Thursday, May 2, 2013

The biology behind binge eating

May 1, 2013 ? Female rats are much more likely to binge eat than male rats, according to new research that provides some of the strongest evidence yet that biology plays a role in eating disorders.

The study, by Michigan State University scientists, is the first to establish sex differences in rates of binge eating in animals and has implications for humans. Binge eating is one of the core symptoms of most eating disorders, including bulimia nervosa and the binge/purge subtype of anorexia nervosa, and females are four to 10 times more likely than males to have an eating disorder.

"Most theories of why eating disorders are so much more prevalent in females than males focus on the increased cultural and psychological pressure that girls and women face," said Kelly Klump, lead author and professor of psychology. "But this study suggests that biological factors likely contribute as well, since female rats do not experience the psychosocial pressures that humans do, such as pressures to be thin."

Klump and colleagues ran a feeding experiment with 30 female and 30 male rats over a two-week period, replacing the rodents' food pellets periodically with vanilla frosting. They found that the rate of binge eating "proneness" (i.e., the tendency to consume the highest amount of frosting across all feeding tests) was up to six times higher in female as compared to male rats.

The tendency to binge eat may be related to the brain's natural reward system, or the extent to which someone likes and seeks reward, Klump said. The MSU researchers currently are testing the rats to see if female brains are more sensitive and/or responsive to rewarding stimuli (e.g., high-fat, high-sugar food) and the chemicals that trigger reward behavior.

The answers could ultimately help improve therapy -- both counseling and medications -- for those with eating disorders.

"This research suggests there is probably a biological difference between males and females that we need to explore to understand risk factors and mechanisms," Klump said.

The study is published online in the International Journal of Eating Disorders. Klump's co-authors are Cheryl Sisk, psychology professor, and graduate students Sarah Racine and Britny Hildebrandt.

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The above story is reprinted from materials provided by Michigan State University.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.


Journal Reference:

  1. Kelly L. Klump, Sarah Racine, Britny Hildebrandt, Cheryl L. Sisk. Sex differences in binge eating patterns in male and female adult rats. International Journal of Eating Disorders, 2013; DOI: 10.1002/eat.22139

Note: If no author is given, the source is cited instead.

Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/health_medicine/nutrition/~3/ccUxlKfnpzc/130501101304.htm

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Research helps to show how turbulence can occur without inertia

Wednesday, May 1, 2013

Anyone who has flown in an airplane knows about turbulence, or when the flow of a fluid ? in this case, the flow of air over the wings ? becomes chaotic and unstable. For more than a century, the field of fluid mechanics has posited that turbulence scales with inertia, and so massive things, like planes, have an easier time causing it.

Now, research led by engineers at the University of Pennsylvania has shown that this transition to turbulence can occur without inertia at all.

The study was conducted by associate professor Paulo E. Arratia and graduate student Lichao Pan, both of the Department of Mechanical Engineering and Applied Mechanics of Penn's School of Engineering and Applied Science. They collaborated with professor Christian Wagner of Germany's Saarland University and with professor Alexander Morozov of Scotland's University of Edinburgh.

It was published in the journal Physical Review Letters.

One of the most fundamental concepts in fluid dynamics is the Reynolds number. Named for Osborne Reynolds, the late 19th century physicist who demonstrated how fluid flowing through a pipe transitioned into a turbulent state. Reynolds numbers describe the ratio between viscous forces and inertial forces for given fluids and the conditions they are flowing in. Low Reynolds numbers are associated with "laminar" flow, which is smooth and orderly, while high Reynolds numbers are associated with turbulent flow, which is nonlinear and chaotic.

In laminar, or linear, flow, there is a direct relationship between the force applied to the fluid and how fast it moves. When the applied force is removed, viscous forces stop the fluid's motion. With turbulent, or nonlinear, flows, this relationship is no longer straight forward. This is because inertial forces keep the fluid moving even after the applied force is removed. Briefly stirring a cup of coffee with a spoon will keep the coffee swirling for minutes, but the same effect can't be achieved with a cup of honey.

"What Reynolds elegantly suggested was that the force that makes things go nonlinear or irregular is inertia, since inertia is a nonlinear force itself," Arratia said. "As water flows faster, it has more inertia and thus becomes more turbulent, which is something you can see as you turn the tap on the faucet in your sink."

The transition from smooth to turbulent has obvious implications for massive things, such as airplanes, but surprisingly, it also has an impact on small scales where mass should theoretically not play a factor. It is relevant to the flow of blood in capillaries, or in extracting oil or natural gas from porous rock, as is the case with fracking.

"In fracking, all of these liquids go through tiny pores. Originally, people thought that, since the pores were so small, there would be no inertia and therefore no turbulence, but it's there," Arratia said. "They get all of these fluctuations and unusual pressure drops, and a lot of things would fail because of it."

To explain how turbulence could arise even in the absence of inertia, Arratia's team set out to conduct an experiment similar to Reynolds' famous one, but instead of changing the inertia of the fluid, they changed the fluid itself. In their study, they pumped a polymer-infused fluid through a pipe at a constant rate. Polymers are a common feature of non-Newtonian fluids ? such as blood, ketchup or yogurt ? which have flow properties that change under certain conditions. One of the main features of non-Newtonian fluids is that their material properties, such as viscosity, are nonlinear ? there is not a direct relationship between the amount of force exerted on them and the speed at which they flow.

Another factor in the transition to turbulence is how the linear, smooth flow is initially disturbed so that a chaotic, non-linear flow begins. In Reynolds' experiment, the roughness of the walls of the pipe was sufficient to "kick" the flow into a turbulent state once a sufficient amount of inertia was present. In Arratia's experiment, this roughness was a precisely controlled via a series of cylindrical posts at the beginning of the pipe.

"After 'kicking' the pipe with these posts, we watch the fluid flow a certain distance. If that disturbance decays, the flow is laminar, but if the disturbance is maintained or grows, it's turbulent," Arratia said. "And we saw it grow."

Beyond medical or industrial applications, understanding the interplay between non-Newtonian fluids and turbulence is an important contribution to the fundamentals of fluid mechanics.

"We always thought that inertia had to be there for this transition to take place, but there are other non-linear forces out there," Arratia said. "In this case, even though we're at a low Reynolds number as there's no inertia coming from the mass, because the fluid is non-linear itself you get a very similar transition to the one Osborne Reynolds saw in 1883."

###

University of Pennsylvania: http://www.upenn.edu/pennnews

Thanks to University of Pennsylvania for this article.

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Source: http://www.labspaces.net/128058/Research_helps_to_show_how_turbulence_can_occur_without_inertia

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Russia had elder Boston suspect under surveillance

In this undated photo provided by the Dagestani branch of the Federal Security Service William Plotnikov, right, poses for a photo. Security officials suspected ties between elder Boston bombing suspect Tamerlan Tsarnaev and the Canadian, an ethnic Russian named William Plotnikov, who had joined the Islamic insurgency in the region. Russian agents placed the elder Boston bombing suspect under surveillance during a six-month visit to southern Russia last year, then scrambled to find him when he suddenly disappeared after police killed a Canadian jihadist, a security official told The Associated Press. (AP Photo/Dagestani branch of the Federal Security Service via NewsTeam)

In this undated photo provided by the Dagestani branch of the Federal Security Service William Plotnikov, right, poses for a photo. Security officials suspected ties between elder Boston bombing suspect Tamerlan Tsarnaev and the Canadian, an ethnic Russian named William Plotnikov, who had joined the Islamic insurgency in the region. Russian agents placed the elder Boston bombing suspect under surveillance during a six-month visit to southern Russia last year, then scrambled to find him when he suddenly disappeared after police killed a Canadian jihadist, a security official told The Associated Press. (AP Photo/Dagestani branch of the Federal Security Service via NewsTeam)

EDS NOTE: GRAPHIC CONTENT In this undated photo provided by the Dagestani branch of the Federal Security Service, the body of William Plotnikov, killed in a standoff with police in Dagestan. Security officials suspected ties between elder Boston bombing suspect Tamerlan Tsarnaev and the Canadian, an ethnic Russian named William Plotnikov, who had joined the Islamic insurgency in the region. Russian agents placed Tsarnaev under surveillance during a six-month visit to southern Russia last year, then scrambled to find him when he suddenly disappeared after police killed a Canadian jihadist, a security official told The Associated Press. (AP Photo/Dagestani branch of the Federal Security Service via NewsTeam)

MAKHACHKALA, Russia (AP) ? Russian agents placed the elder Boston bombing suspect under surveillance during a six-month visit to southern Russia last year, then scrambled to find him when he suddenly disappeared after police killed a Canadian jihadist, a security official told The Associated Press.

U.S. law enforcement officials have been trying to determine whether Tamerlan Tsarnaev was indoctrinated or trained by militants during his visit to Dagestan, a Caspian Sea province that has become the center of a simmering Islamic insurgency.

The security official with the Anti-Extremism Center, a federal agency under Russia's Interior Ministry, confirmed the Russians shared their concerns. He told the AP that Russian agents were watching Tsarnaev, and that they searched for him when he disappeared two days after the July 2012 death of the Canadian man, who had joined the Islamic insurgency in the region. The official spoke only on condition of anonymity because he was not authorized to speak to the news media.

Security officials suspected ties between Tsarnaev and the Canadian ? an ethnic Russian named William Plotnikov ? according to the Novaya Gazeta newspaper, which is known for its independence and investigative reporting and cited an unnamed official with the Anti-Extremism Center, which tracks militants. The newspaper said the men had social networking ties that brought Tsarnaev to the attention of Russian security services for the first time in late 2010.

It certainly wouldn't be surprising if the men had met. Both were amateur boxers of roughly the same age whose families had moved from Russia to North America when they were teenagers. In recent years, both had turned to Islam and expressed radical beliefs. And both had traveled to Dagestan, a republic of some 3 million people.

The AP could not independently confirm whether the two men had communicated on social networks or crossed paths either in Dagestan or in Toronto, where Plotnikov had lived with his parents and where Tsarnaev had an aunt.

After Plotnikov was killed, Tsarnaev left suddenly for the U.S., not waiting to pick up his new Russian passport ? ostensibly one of his main reasons for coming to Russia. The official said his sudden departure was considered suspicious.

Plotnikov's father told the Canadian network CBCNews on Monday that his son had broken off contact when he returned to Russia in 2010 and he had no way of knowing whether his son knew Tsarnaev.

In an August interview with the Canadian newspaper National Post, Vitaly Plotnikov said his son, who was 23 when he died, had converted to Islam in 2009 and quickly became radicalized. But he said he fully understood what his son was up to in Russia only when he received photographs and videos after his death.

In one photo, a smiling William Plotnikov is shown posing in the woods, an automatic rifle slung over his shoulder and a camouflage ammunition belt around his waist. In the videos, which the National Post reporter watched with the father, the younger Plotnikov talked openly of planning to kill in the name of Allah.

Plotnikov had been detained in Dagestan in December 2010 on suspicion of having ties to the militants and during his interrogation was forced to hand over a list of social networking friends from the United States and Canada who like him had once lived in Russia, Novaya Gazeta reported.

The newspaper said Tsarnaev's name was on that list, bringing him for the first time to the attention of Russia's secret services.

Novaya Gazeta, which is part-owned by former Soviet President Mikhail Gorbachev and wealthy businessman Alexander Lebedev, has regularly criticized the Kremlin. One of its best known reporters, Anna Politkovskaya, angered the Kremlin with her reporting from Chechnya, and her 2006 murder in a Moscow elevator was widely presumed to have been in connection with her journalistic work.

The Islamic insurgency in Dagestan grew out of the fierce fighting between Russian troops and separatists in neighboring Chechnya that raged in the 1990s. Attacks now are carried out almost daily in Dagestan against police and security forces, who respond with special operations of their own to wipe out the militants.

As recently as Sunday, two suspected militants were killed in a shootout after being cornered in a house in the Dagestani village of Chontaul, according to police spokeswoman Fatina Ubaidatova.

Plotnikov was among seven suspected militants killed on July 14 during a standoff with police in the Dagestani village of Utamysh, according to the official police record.

After Plotnikov's death, Russian security agents lost track of Tsarnaev and went to see his father in Makhachkala, the capital of Dagestan, who told them that his son had returned to the U.S., Novaya Gazeta said.

The agents did not believe the father, since Tsarnaev had left without picking up his new Russian passport, and they continued to search for him, the newspaper reported.

The Russians later determined that Tsarnaev had flown to Moscow on July 16 and to the United States the following day, the newspaper said. Tsarnaev arrived in New York on July 17.

Russian migration officials have said they were puzzled that Tsarnaev applied for the passport but left before it was ready.

His father, Anzhor Tsarnaev, said last week that his elder son stayed with him while waiting for the passport to be processed. He could not be reached Tuesday for comment on the Novaya Gazeta report.

The Tsarnaev family had lived briefly in Dagestan before moving to the United States a decade ago. Both parents returned to Dagestan last year.

The official with Russia's Anti-Extremism Center said Tsarnaev was filmed attending a mosque in Makhachkala whose worshippers adhere to a more radical strain of Islam. The official would give no further details about what the Russian security services knew about Tsarnaev's activities in Dagestan or about any possible connection to Plotnikov.

The AP was unable to determine whether the official was the same one who provided the information to Novaya Gazeta.

Plotnikov had settled in Utamysh, a small village about 70 kilometers (40 miles) from Makhachkala. It was not known whether he had spent any significant amount of time in Dagestan's capital.

Novaya Gazeta said Tsarnaev was also seen in the company of Mahmud Nidal ? a man who was both Palestinian and Kumyk, one of the dozens of ethnic groups living in Dagestan ? and who was believed to have ties to Islamic militants in the southern Russian region.

Nidal was killed in May 2012 after refusing to give himself up to security forces that had surrounded a house in Makhachkala, according to official police records.

Shortly after Plotnikov identified Tsarnaev during his December 2010 interrogation, the Russian secret services, the FSB, studied Tsarnaev's pages on social networking sites and asked the FBI for more information, the Russian newspaper said.

The FBI has acknowledged receiving the request. The U.S. agency said it opened an investigation, but when no evidence of terrorism was found and no further information from the Russians was forthcoming, the case was closed in June 2011.

___

Berry reported from Moscow.

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/cae69a7523db45408eeb2b3a98c0c9c5/Article_2013-04-30-Russia-Boston%20Suspect/id-d4755565fc4147eeae6b70b904c54a20

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Wednesday, May 1, 2013

Turkey investigates use of chemical weapons in Syria

By Ece Toksabay

REYHANLI, Turkey (Reuters) - Turkey is testing blood samples taken from Syrian casualties brought over the border from fighting in recent days to determine whether they were victims of a chemical weapons attack, local government and health officials said on Wednesday.

The samples were sent to Turkey's forensic medicine institute after several Syrians with breathing difficulties were brought to a Turkish hospital on Monday in the town of Reyhanli in Hatay province along the Syrian border.

"We are taking the necessary precautions as we have received unconfirmed information on the use of chemical weapons," Reyhanli Mayor Huseyin Sanverdi told Reuters.

"So far I have not received confirmation from medical institutions but there is a possibility that the weapons were used and we have to act with caution in case," he said.

Sanverdi said the hospital in Reyhanli had taken emergency measures on Monday following the claims but that those had now been lifted. He added that Monday's patients had been brought from Idlib province in northern Syria.

U.S. President Barack Obama on Tuesday said there was evidence that chemical weapons had been used during Syria's two year conflict, but that it was not yet known how the chemical weapons were used, when they were used and who used them.

Washington has long said it views the use of chemical weapons in Syria as a "red line", but wary of the false intelligence that was used to justify the 2003 war in Iraq, it has said it wants proof before taking action.

Britain last week confirmed it had "limited but persuasive" information showing chemical weapons use in Syria, including sarin, evidence that the Foreign Office now says is "physiological" - from the bodies of chemical attack victims.

A Foreign Office spokesman said it was likely that Syria, and not the rebels, would be behind any such attack, and Britain added that it was working with the United Nations to harden up evidence of whether chemical weapons had been used.

Fighting in Syria, now entering its third year, has intensified in the last month with government forces attempting to roll back rebel advances. Some 70,000 people have now been killed in the civil war.

Each side has blamed the other for what they both said was a chemical attack in the city of Saraqeb in Idlib on Monday.

EMERGENCY PLANS

A senior Reyhanli health official, who spoke on condition of anonymity, confirmed Sanverdi's statement, saying the hospital carried out "emergency plans from time to time".

One hospital employee, who also declined to be named, described how the hospital had been sealed off into the night on Monday, with specialized emergency medical teams moving in to take over after 13 patients from Idlib were brought in.

"We were given special apparel but it was the emergency team which took care of those patients. Doctors suspected sarin or mustard gas because the patients had breathing difficulties," the employee said.

Another hospital employee said staff were ordered to stay back while the team intervened.

"This cannot be without reason," the second employee said.

Wassim Taha, a Syrian doctor from the Union of Syrian Medical Relief Organisations which runs hospitals for the Syrian opposition, said the patients were washed at the border because doctors feared they had come into contact with a form of gas.

A second Syrian doctor, Ubada Alabrash, who helps treat Syrian patients at Reyhanli hospital, said they also suspected the patients had been victims of a chemical attack because those escorting them to the border had exhibited similar symptoms.

Alabrash said blood samples from the patients had been sent for tests but that they had not been given the results.

"I don't think the Turkish government would hide the results from us, but I understand they must be careful with it because NATO and other international bodies are also involved in this issue," he said.

"Now we are waiting for the blood test results from Ankara, we have asked to be informed. We can only say after the test results if chemical weapons were used or not."

(Additional reporting by Mohammed Abbas in London; writing by Jonathon Burch; editing by Mike Collett-White)

Source: http://news.yahoo.com/turkey-investigates-chemical-weapons-syria-181652530.html

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How eBay CEO John Donahoe Keeps Founders From Leaving After Acquisitions

TechCrunch Disrupt NY 2013 - Day 2At TechCrunch Disrupt 2013 NY, eBay’s CEO John Donahoe talked to Bloomberg’s chief content editor Norm Pearlstine about how the company screens its acquisitions and how he keeps founders from leaving after the acquisition. Since becoming eBay’s CEO, Donahoe said, the company has made about 20 acquisitions. Currently, fifteen of the founders that joined eBay and PayPal after their companies were acquired are still at eBay and most of them are in executive positions. After the company acquired Zong in 2011, for example, Zong’s founder David Marcus became PayPal’s vice president for mobile. After essentially getting tested in that position, he became the President of PayPal last year. Similarly, when eBay acquired Hunch (also in 2011), its team of co-founders, including Chris Dixon, Tom Pinckney and Matt Gattis joined the company (with Dixon leaving after about a year). Today, this team is in charge of eBay’s homepage. Donahoe believes that in order to keep founders from leaving, eBay needs to give them the opportunity to grow inside the company. Because of this, he is also most interested in acquiring companies where the management team believes that they can execute their vision inside eBay. “We are always looking for companies that have a strong vision,” Donahoe said. “And then we allow them to innovate at a higher level.” The kind of founders he likes, he said, are “founders come to us and say we founded our company to do x and would like to take it to the next level.” In his view, this strategy has been a key ingredient to eBay’s and PayPal’s success. Acquisitions, in his view, drive innovation inside a large company like eBay and bringing in founders as executives – and giving them monetary incentives to stay as well, of course – is a key part of this strategy. As for the details of these incentives, Donahoe noted that “most of the founders make money in the acquisition In some cases the acquisition price is tied to staying for a two-three year period. But yes – we provide incentives to stay. We provide good compensation, but at the end of the day, we need to create a culture where they can realize their visions.” He does, for example, regularly meet with founders to discuss the state of the company. These discussions have, for example, lead to the redesign of the eBay’s homepage. It’s that kind of impact,

Source: http://feedproxy.google.com/~r/Techcrunch/~3/1z-OedfswSw/

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Israeli airstrike in Gaza kills 1 Palestinian

(AP) ? An Israeli aircraft attacked a motorcyclist in Gaza on Tuesday, killing the rider and wounding two other people in the first deadly airstrike in the Palestinian territory since a truce was reached with Palestinian militants last November.

The Israeli military said the airstrike killed Haitham Mishal, whom it identified as a jihadi militant involved in the April 17 rocket attack on the southern Israeli resort town of Eilat.

But Ashraf al-Kidra, Gaza's Health Ministry spokesman, said Mishal was a Palestinian police officer.

In a statement, the Israeli military said Mishal "has been a key terror figure, specializing in weapons and working with all of the terror organizations in the Gaza Strip." It said he manufactured weapons and specialized in rockets and explosive devices that he sold to militant groups.

Israel and Gaza's Hamas rulers engaged in eight days of heavy fighting last November before reaching an Egyptian-brokered truce. Under the deal, Gaza militants pledged to halt rocket attacks on Israel, while Israel said it would halt a policy of assassinating wanted militants.

But after several months of calm, the truce has begun to unravel in recent weeks. Palestinian militants have sporadically fired rockets into open areas of southern Israel, while the Israeli air force has responded with airstrikes on training sites and open areas in Gaza.

Hamas is not believed to have been involved in the rocket fire, and small al-Qaida-influenced militant groups have claimed responsibility. But Israel has said it holds Hamas, as the ruling power in Gaza, to be responsible for all attacks out of the crowded seaside strip.

Israel said Mishal was involved in the jihadi group that claimed responsibility for the Eilat attack.

Israel viewed the rocket attack on Eilat, a normally tranquil oasis that borders the Red Sea and Egypt's Sinai desert, as an escalation. It accused Gaza militants of staging the attack, which caused no injuries, out of Egypt's lawless Sinai desert and threatened heavier retaliation.

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/cae69a7523db45408eeb2b3a98c0c9c5/Article_2013-04-30-Israel-Palestinians/id-dcb345e2bb1d41f4a2d88e07a94282be

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Bunker Hill

Nathaniel Philbrick retells the story of the bloodiest battle of the American Revolution, after which there was no turning back.

By David Holahan / April 29, 2013

Bunker Hill By Nathaniel Philbrick Viking Adult 416 pp.

Enlarge

Nantucket-based historian and skilled helmsman Nathaniel Philbrick has sailed yet again into the headwinds of an oft-told tale with Bunker Hill: A City, A Siege, A Revolution. Earlier, Philbrick had set his compass for "Custer?s Last Stand" and the "Mayflower."

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It was not always thus. A dozen years ago, Philbrick's breakout book, ?In the Heart of the Sea,? resurrected the long-forgotten tragedy of the Essex, whose demise at the hands of a leviathan served as the inspiration for Melville?s ?Moby Dick.? The doomed Nantucket whaler was as renowned in its century as the Titanic would be in the one to follow.

But absent such obscure yet compelling historical breezes, the more reliable trade winds of the past must suffice.? Besides, a good yarn is worth retelling. How many of us, after all, truly appreciate what happened at Bunker Hill? It was the bloodiest of all the battles of the Revolutionary War, which like so many American conflicts had yet to be declared when the colonists and the British clashed on June 17 of 1775. The Red Coats captured Bunker Hill from the Patriot militias on their third assault, but at a terrible cost and to no long-term advantage. They would abandon Boston and the hornets? nest that was Massachusetts in March of the following year.

After the skirmishes at Lexington and Concord in April of 1775, there were still Patriots who believed that reconciliation with Great Britain was possible. But after Bunker Hill, the Americans had crossed the Rubicon. British casualties exceeded 1,000. There was no more middle road. It was liberty or death time.

In retelling the incendiary tale of a city and a battle that sparked our revolution, the author introduces the reader to some famous, infamous, and not-so-famous characters. Future President John Quincy Adams was just seven when he and his mother Abigail watched and listened to the battle some miles distant. The moment would have a profound impact on Adams for the rest of his life. His father John was away in Philadelphia at the Continental Congress, while others, such as Dr. Joseph Warren, manned the front lines. George Washington would not appear to lead the New England fighters for more than two weeks after Bunker Hill.

Source: http://rss.csmonitor.com/~r/feeds/csm/~3/ARnHNnif_WQ/Bunker-Hill

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