 2014 and return to marginal growth in 2015, documents seen by Reuters show.

(Reporting By Hilary Russ and Michele Kambas; Editing by Hugh Lawson)

Source: http://news.yahoo.com/p-revises-cyprus-outlook-stable-negative-164557747--finance.html

dan savage new world trade center kellen moore octomom stoudemire jordan hill tony nominations

Wednesday, April 10, 2013

Justin Bieber Haircut: Love It or Loathe It?

Source:

Superbowl Start Time Jim Harbaugh Who Won The Superbowl Super Bowl Halftime Show 2013 Super Bowl Commercials 2013 Ray Lewis Murders 2013 Super Bowl Commercials

Hammad Memon attorneys seek second extension for mental health ...

HUNTSVILLE, Alabama -- Hammad Memon's attorneys have asked for a second extension in filing the defense's mental health evaluation of the teen whose murder trial is set for June.
The mental state of Memon is expected to be a key piece of the defense's case as Memon, 17, faces a murder charge in the killing of his Discovery Middle School classmate Todd Brown on Feb. 5, 2010. Both Memon and Brown were 14 at the time of the shooting.
The mental health evaluation was due last week but Madison County Circuit Judge Karen Hall granted an extension until Monday following a defense request.
Memon's Birmingham-based attorney James Parkman filed a second extension request today. asking that the court allow the report to be submitted Wednesday.
In making today's request Parkman said Dr. Paul O'Leary was in a car accident Sunday. There was no mention in the court filing if O'Leary,? a Birmingham-based psychiatrist, was injured.
Court records did not indicate if Hall had granted the motion.
Memon's trial is set for June 17.
His attorneys have indicated he will be pursuing an insanity defense, that at the time of the shooting his mental condition did not allow him to appreciate the nature and wrongfulness of his actions.

Source: http://blog.al.com/breaking/2013/04/hammad_memon_attorneys_ask_for.html

montrose marshawn lynch earthquake bay area clear channel drexel dale george will

Tuesday, April 9, 2013

All about immigration: Green cards? Citizenship?

WASHINGTON (AP) ? This may be the year Congress decides what to do about the millions of immigrants living illegally in the U.S. And this may be the week when a bipartisan group of senators makes public details of the overhaul plan it has been negotiating for months.

But what will that be? Why now? And who are all these immigrants, once you get past the big round numbers?

A big dose of facts, figures and other information to help understand the current debate over immigration:

___

WHY NOW?

Major problems with U.S. immigration have been around for decades.

President George W. Bush tried to change the system and failed. President Barack Obama promised to overhaul it in his first term but never did.

In his second term, he's making immigration a priority, and Republicans also appear ready to deal.

Why the new commitment?

Obama won 71 percent of Hispanic voters in his 2012 re-election campaign, and he owes them. Last year's election also sent a loud message to Republicans that they can't ignore this pivotal voting bloc.

It's been the kind of breathtaking turnaround you rarely see in politics. Plus, there's growing pressure from business leaders, who want to make it easier for the U.S. to attract highly educated immigrants and to legally bring in more lower-skilled workers such as farm laborers.

___

WHAT'S THE PROBLEM?

Talk about "comprehensive immigration reform" generally centers on four main questions:

?What to do about the 11 million-plus immigrants who live in the U.S. without legal permission.

?How to tighten border security.

?How to keep businesses from employing people who are in the U.S. illegally.

?How to improve the legal immigration system, now so convoluted that the adjective "Byzantine" pops up all too frequently.

___

WHAT'S THE GANG OF EIGHT?

A group of four Democrats and four Republicans in the Senate, taking the lead in trying to craft legislation that would address all four questions.

Obama is preparing his own plan as a backup in case congressional talks fail. There's also a bipartisan House group working on draft legislation, but House Republican leaders may leave it to the Senate to make the first move.

___

COMING TO AMERICA

A record 40.4 million immigrants live in the U.S., representing 13 percent of the population. More than 18 million are naturalized citizens, 11 million are legal permanent or temporary residents, and more than 11 million are in the country without legal permission, according to the Pew Hispanic Center, a private research organization.

Those in the U.S. illegally made up about 3.7 percent of the U.S. population in 2010. While overall immigration has steadily grown, the number of immigrants in the U.S. illegally peaked at 12 million in 2007.

___

WE'RE NO. 1

The U.S. is the leading destination for immigrants. Russia's second, with 12.3 million, according to Pew.

___

WHERE FROM?

Twenty-nine percent of the foreign-born in the U.S., or about 11.7 million people, came from Mexico. About 25 percent came from South and East Asia, 9 percent from the Caribbean, 8 percent from Central America, 7 percent South America, 4 percent the Middle East and the rest from elsewhere.

The figures are more lopsided for immigrants living here illegally: An estimated 58 percent are from Mexico. The next closest figure is 6 percent from El Salvador, says the government.

___

WHERE TO?

California has the largest share of the U.S. immigrant population, 27 percent, followed by New York, New Jersey, Florida, Nevada, Hawaii and Texas, according to the Migration Policy Institute, a private group focused on global immigration issues.

California has the largest share of immigrants in the U.S. illegally, at 25 percent, followed by Texas with 16 percent. Florida and New York each has 6 percent, and Georgia has 5 percent, according to the Department of Homeland Security.

___

GETTING IN

Here's one way to think about the ways immigrants arrive in the U.S: Some come in the front door, others the side door and still others the back door, as laid out in a report from the private Population Reference Bureau.

?Arriving through the front door: people legally sponsored by their families or employers. Also refugees and asylum-seekers, and immigrants who win visas in an annual "diversity" lottery.

?Side door: legal temporary arrivals, including those who get visas to visit, work or study. There are dozens of types of nonimmigrant visas, available to people ranging from business visitors to foreign athletes and entertainers. Visitors from dozens of countries don't even need visas.

?Back door: Somewhat more than half of those in the U.S. illegally have come in the back door, evading border controls, Pew estimates. The rest legally entered, but didn't leave when they were supposed to or otherwise violated terms of their visas.

___

HOW DO WE KNOW?

It's widely accepted that there are more than 11 million immigrants in the U.S. illegally.

But how do we know that?

Those who are living here without permission typically aren't eager to volunteer that information. Number-crunchers dig into census data and other government surveys, make some educated assumptions, adjust for people who may be left out, mix in population information from Mexico and tend to arrive at similar figures.

The Department of Homeland Security estimates there were 11.5 million immigrants living in the U.S. illegally in January 2011. Pew puts the number at 11.1 million as of March 2011.

Demographers use what's called the "residual" method to get their tally. They take estimates of the legal foreign-born population and subtract that number from the total foreign-born population. The remainder represents those who are living in the country without legal permission.

___

IS IT A CRIME?

Simply being in the United States in violation of immigration laws isn't, by itself, a crime; it's a civil violation.

Entering the country without permission is a misdemeanor criminal offense. Re-entering the country without authorization after being formally removed can be felony.

Pew estimates that a little less than half of immigrants who lack legal permission to live in the U.S. didn't enter the country illegally. They overstayed their visas, worked without authorization, dropped out of school or otherwise violated the conditions of their visas.

___

WHAT'S IN A NAME?

There are varying and strong opinions about how best to refer to the 11 million-plus people who are in the U.S. without legal permission.

Illegal immigrants?

Undocumented workers?

Unauthorized population?

Illegal aliens?

The last has generally fallen out of favor. Some immigrant advocates are pressing a "Drop the I-Word" campaign, arguing that it is dehumanizing to refer to people as "illegal."

"Undocumented worker" often isn't accurate because many aren't workers, and some have documents from other countries. Homeland Security reports refer to "unauthorized immigrants," but the agency also reports statistics on "aliens apprehended."

___

DEFINITIONS, PLEASE:

?Legal permanent residents (LPRs): people who have permission to live in the U.S. permanently but aren't citizens. They're also known as "green card" holders. Most of them can apply for citizenship within five years of getting green cards. In 2011, 1.06 million people got the cards.

?Refugees and asylees: people who come to the U.S. to avoid persecution in their home countries. What's the difference between the two terms? Refugees are people who apply for protective status before they get to the U.S. Asylees are people who apply upon arrival in the U.S. or later.

?Naturalization: The process by which immigrants become U.S. citizens.

___

GOING GREEN

Is there an actual green card? Indeed there is.

It's the Permanent Resident Card issued to people who are authorized to live and work in the U.S. on a permanent basis. In 2010, the government redesigned them to add new security features ? and make them green again.

The cards had been a variety of colors over the years. New green cards are good for 10 years for lawful permanent residents and two years for conditional residents.

___

PATH TO CITIZENSHIP

There's a lot of talk about creating a "path to citizenship" for immigrants who are in the U.S. without legal status. But there's no consensus on what the route should be, and some conservatives reject the idea outright, seeing it as tantamount to amnesty.

There is a vigorous debate over what conditions immigrants who are in the U.S. illegally should have to satisfy to get citizenship ? paying taxes or fees, passing background checks, etc.

Some Republicans want to first see improvements in border security and in tracking whether legal immigrants leave the country when required. Obama doesn't support linking the path to citizenship with border security.

Some conservatives want to grant immigrants who are in the U.S. illegally some sort of legal status that stops short of citizenship. Some 43 percent of Americans think those who are here illegally should be eligible for citizenship, one-quarter think they should only be allowed to apply for legal residency, and about the same share think they should not be allowed to stay legally at all, according to a Pew Research Center survey released in March.

___

A NEW ACRONYM

Move over LPRs; make way for LPIs.

The president's draft immigration proposal would create a "Lawful Prospective Immigrant" visa. It would allow those who are here illegally to become legal permanent residents within eight years if they met certain requirements such as a criminal background check. They could later be eligible to become U.S. citizens.

___

THE A-WORD

Nothing stirs up a hornet's nest like talk of amnesty for immigrants who are in the country illegally, although there's a lot of disagreement over how to define the term.

A 2007 effort to overhaul the immigration system, led by Bush, failed in part because Republicans were dismayed that it included a process to give otherwise law-abiding immigrants who were in the country illegally a chance to become citizens. Critics complained that would be offering amnesty.

All sides know it's not practical to talk about sending 11 million-plus people back to their countries of origin. So one big challenge this time is finding an acceptable way to resolve the status of those who are in the country illegally.

___

GETTING A REPRIEVE

While the larger immigration debate goes on, the government already is offering as many as 1.76 million immigrants who are in the country illegally a way to avoid deportation, at least for now.

Obama announced a program in June that puts off deportation for many people brought here as children. Applicants for the reprieve must have arrived before they turned 16, be younger than 31 now, be high school graduates or in school, or have served in the military. They can't have a serious criminal record or pose a threat to public safety or national security.

Applications for the Deferred Action for Childhood Arrivals program are averaging 3,300 a day. By mid-March, nearly 454,000 people had applied and more than 245,000 had been approved, with most of the rest still under consideration.

In some ways, the program closely tracks the failed DREAM Act, which would have given many young illegal immigrants a path to legal status. Obama's program doesn't give them legal status but it at least protects them from deportation for two years.

___

HISTORY: DOING THE WAVE

The U.S. is in its fourth and largest immigration wave.

First came the Colonial era, then an 1820-1870 influx of newcomers mostly from Northern and Western Europe. Most were Germans and Irish, but the gold rush and jobs on the transcontinental railroad also attracted Chinese immigrants.

In the 1870s, immigration declined due to economic problems and restrictive legislation.

The third wave, between 1881 and 1920, brought more than 23 million people to the U.S., mostly from Southern and Eastern Europe, aided by cheaper trans-Atlantic travel and lured by employers seeking workers.

Then came the Great Depression and more restrictive immigration laws, and immigration went into decline for decades.

The fourth wave, still underway, began in 1965 with the end of immigration limits based on nationality. Foreign-born people made up 1 in 20 residents of the U.S. in 1960; today, the figure is about 1 in 8.

___

HISTORY: HERE A LAW, THERE A LAW

Until the late 1800s, immigration was largely a free for all. Then came country-by-country limits. Since then, big changes in U.S. immigration law have helped produce big shifts in migration patterns.

Among the more notable laws:

?1965 Immigration and Nationality Act: Abolished country-by-country limits, established a new system that determined immigration preference based on family relationships and needed skills, and expanded the categories of family members who could enter without numerical limits.

?1986 Immigration Reform and Control Act: Legalized about 2.7 million immigrants living in the U.S. illegally, 84 percent of them from Mexico and Central America.

?1990 Immigration Act: Increased worldwide immigration limit to a "flexible cap" of 675,000 a year. The number can go higher in some years if there are unused visas available from the previous year.

?1996 Immigrant Reform and Immigrant Responsibility Act. Expanded possible reasons for deporting people or ruling them ineligible to enter the U.S., expedited removal procedures, gave state and local police power to enforce immigration laws.

?Post-2001: In 2001, talk percolated about a new immigration plan to deal with unauthorized immigrants, guest workers and violence along the Mexican border. But the Sept. 11 terrorist attacks of 2001 put an end to that, amid growing unease over illegal immigration.

___

ABOUT LAST TIME. ...

The last big immigration legalization plan, in 1986, took six years to get done.

The law, signed by President Ronald Reagan, had three main components: making it illegal to hire unauthorized workers, improving border enforcement and providing for the legalization of a big chunk of the estimated 3 million to 5 million immigrants then in the country illegally.

The results were disappointing on two central fronts: The hiring crackdown largely failed because there was no good way to verify eligibility to work, and it took a decade to improve border security. As a result, illegal immigration continued to grow, fueled by the strong U.S. economy.

What did work as intended: Close to 3 million immigrants living in the U.S. without permission received legal status. By 2009, about 40 percent of them had been naturalized, according to Homeland Security.

___

LATINOS RISING

Census figures show that between 1960 and 2010, immigration from Europe declined while the numbers coming from Latin America and Asia took off. As the immigrants' points of origin changed, so did their destinations. Concentrations shifted from the Northeast and Midwest to the South and West.

A few Census Bureau snapshots:

?In 1960, there were fewer than 1 million people in the U.S. who were born in Latin America. By 2010, there were 21.2 million.

?In 1960, 75 percent of foreigners in the U.S. came from Europe. By 2010, 80 percent came from Latin America and Asia.

?In 1960: 47 percent of the foreign-born lived in the Northeast and 10 percent in the South. By 2010, 22 percent lived in the Northeast and 32 percent in the South.

___

THE FENCE

The fence between the U.S. and Mexico runs off and on for 651 miles along the 1,954-mile border. Most of it has been built since 2005. At some points, it's an 18-foot-high steel mesh structure topped with razor wire. At others, it's a rusting, 8-foot-high thing, made of Army surplus landing mats from the Vietnam War.

The fencing is one of the more visible manifestations of a massive effort over the past two decades to improve border security. The results of that effort are dramatic. Those images of crowds of immigrants sprinting across the border illegally while agents scramble to nab a few are largely a thing of the past.

Two decades ago, fewer than 4,000 Border Patrol agents worked along the Southwest border. Today there are 18,500.

Plummeting apprehension statistics are one measure of change: 357,000 last year, compared with 1.6 million in 2000. The numbers are down in part because fewer are trying to make it across.

The border isn't sealed but it is certainly more secure.

___

WHO'S HANGING AROUND

With tighter border security and years of economic difficulty in the U.S., it turns out that most of the immigrants who are in the U.S. without permission have been there for a while. Just 14 percent have arrived since the start of 2005, according to Homeland Security estimates. In contrast, 29 percent came during the previous five years.

At the peak in 2000, about 770,000 immigrants arrived annually from Mexico, most of them entering the country illegally. By 2010, the pace had dropped to about 140,000, most of them arriving as legal immigrants, according to Pew.

___

WHO'S LEAVING?

Mexicans, mostly. Since 1986, more than 4 million noncitizens have been deported. Deportations have expanded in the Obama administration, reaching 410,000 in 2012 from 30,000 in 1990. Most of those deported ? 75 percent ? are sent back to Mexico. Nearly half of those removed had prior criminal convictions. So far, the Obama administration has deported more than 1.6 million people.

___

TO NATURALIZE OR NOT

Lots of U.S. immigrants who are eligible to become naturalized citizens don't bother. As of 2010, about two-thirds of eligible immigrants had applied for citizenship, according to the Migration Policy Institute. That lags behind the rate in other English-speaking countries such as Australia and Canada, which do more to promote naturalization.

___

WHY BOTHER?

What's so great about citizenship?

Naturalization offers all sorts of rights and benefits, including the right to vote and run for office. Naturalized citizens are protected from losing their residency rights and being deported if they get in legal trouble. They can bring family members into the U.S. more quickly.

Certain government jobs and licensed professions require citizenship. Citizenship also symbolizes full membership in U.S. society.

In 2010, there was a 67 percent earnings gap between naturalized citizens and noncitizen immigrants, according to a report from the Migration Policy Institute. Even after stripping out differences in education, language skills and work experience, naturalized citizens earned at least 5 percent more.

___

SKIPPING IT

Nearly two-thirds of the 5.4 million legal immigrants from Mexico who are eligible to become U.S. citizens haven't done so, according to a Pew study released in February. Their rate of naturalization is half that of legal immigrants from all other countries combined. The barriers to naturalization cited by Mexican nonapplicants include the need to learn English, the difficulty of the citizenship exam and the $680 application fee.

___

WORKERS

How do immigrants who are in the U.S. without permission fit into the nation's jobs picture?

In 2010, about 8 million were working in the U.S. or trying to get work. They made up about 5 percent of the labor force, according to Pew. Among U.S. farm workers, about half are believed to be in the country illegally, according to the Government Accountability Office.

Business groups want a system to legally bring in both more highly skilled workers and more lower-skilled workers such as agricultural laborers. The idea is to hire more when Americans aren't available to fill jobs. This has been a sticking point in past attempts at immigration overhaul. Labor groups want any such revamped system to provide worker protections and guard against displacing American workers. Current temporary worker programs are cumbersome and outdated.

___

EMPLOYERS

Current law requires employers to have their workers fill out a form that declares them authorized to work in the U.S. Then the employer needs to verify that the worker's identifying documents look real. But the law allows lots of different documents, and many of them are easy to counterfeit.

The government has developed a mostly voluntary employment verification system called E-Verify, which has gradually gotten better. But so far just 10 percent of employers are using it, according to the Migration Policy Institute. The system is now required in varying degrees by 19 states.

___

FAMILIES VS. JOBS

A big question in the immigration debate centers on how much priority to give to the family members of U.S. citizens and permanent residents.

Under current law, the U.S. awards a much larger proportion of green cards to family members than to foreigners with job prospects here. About two-thirds of permanent legal immigration to the U.S. is family-based, compared with about 15 percent that is employment-based, according to the Migration Policy Institute. The rest is largely humanitarian.

Some policymakers think employment-based immigration should be boosted to help the economy. Advocates for families want to make sure any such action doesn't come at the expense of people seeking to join relatives in the U.S.

___

WHO CARES?

For all the attention being devoted to immigration right now, it's not the top priority for most people, even for most Hispanics. It ranked 17th on a list of policy priorities in a recent Pew Research Center poll. Among Hispanics, one-third said immigration was an extremely important issue to them, behind such issues as the economy and jobs, education and health care.

___

WHAT TO DO?

The public is divided on what should be done to fix immigration problems. In a recent Pew survey, 28 percent said the priority should be tighter restrictions on immigration, 27 percent said creating a path to citizenship, and 42 percent thought both approaches should get equal priority.

___

A VIEW FROM THE SOUTH

Is life actually better in the U.S.? A little more than half of Mexican adults think so, according to a 2012 Pew Global Attitudes poll. Thirty-eight percent said they'd move to the U.S. if they had the chance. Nineteen percent said they'd come even without authorization.

___

Sources: Pew Hispanic Center, Migration Policy Institute, Department of Homeland Security, Census Bureau, Government Accountability Office, Population Reference Bureau, Encyclopedia of Immigration.

___

Associated Press writers Alicia Caldwell and Erica Werner contributed to this report.

___

Follow Nancy Benac on Twitter: http://www.twitter.com/nbenac

Source: http://news.yahoo.com/immigration-green-cards-citizenship-121159749.html

how to cook a turkey emma stone Frys tryptophan BestBuy.com Kohls Black Friday www.walmart.com