Tuesday, October 23, 2012

Hind wings gave four-winged dino flight control

Much-debated rear wings could have given Microraptor extra help in airborne maneuvers

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Four-winged dinosaurs didn?t have to splay out all their limbs to benefit from the rear pair, instead using the hind legs to maneuver in tight turns.

3D reconstruction by David Krentz

RALEIGH, N.C. ? A rethink of four-winged dinosaurs suggests that the much-debated hind wings stayed tucked under the body until deployed in the air for tight turns to dodge branches or chase prey.

Just what a dinosaur did with well-developed feathers on all four of its limbs has been a puzzle since the 2003 unveiling of roughly 130-million-year-old Microraptor gui fossils from northeastern China. The first reconstruction showed the small dinosaur gliding in the air with all four limbs extended outward. A later proposal lowered the hind-limb feathers for a Wright-Brothers biplane of wings. Both arrangements have drawn criticism.

In a simpler solution, the dinosaur could have kept its hind limbs under its body much of the time until needed for banking in a turn, Justin Hall of the University of Southern California said on October 20 at the annual meeting of the Society of Vertebrate Paleontology. Extending a feathery right leg a bit while veering left, or vice versa, could easily have shrunk the turning the radius by a notable amount depending on the leg angle, he and his colleagues calculated.

That boost for agility makes more sense aerodynamically than keeping both Microraptor hind limbs extended, Hall said. The probable shape of the hind legs? feather array wouldn?t have generated much lift, so the extra surface would have been worse than useless for straight-ahead moves. ?For every surface, you pay a little drag tax,? said coauthor Michael Habib, also at USC.

In contrast, deft maneuvering would have helped the forest-dwelling M. gui cope with complex obstacles. Also, Habib said, the four-winged dinosaur still had the basic body shape of its terrestrial lineage, and feathered legs and a large tail fan could have helped compensate when in the air.

M. gui may be the best known of four-winged dinosaurs, but paleontologists have since found several more. The researchers? method of calculating an agility boost should work for all four-winged species, said coauthor Luis Chiappe of the Natural History Museum of Los Angeles County. And, Habib said, agility should matter regardless of whether a four-winged dinosaur could power along in sustained flight or just glide.

Powered flight and gliding downward have developed in quite different evolutionary branches, said Kevin Padian of the University of California, Berkeley. Maneuverability is certainly important to both, but he does not see gliding as an evolutionary baby step on a path toward powered flight.

J. Brougham and S.L. Brusatte. Distorted Microraptor specimen is not ideal for understanding the origin of avian flight. Proceedings of the National Academy of Sciences USA. Vol. 107, October 5, 2010, p. E155. doi: 10.1073/pnas.1004977107
[Go to]

S. Perkins. Wings Aplenty: Dinosaur species had feathered hind limbs. Science News. Vol. 163, January 25, 2003, p. 51.
[Go to]

S. Perkins. Ancient glider: Dinosaur took to the air in biplane style. Science News. Vol. 171, January 27, 2007, p. 53.
[Go to]

J. Rehmeyer. Flying with their legs: Hind feathers made primitive bird nimble. Science News. Vol. 170, September 23, 2006, p. 197.
[Go to]

Source: http://www.sciencenews.org/view/generic/id/345970/title/Hind_wings_gave_four-winged_dino_flight_control

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Monday, October 22, 2012

IssaLeaks: More fallout from the Benghazi killings

Was it a good idea to?release a lot of un-redacted State Department memos from Libya? Probably not.

By Dan Murphy,?Staff writer / October 22, 2012

Well, if the US ever does try to extradite Julian Assange, Congressman Darrell Issa has just given some ammunition for his defense.

Skip to next paragraph Dan Murphy

Staff writer

Dan Murphy is a staff writer for the Monitor's international desk, focused on the Middle East.?Murphy, who has reported from Iraq, Afghanistan, Egypt, and more than a dozen other countries, writes and edits Backchannels. The focus? War and international relations, leaning toward things Middle East.

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There is no evidence that the US is interested in extraditing Mr. Assange, of course, and it's unclear what he could be charged with if they ever did. But when Assange's WikiLeaks started dumping US diplomatic cables all over the Internet two years ago, frequently without redacting the names of people who could be put in harm?s way by the releases, a number of American politicians figuratively called for his head.

Among them was Darrell Issa (R) of California. In Jan. 2011, as he took the reins of the House Oversight and Government Reform Committee, the congressman told Fox News that the US should immediately prosecute Assange, that ?the world is laughing at this paper tiger we've become," and that the release of private diplomatic cables severely damages the ability of US diplomats to operate.

NBC/Wall Street Journal poll has Obama, Romney tied at 47 percent (reuters)

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ID Theft - Ehline Law Firm PC

Ehine discusses identity theft

Accident lawyer talks about stolen identity

By: Accident attorney Michael P. Ehline, Esq.?After Google Places merged our business law firm listing with a competitor about 40 miles away, and refused to fix it, we started doing research on identity theft, and created this pretty comprehensive treatise.

Definition of Identity Theft: Identity theft occurs when another person assumes an individual?s personal identity. This is done in an effort to access financial resources of the individual, obtain credit and other benefits, using the person?s name. Identity theft makes a victim of the individual, who can suffer the adverse consequences of the thief using their credit, if they are held responsible for the financial costs. This type of theft is done by using the individual?s information, which can include their name, Social Security number, credit card or bank account number without permission and in order to commit crimes or fraud.

The term identity theft has been used since 1964, and while it is not possible to actually steal a person?s identity, rather they are impersonating or assuming their financial identity to commit fraud.?Identity theft and data breaches can be difficult to recognize, since in most cases the individual does not know that anyone else has their personal or financial information. According to a report done by the Federal Trade Commission, when it is clear that there has been a breach, the person often does not know how their information was obtained by another person. They also found that identity fraud was not always a consequence of identity theft, since it is possible for an individual to steal or misappropriate personal information, without committing fraud.

Major Breach

This can occur when there is a major data breach. Most data breaches, according to a U.S. Government Accountability Office study determined they did not resulted in detected occurrences of identity theft. The report did state that the full extent data breaches are unknown. An unpublished study by Carnegie Mellon University stated that most cases of identity theft is unknown, but the probability of becoming a victim of identity theft as a result of a data breach is approximately 2 percent. One of the largest data breaches consisted of approximately 4 million records and according to the association of consumer data companies; it resulted in approximately 1800 instances of identity theft.

In an article entitled ?Cyber Crime Made Easy,? this discussed the level that hackers are using malicious software. Security specialist Gunter Ollmann said ?Interested in credit card theft? There is an app for that.? What he was alluding to is the ease that hackers are accessing information online. One of the newer programs that are infecting computers is called Zeus, which is hacker friendly, making it easy to use even for a new hacker to operate. It might be easy to use, but it is devastating for the computer user it affects. The article said that programs like Zeus can be used to steal credit card information and important documents, even those necessary for homeland security use. Hackers gaining this information could not only use it for identity theft, but for possible terrorist attacks.

Types of Theft

The non-profit Identity Resource Center has divided identity theft into five categories.
Criminal Identity Theft: This is posing as another person for financial or personal gain, which is a crime.

  • Financial Identity Theft: This is the use of another person?s identity to obtain goods, services and credit.
  • Child Identity Theft: This is the use of a child?s information to obtain credit, services and goods or assume their identity.
  • Medical identity Theft: This is the use of another person?s identity in order to obtain medical care or drugs.
  • Identity Cloning Theft: This is the use of another person?s identity in order to assume their identity in life. It means using the person?s name in meeting people, employment and other activities.

Cases of identity theft can be used to fund other crimes, such as phishing, illegal immigration, terrorism and espionage. The use of identity cloning can be used in attacking payment systems, such as online credit card processing and medical insurance.

Criminal Identity Theft

This occurs when an identity thief impersonates another individual in order to conceal their real identity. People that do this could be a person hiding from creditors, other individuals, an illegal immigrant or a person that just wants to become anonymous for personal reasons. Another type of identity theft is known as a poser. The poser is a person that uses another individuals photos and information on social networking sites, they further relay creditable stories, which involve friends of a real person they are attempting to intimidate. One of the other things this type of thief does is to acquire false credentials that will pass authentication in daily life, and this can continue indefinitely, without detection.

Identity Cloning

This is an identity thief that who assumes another individuals name in order to conceal their real identity. This is their own form of witness protection program, and they may be hiding from creditors, an illegal immigrant, or just want to be anonymous for personal reasons, like to avoid being found by an ex-spouse or partner. This can continue for an indefinite amount of time, especially if the person is able to obtain false credentials in the assumed name that appear authentic. Another type of identity cloning is the person that is a ?poser,? this is a person that assumes the identity of an individual on social networking websites, using photos, information and even creating stories that are believable including friends of the individual in an attempt to intimidate the person.

Synthetic Identity Theft

This is a type of identity theft that has become common, with the use of identities that are either partially or completely fictitious. Commonly the way this is done is by using a real social security number, with a birth date and name that is not attached to this number. The person, whose social security number is used, can have negative credit affects from this kind of identity theft, as well as any creditor who issues credit to the thief. It is difficult to track this type of identity fraud, since it does not usually show on the real person?s credit report directly. This could even show as a new file at the credit bureau or as a sub-file on the victim?s credit record. Creditors that have permitted or issued credit to the identity thief, can suffer also, since it is almost impossible to determine who they are.

Medical Identity Theft

This is a type of identity theft that a person uses an individual?s name and some of their information in order to obtain medical care, services or drugs. The information they may use can include insurance information and the individual has no clue their name or information is being used. When this type of event occurs it can cause the real owner of the insurance to receive improper medical care or potentially life-threatening medical decisions, since there has been incorrect information placed in their medical records.

Child Identity Theft

This is identity theft of a minor child?s social security number that is used to gain credit and other personal advantages. The child has no credit history, which makes this social security number valuable to the person that wants to steal it. They can obtain credit, get a driver?s license, and make large purchases, like buying a house, all under the guise that the social security number is their own. This is a crime that is usually done by a family member or friend, in some cases it can be done by a stranger that targets children. The fraud can continue for years, without being detected, since the victim is a minor who will not be using their number for years. According to Carnegie Mellon Cylab, Richard Power, using data from AllClear ID, it was discovered that approximately 10.2 percent of children were identity theft victims. This is about 40,000 children, whose information has been used by another person.

How Thieves Get Personal Information

These thieves need to obtain personal information in order to use another person?s identity, to appear authentic. Some of the methods they use, most people are aware of and other methods are less commonly known.

  • Digging in dumpsters or garbage cans for personal information.
  • Using public records to gain personal information.
  • Skimming credit card or bank card information with the use of hand held card readers in public retail location and making clone cards.
  • Using contactless credit card readers to wirelessly obtain data from RFID-passports.
  • Mail theft, breaking into homes or pick-pocketing checks, bank cards, credit cards, passports and identification cards.
  • Theft of checks to obtain account numbers and routing numbers.
  • Gaining personal and banking information with the use of malware, like Trojan horse keystroke logging programs, spyware and breaches in browser security.
  • Hacking computer networks, databases and systems to gain access to large amounts of personal data.
  • Acting fraudulently as customer service representatives or help desk employees to con individuals into disclosing personal information, login information or changing the password access.
  • Account verification and compromise questions, these are commonly used and one of the most used is ?What is Your Mother?s Maiden Name.?
  • Use of social media sites to befriend individuals and gain trust to get their personal information.
  • Social media photos that are clickable and downloaded, which have low security and privacy protection.
  • Using information gained from an individual typing login and other personal information at public IT equipment locations. This is known as shoulder surfing.
  • Use of breaches that result in the publication of personal information, which may include name, address, credit card numbers and social security number.
  • Impersonation of a trusted organization in emails, telephone calls, SMS text messages or other forms of communication to have an individual provide personal information or login information. This is often done as a form of data collection known as phishing or on a fake corporate website. Many corporations explain they will never ask for this type of information on the phone or their website.
  • Browsing social network sites, such as Facebook, Twitter or MySpace for personal information that users have published.
  • Attacking weak passwords and reset password questions.
  • Diverting email or a post to gain personal information, credit card numbers, banking or credit statements and other personal information. This can delay the individual from finding out their account has been compromised.

Personal Identity Protection

The individual is often unaware of how na?ve they are, with their personal information or login information. Identity thieves count on this, and they can steal information like credit cards, checkbooks, utility bills, bank statements and other things from a person?s vehicle, office, snatched purse or home. The US Federal Trade Commission, websites and the Canadian Phone Busters organizations address identity theft and offer recommendations on how to prevent personal information from reaching another person?s hands.

Identity theft can be partially eliminated by an individual by not using identifying information unnecessarily. They imply that IT systems and organizations should not require an excessive amount of personal information for identification and authentication purposes. The requirement and data storage of personal identifying information such as social security numbers, driver?s license number, credit card, national identification number and other information, will increase the risk of identity theft, unless it is adequately stored all the time.

Hacking and phishing electronic identity theft or using malware, the individual is advised to have and keep updated computer security. Keeping the operating system and browser secure, patched and running antivirus software can help avoid unwanted theft. The individual should be cautious of their IT use.

In some cases the thieves use obituaries, gravestones and other sources to use the identity of a deceased person, between their passing and the closing of their accounts. This is a combination of a grieving family being lacking concentration and the credit checking process. This crime can continue for an undetermined amount of time, until a family member or credit company notices the events and take action.

Commercial identity theft protection services are available in many countries and claim to help protect individuals from having their identity stolen. This is done for an annual or monthly membership fee. The service will normally either set fraud alerts on the individual?s credit files with each of the three major credit bureaus or using credit report monitoring. These services are heavily advertised, but the actual value of them has been questioned.

Identity Protection Organizations

The Federal Trade Commission testified in May of 1998 in front of the United States Senate, discussing the sale and use of personal identifiers and Social Security numbers, by data miners and credit raters. They agreed to self-regulating by the industry to restrict access of information on credit reports. The industry restrictions vary according to the category of the customer, since credit bureaus gather, disclose personal and credit information on a wide business range.

Inadequate security by organizations of personal data, results in unauthorized access and puts the individuals at risk of theft. According to Privacy Rights Clearinghouse, they have documented more than 900 data breaches, since January 2005 by U.S. government agencies and companies. This has involved over 200 million records that contained sensitive personal information, including many that had social security numbers. When a company has poor standards of data security it can include:
Failing to have adequate network security.
Failing to shred confidential documents before putting them in dumpsters.
Brokering personal information to another business, without the assurance of the other company maintaining security.
Government failure in registering sole proprietorships, corporations and partnerships to determine the article of incorporations officers are who they claim to be. This failure can result in criminals having access to personal information through credit ratings and data mining services.
Credit card numbers that are stolen by call center agents or individuals that have access to the recorded calls.
Laptop computer or portable media theft or carried out of the location that contain personal information. Use of encryption on these devices can reduce the chance of personal data being obtained or used.

Nationwide Impact

There was a decrease in the number of victims in the United States between 2003 and 2006, which decreased the dollar amount of identity fraud from $47 billion in 2003 to $15.6 billion in 2006. This resulted in an individual personal loss of $4789 in 2003 to $1882 in 2006. According to the Identity Theft Resource Center in a 2003 survey:
Approximately 73 percent of the surveyed individuals said the crime involved the thief gaining access to a credit card.

Approximately 15 percent of the individuals found out about the theft, due to action taken by a business.?It took the victims approximately 330 hours to resolve the issues.
Victim of identity fraud Michelle Brown, testified in a U.S. Senate Committee Hearing and said that between January 1998 and July 1999 a person used her identity to acquire more than $50,000 in goods and services. Brown said not only did the individual damage her credit, but escalated in crimes, including drug trafficking. This resulted in an a warrant for Brown?s arrest, she had an erroneous arrest record and prison record, when the woman was booked in the Chicago Federal Prison under her name.

In the United Kingdom identity fraud costs are estimated at ?1.2 billion annually, with experts believing the figure is much higher. Privacy groups do not believe the numbers to be correct an argue the figures are being used as a bargaining chip in the introduction of national ID cards.

Microsoft Research in 2011 claimed the estimates of identity fraud were largely exaggerated and surveys are compromised and biased. They said that no faith can be placed in the findings.?Australia says identity theft was estimated at between $1 billion and $4 billion in 2001.

United States Legal Answers

In the United States the increase in this crime, has led to the enacting of the Identity Theft and Assumption Deterrence Act. The Federal Trade Commission appeared before the U.S. Senate to discuss FTC crimes, in which consumer credit was exploited to gain lines of credit, loan fraud, mortgage and credit card fraud, along with commodities and services fraud.

The Identity Theft Deterrence Act amended U.S. Code Title 18, ? 1028. This statute changed from fraud related to activity in connection with identification documents, information and authentication to include any means of identification an individual knowingly possess, with or without lawful authority. It is a federal crime, but the crime must include an identification document that is issued by the United States or intended to be used to defraud the United States in order to be tried on a federal level. This is outlined in 18 U.S.C.???1028 and can carry a 5, 15, 20 or 30 year prison sentence in federal prison. The laws were also strengthened for unlawful means of identification in ??1028 (aggravated identity theft), which permits consecutive sentencing.

This act provided the Federal Trade Commission with the authority to track incidences and dollar losses. Their authority mainly focuses on consumer financial crimes and does not include the range of all identification crimes. Charges brought by states or local law enforcement agencies will have different penalties, than charges on a federal level. It will depend on the state laws, which each state can differ in their penalties.

California and Wisconsin have created the Office of Privacy Protection, which helps citizens to avoid issues with theft and those who are recovering from identity theft. Other states have followed the California mandatory data breach notification laws. This has resulted in all companies reporting data breaches to their customers. The IRS created the IRS Identity Protection Specialized Unit to assist taxpayers who have become victims of federal tax related identity theft. The taxpayer will be required to submit Form 14039, which is their Identity Theft Affidavit.

Source: http://articles.ehlinelaw.com/id-theft/

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Sunday, October 21, 2012

Andrea Heidemarie: moinakelly: Reference and Education

The United States of America is a nation full of natural riches, from rain forests, rivers, lakes, oceans, desserts, and whatnot. If sustained, supported, and consolidated properly, these natural resources can turn into economical and industrial behemoths that can serve the people environmentally and financially.

For this reason, the United States Government has developed a slew of agencies that are established solely to render concerns related to the country's natural resources.

The United States Forest Service, one of the agencies in the natural resources sector, is an agency operating under the United States Department of Agriculture that administers the nation's 155 national forests and 20 national grasslands, which encompass 193 million acres of land.

The mission of the agency is "to sustain the health, diversity, and productivity of the Nation's forests and grasslands to meet the needs of present and future generations."

The agency is divided into three primary divisions, the National Forest System, State and Private Forestry, and the Research and Development branch. The agency carries out its mission by establishing grant programs such as the Collaborative Forest Restoration Program, which was generally intended to encourage individuals, businesses, groups and other organizations to collaborate on the design, implementation, and monitoring of projects that value local and traditional knowledge, promote healthy and productive forests and watersheds, and build ownership and civic pride.

The National Park Service, on the other hand, is a United States federal agency that manages manages all national parks, various national monuments, and other conservation and historical properties with various title designations.

The grants and programs of the National Park service are all geared towards the achievement of its primary agency mission which is to "provide quality law enforcement to safeguard lives, protect our national treasures and symbols of democracy, and preserve the natural and cultural resources entrusted to us."

Meanwhile, the United States Fish and Wildlife Service, operating within the United States Department of the Interior, is the primary agency dedicated to the management of fish, wildlife, and natural habitats.

The mission of the agency, which is "to conserve, protect, and enhance fish, wildlife, plants and their habitats for the continuing benefit of the American people", is carried out by creating several grants and initiatives that serve this purpose.

One of these grant programs is the Evaluation of Mixed-grass Prairie Biotic Communities Project, which was developed to assist with research study design, statistical analyses, data assimilation, and development of written scientific manuscript or report regarding the present situation of mixed-grass prairie biotic communities.

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Beirut braces for funeral of anti-Syrian official

BEIRUT (AP) ? Lebanese forces set up road blocks and cordoned off Beirut's central square Sunday, boosting security in the capital ahead of a public funeral for an assassinated intelligence official who was a powerful opponent of Syria.

The bombing on Friday killed Brig. Gen. Wissam al-Hassan and seven others in an attack that many blame on Syria. Al-Hassan, 47, headed an investigation over the summer that led to the arrest of former Information Minister Michel Samaha, a Lebanese politician who was one of Syria's most loyal allies in Lebanon.

Even before the bombing, the civil war in neighboring Syria had set off violence in Lebanon and deepened tensions between supporters and opponents of President Bashar Assad's regime. The attack heightened fears that Lebanon could easily plunge back into cycles of sectarian violence and reprisal that have haunted it for decades.

Dozens of anti-Syrian protesters erected eight tents near the Cabinet headquarters in central Beirut, saying they will stay until Prime Minister Najib Mikati's government, which is dominated by the Shiite militant group Hezbollah and its allies, resigns. Hezbollah is Syria's most powerful ally in Lebanon, which for much of the past 30 years has lived under Syrian military and political domination.

"The Syrian regime started a war against us and we will fight this battle until the end," said protester Anthony Labaki, a 24-year-old physiotherapist who is a member of the right-wing Phalange Party. He said the protesters will not leave the area until Mikati's government resigns and those behind al-Hassan's killing are uncovered.

Syria's hold on Lebanon began to slip in 2005, when former Prime Minister Rafik Hariri, an opponent of Syria, was assassinated in truck bomb along Beirut's Mediterranean waterfront. Syria denied any role. But broad public outrage in Lebanon expressed in massive street protests forced Damascus to withdraw its tens of thousands of troops from the country.

For years after the pullouts, there was a string of attacks on anti-Syrian figures in Lebanon without any trials for those responsible. Assad has managed to maintain his influence in Lebanon through Hezbollah and other allies.

Samaha, the former minister arrested in al-Hassan's investigation, remains in custody. He is accused of plotting a wave of attacks in Lebanon at Syria's behest.

Syrian Brig. Gen. Ali Mamlouk, one of Assad's most senior aides, was indicted in absentia in the August sweep that saw Samaha arrested. Samaha's arrest was an embarrassing blow to Syria, which has long acted with impunity in Lebanon.

The car bombing struck Beirut's mainly Christian Achrafieh neighborhood and also wounded dozens of people, including children.

Al-Hassan will be buried in Beirut's Martyrs Square next to the late Hariri. Security was tight as thousands of people headed to the capital from around the country to attend the funeral.

Al-Hassan's body will first be taken to police headquarters for an official procession to the square.

Policemen and soldiers cordoned off the square, searching people trying to enter and barring vehicles. Giant posters of al-Hassan were set up around Beirut ahead of the funeral, calling him a "martyr of sovereignty and independence."

On Saturday, Mikati linked the bombing to the Samaha case.

"I don't want to prejudge the investigation, but in fact we cannot separate yesterday's crime from the revelation of the explosions that could have happened," he said.

Mikati, who opponents say is too close to Syria and Hezbollah, offered to resign after the bombing. But President Michel Suleiman asked him to stay so as not to add to the instability.

Many of Lebanon's Sunni Muslims have backed Syria's mainly Sunni rebels, while Shiite Muslims have tended to back Assad. Assad, like many who dominate his regime is a member of the Alawite sect, an offshoot of Shiite Islam.

Al-Hassan was a Sunni who challenged Syria and Hezbollah.

Source: http://news.yahoo.com/beirut-braces-funeral-anti-syrian-official-092607486.html

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Dolphins able to sleep with half their brains, stay awake for two weeks straight

New findings suggest how dolphins can keep on the constant lookout for sharks, investigators added.

By Charles Choi,?LiveScience Contributor / October 18, 2012

Even after 15 days of remaining alert without snoozing, the two dolphins in the study (a female named Say, shown here, and a male, Nay) used echolocation with near-perfect accuracy.

Brian Branstetter

Enlarge

Dolphins can stay constantly alert for more than two weeks by sleeping with only half of their brains, researchers say.

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These findings suggest how dolphins can keep on the constant?lookout for sharks, investigators added.

Unlike land mammals,?dolphins sleep?with only part of their brains at any time, past research has suggested. Half of their brains rest, while the other half remains "awake," and dolphins regularly switch which side is active.

"After being awake for many hours or days, humans and other animals are forced to stop all activity and sleep," said researcher Brian Branstetter, a marine biologist at the National Marine Mammal Foundation in San Diego. "Dolphins do not have this restriction, and if they did, they would probably drown or become easy prey."

To see just how mindful dolphins are with just half a brain, researchers tested their ability to scan the environment.Dolphins use echolocation?to map the world, a biological form of sonar where they emit clicks and listen for their echoes to probe murky, dark surroundings. [Sleep Tight! Snoozing Animals Gallery]

The researchers set up a portable floating pen outfitted with eight modules, each consisting of an underwater sound projector and microphone. When a dolphin scanned any of these modules using echolocation clicks, they could respond with sounds mimicking echoes of those clicks from remote surfaces. Essentially, these modules could behave as "phantom targets" ? illusions that acoustically simulated physical objects.

The scientists had two dolphins ? a female, Say, and a male, Nay ? continuously scan these modules. If they detected phantom targets, they were trained over the course of a year to press a paddle to get fish. The dolphin Say often gave victory squeals whenever she succeeded.

The scientists found these dolphins could successfully use echolocation with near-perfect accuracy and no sign of deteriorating performance for up to 15 days. The researchers did not test how much longer the dolphins could have continued.

"Dolphins can continue to swim and think for days without rest or sleep, possibly indefinitely," Branstetter told LiveScience.

These findings suggest that dolphins evolved to sleep with only half their brains not only to keep from drowning, but also to remain vigilant.

"These majestic beasts are true unwavering sentinels of the sea," Branstetter said.

Future research can help verify whether the dolphins stayed awake and alert for multiple days by?sleeping with half their brains. This would require monitoring their brains for electrical activity via electroencephalogram, or a EEG.

"Research with freely moving humans who wear portable EEG equipment has been conducted; training a dolphin to wear a similar portable EEG backpack that is capable of withstanding and functioning in an ocean environment presents much greater challenges," Branstetter said. "However, these hurdles are not insurmountable. Also, we are interested in investigating if dolphins can perform more complex cognitive tasks without rest, like problem-solving or understanding an artificial language."

The scientists detailed their findings online Oct. 17 in the journal PLoS ONE.

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Source: http://rss.csmonitor.com/~r/feeds/science/~3/hWCyMDZc7DI/Dolphins-able-to-sleep-with-half-their-brains-stay-awake-for-two-weeks-straight

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