Why physics is not a discipline

pattern9

Philip Ball writes: Have you heard the one about the biologist, the physicist, and the mathematician? They’re all sitting in a cafe watching people come and go from a house across the street. Two people enter, and then some time later, three emerge. The physicist says, “The measurement wasn’t accurate.” The biologist says, “They have reproduced.” The mathematician says, “If now exactly one person enters the house then it will be empty again.”

Hilarious, no? You can find plenty of jokes like this — many invoke the notion of a spherical cow — but I’ve yet to find one that makes me laugh. Still, that’s not what they’re for. They’re designed to show us that these academic disciplines look at the world in very different, perhaps incompatible ways.

There’s some truth in that. Many physicists, for example, will tell stories of how indifferent biologists are to their efforts in that field, regarding them as irrelevant and misconceived. It’s not just that the physicists were thought to be doing things wrong. Often the biologists’ view was that (outside perhaps of the well established but tightly defined discipline of biophysics) there simply wasn’t any place for physics in biology.

But such objections (and jokes) conflate academic labels with scientific ones. Physics, properly understood, is not a subject taught at schools and university departments; it is a certain way of understanding how processes happen in the world. When Aristotle wrote his Physics in the fourth century B.C., he wasn’t describing an academic discipline, but a mode of philosophy: a way of thinking about nature. You might imagine that’s just an archaic usage, but it’s not. When physicists speak today (as they often do) about the “physics” of the problem, they mean something close to what Aristotle meant: neither a bare mathematical formalism nor a mere narrative, but a way of deriving process from fundamental principles.

This is why there is a physics of biology just as there is a physics of chemistry, geology, and society. But it’s not necessarily “physicists” in the professional sense who will discover it. [Continue reading…]

Facebooktwittermail

New evidence that humans settled in southeastern U.S. far earlier than previously believed

Phys.org reports: The discovery of stone tools found in a Florida river show that humans settled the southeastern United States far earlier than previously believed — perhaps by as much as 1,500 years, according to a team of scientists that includes a University of Michigan paleontologist.

Michael Waters of Texas A&M University and Jessi Halligan of Florida State University led a research team that also included U-M’s Daniel Fisher and scientists from the University of Minnesota, University of Texas, University of Arizona, Stafford Research Laboratories in Colorado, Aucilla Research Institute in Florida, and Exeter and Cambridge universities in the United Kingdom.

A report on the team’s findings appears in Science Advances. [Continue reading…]

Facebooktwittermail

The long history of a short form

decay12

Ryan Ruby writes: For a word that literally means definition, the aphorism is a rather indefinite genre. It bears a family resemblance to the fragment, the proverb, the maxim, the hypomnema, the epigram, the mantra, the parable, and the prose poem. Coined sometime between the fifth and third centuries BC as the title for one of the books of the Corpus Hippocraticum, the Aphorismi were originally a compendium of the latest medical knowledge. The penultimate aphorism, “In chronic disease an excessive flux from the bowels is bad,” is more representative of the collection’s contents than the first — “Life is short, art is long” — for which it is best known.

But in those six words lies a clue to the particular space aphorisms were supposed to define. Thanks to a semantic slippage between the Greek word techne and its English translation (via the Latin ars), the saying is often taken to mean that the works of human beings outlast their days. But in its original context, Hippocrates or his editors probably intended something more pragmatic: the craft of medicine takes a long time to learn, and physicians have a short time in which to learn it. Although what aphorisms have in common with the forms listed above is their brevity, what is delimited by the aphorism is not the number of words in which ideas are expressed but the scope of their inquiry. Unlike Hebrew proverbs, in which the beginning of wisdom is the fear of God, the classical aphorism is a secular genre concerned with the short span of time we are allotted on earth. Books of aphorisms are also therapeutic in nature, collections of practical wisdom through which we can rid ourselves of unnecessary suffering and achieve what Hippocrates’ contemporary Socrates called eudaimonia, the good life.

This is certainly what the Stoic philosopher Arrian had in mind when he whittled down the discourses of his master, Epictetus, into a handbook of aphorisms. The Enchiridion is composed of that mixture of propositional assertion and assertive imperative that is now a hallmark of the form. In it, Epictetus, a former slave, outlines the Stoic view that, while “some things are in our control,” most things are ruled by fate. The way to the good life is to bring what is up to us — our attitudes, judgments, and desires — into harmony with what is not up to us: what happens to our bodies, possessions, and reputations. If we accept that what does happen must happen, we will never be disappointed by vain hopes or sudden misfortunes. Our dispositions, not our destinies, are the real source of our unhappiness. [Continue reading…]

Facebooktwittermail

‘Nobody knew what you would see on the other side of a mountain’

mt-tam

Carl Zimmer writes: As a boy growing up in Denmark, Eske Willerslev could not wait to leave Gentofte, his suburban hometown. As soon as he was old enough, he would strike out for the Arctic wilderness.

His twin brother, Rane, shared his obsession. On vacations, they retreated to the woods to teach themselves survival skills. Their first journey would be to Siberia, the Willerslev twins decided. They would make contact with a mysterious group of people called the Yukaghir, who supposedly lived on nothing but elk and moose.

When the Willerslev twins reached 18, they made good on their promise. They were soon paddling a canoe up remote Siberian rivers.

“Nobody knew what you would see on the other side of a mountain,” said Eske Willerslev, who is now 44. “There were villages on the maps, and you wouldn’t even see a trace of them.”

Dr. Willerslev spent much of the next four years in Siberia, hunting moose, traveling across empty tundra and meeting the Yukaghirs and other people of the region. The experience left him wondering about the history of ethnic groups, about how people spread across the planet.

A quarter of a century later, Dr. Willerslev is still asking those questions, but now he’s getting some eye-opening answers.

As the director of the Center for GeoGenetics at the University of Copenhagen, Dr. Willerslev uses ancient DNA to reconstruct the past 50,000 years of human history. The findings have enriched our understanding of prehistory, shedding light on human development with evidence that can’t be found in pottery shards or studies of living cultures. [Continue reading…]

Facebooktwittermail

Countering American anti-intellectualism involves more than challenging ignorance

The Washington Post reports on President Obama’s commencement address at Rutgers University on Sunday: The president throughout his speech decried a strain of anti-intellectualism in American politics that he said rejects science, reason and debate. “These are things you want in people making policy,” Obama said to laughter. “That might seem obvious.”

At one point, clearly referring to Trump and congressional Republicans who have decried efforts to combat global warming, Obama warned that “in politics and in life, ignorance is not a virtue.”

“It’s not cool to not know what you are talking about,” he said. “That’s not keeping it real or telling it like it is. That’s not challenging political correctness. That’s just not knowing what you are talking about.”

Throughout the year, Obama has turned again and again in speeches to the obligations that come with citizenship and the need for a more reasoned and respectful political debate at a moment when the country’s politics have never seemed more vulgar and poisonous. [Continue reading…]

Given Obama’s youthful audience, it’s hardly surprising that he would appeal to their desire to be cool, but that itself strikes me as being part of the problem.

Intellectual development hinges less on knowing what you are talking about, than it requires the cultivation of curiosity.

It’s got more to do with asking the right questions, than knowing the right answers.

To be cool, on the other hand, suggests never being caught by surprise — as though to be surprised (which means to encounter the unexpected) must be a bad thing.

But no one can become so seasoned in life that they actually never encounter anything new. On the contrary, where the sense of surprise has been lost, nothing more is being learned. The process of digesting new information and new perceptions that modify ones understanding of the world, has atrophied. Thought, once malleable, has become fixed.

Those who claim they’ve seen it all before, have more likely just stopped looking.

The rancor in political debate which Obama criticizes, is itself not simply representative of a fractious political environment. It isn’t just that discourse is lacking in civility; it’s a reflection of the fears that inhibit creative political thinking.

When politics is strictly factionalized, orthodoxies rule. No one wants to challenge the conventional wisdom inside the camp to which they are aligned. Politics is then simply a power struggle between competing camps.

The intransigence we project onto our opponents is mirrored by the inflexibility on our side.

Facebooktwittermail

GOP leaders: ‘People don’t care’ about Trump’s woman problem

The Guardian reports: After a week of make-up meetings with Donald Trump, Republican party leaders have arrived at a new strategy to accommodate their presumptive presidential nominee: ignore his problematic attitude to women, his tax issues and his fluctuating positions on trade, immigration, foreign relations and a host of other topics, and instead embrace the will of Republican voters.

The switch was illuminated on Sunday, a day after the New York Times published a lengthy investigation into Trump’s alleged mistreatment and objectification of women in his personal life.

Reince Priebus, chair of the Republican National Committee, told Fox News Sunday that if voters have shown they are prepared to ride over issues surrounding the nominee’s behavior, so should the party.

“We’ve been working on this primary for over a year,” he said. “People don’t care. The question is, who is going to bring an earthquake to Washington DC?”

Trump, Priebus added, “represents something much different from the analysis of traditional candidates. Donald Trump is going to have to answer the question, but we’re in a year where nothing applies.

“It’s down to the bigger question: Who is going to blow up the system? That’s what this election is coming down to.” [Continue reading…]

Facebooktwittermail

Al Qaeda leaders turns to Syria, with a plan to challenge ISIS

The New York Times reports: Al Qaeda’s top leadership in Pakistan, badly weakened after a decade of C.I.A. drone strikes, has decided that the terror group’s future lies in Syria and has secretly dispatched more than a dozen of its most seasoned veterans there, according to senior American and European intelligence and counterterrorism officials.

The movement of the senior Qaeda jihadists reflects Syria’s growing importance to the terrorist organization and most likely foreshadows an escalation of the group’s bloody rivalry with the Islamic State, Western officials say.

The operatives have been told to start the process of creating an alternate headquarters in Syria and lay the groundwork for possibly establishing an emirate through Al Qaeda’s Syrian affiliate, the Nusra Front, to compete with the Islamic State, from which Nusra broke in 2013. This would be a significant shift for Al Qaeda and its affiliate, which have resisted creating an emirate, or formal sovereign state, until they deem conditions on the ground are ready. Such an entity could also pose a heightened terrorist threat to the United States and Europe.

Qaeda operatives have moved in and out of Syria for years. Ayman al-Zawahri, the group’s supreme leader in Pakistan, dispatched senior jihadists to bolster the Nusra Front in 2013. A year later, Mr. Zawahri sent to Syria a shadowy Qaeda cell called Khorasan that American officials say has been plotting attacks against the West.

But establishing a more enduring presence in Syria would present the group with an invaluable opportunity, Western analysts said. A Syria-based Qaeda state would not only be within closer striking distance of Europe but also benefit from the recruiting and logistical support of fighters from Iraq, Turkey, Jordan and Lebanon. [Continue reading…]

Facebooktwittermail

Al-Qaeda affiliates are threatening West Africa’s most peaceful cities

The Washington Post reports: In a city where nightclubs and mosques coexist peacefully, Islamist violence long felt like a foreign problem — something residents watched on news clips from the Middle East or other parts of ­Africa.

“We just didn’t worry very much about it,” said Abdullaye Diene, the deputy imam of the country’s largest mosque. “Here you can spend your nights drinking at the disco and then shake the hand of the imam.”

But Senegal and its neighbors are facing a new threat from extremists moving far from their traditional strongholds in northwest Africa. Since November, militant groups have killed dozens of people in assaults on hotels, cafes and a beachside resort in West Africa, passing through porous borders with impunity.

The attacks have occurred in countries that had been rebounding from political turbulence, such as Ivory Coast and Burkina Faso. Now fears of such bloodshed are growing in this pro-Western democracy, which serves as a ­regional hub for international ­organizations. [Continue reading…]

Facebooktwittermail

ISIS, growing stronger in Libya, sets its sights on fragile neighbor Tunisia

The Washington Post reports: The families arrived at the cemetery in the night carrying the bullet-riddled corpses of their sons and brothers, residents recalled. One by one, the bodies were placed in unmarked graves, outcasts even in death.

The dead men had been fighters for the Islamic State. All Tunisians, they had crossed into Libya to join the terrorist group’s affiliate there. In March, they returned with other radicalized Tunisians in an attempt to seize Ben Guerdane, a smuggling hub 20 miles from the border. Dozens of the militants were killed in fierce clashes with security forces, including at least 10 who were raised here in the southeastern corner of the country.

Only eight were buried in the cemetery.

“Some families refused to take the bodies,” said Samir Naqi, a senior police official.

That Ben Guerdane, long known as an incubator for jihadists, was not captured was a victory for Tunisia. But the attack and its aftermath revealed the North African nation’s fragility as it struggles to contain the toxic fallout from the Arab Spring uprisings five years ago, and represented an escalation in the Islamic State’s ambitions.

Tunisians form the largest contingent of foreign fighters in Syria and Iraq. But with U.S. and Russian airstrikes hammering them there, and travel bans and stricter border controls in place, more Tunisians are joining the Islamic State in Libya. Increasingly, Libya’s conflict is spilling into Tunisia, the only country to emerge as a functioning democracy after the revolutions. [Continue reading…]

The Guardian reports: Leading foreign ministers from Europe and the Middle East are to meet in Vienna on Monday under the joint chairmanship of the US and Italy to discuss how to bolster support for the UN-backed Libyan government in the face of deepening splits in the country over political legitimacy, oil resources and Islamic State.

Elaborate plans to send thousands of Italian-led troops to the area are either on hold, or have been abandoned. But the west is still desperate to find ways to strengthen the political authority of the Tripoli-based government since it will help create a single military Libyan force able both to defeat Isis and tighten the control of refugees leaving the lawless coastland for Italy.

Special forces from the US, UK, France and Italy are operating in various parts of Libya, sometimes backing different military forces and hindering efforts to reunite Libyan politics behind the UN government of Fayez al-Sarraj. [Continue reading…]

Facebooktwittermail

ISIS cancels fighters’ holidays as it prepares to defend Raqqa

The Telegraph reports: Isil has cancelled holidays for militants in its Syrian stronghold of Raqqa as it maximises available manpower ahead of a feared international assault on the city.

Over the past two weeks, the group has accelerated its drive to defend Raqqa, sources inside the area told The Telegraph, digging trenches alongside checkpoints and strengthening a network of underground bunkers.

“Isil cancelled holidays, increased the number of shifts, and asked all members to be present – even the administrators,” said a source in regular contact with civilians inside the city.

Although the extremist group is far from defeat, it is under pressure across several battlefronts, losing strongholds including the Iraqi city of Ramadi in December and the ancient town of Palmyra in March. As Kurdish and Syrian rebel forces prepare to edge towards Raqqa, the city is frequently the target of airstrikes by the US-led coalition, as well as the Syrian air force and Russian warplanes that began an air campaign in the country in late September.

In an attempt to block the view of circling drones, the militants have started hanging sheets across shop-fronts and homes. They are also believed to have moved several key headquarters underground. [Continue reading…]

Facebooktwittermail

Afghan president inching closer to peace deal which could later serve as a blueprint for a deal with the Taliban

The Washington Post reports: President Ashraf Ghani is inching closer to a peace deal with the leader of a militant group that, though largely inactive now, was a powerful force during Afghanistan’s civil war in the 1990s.

But a spokesman for the president said Sunday that Ghani has held off on finalizing the 25-point peace plan with warlord Gulbuddin Hekmatyar’s Hezb-i-Islami group because of “minor differences.”

Dawa Khan Menapal, the spokesman, said: “This is a process. There are some minor differences. It may take one day, maybe weeks or even longer.” The talks began in 2014.

Hekmatyar has been a thorn in the government’s side since the fall of the Taliban in 2001. But his group has been only marginally active in recent years. Its last major attack occurred in 2013, when a suicide bombing killed 15 people, including six U.S. soldiers.

Still, Ghani has been pursuing a peace plan with Hekmatyar, one that political analysts say would serve as a potential blueprint for a far more complicated deal with Taliban insurgents. [Continue reading…]

Facebooktwittermail

Israel tells France it’s not interested in multilateral peace talks

The Washington Post reports: French officials said Sunday that they will continue to press ahead with plans to host a multilateral Middle East peace conference later this year, despite hearing, in blunt language, that Israel doesn’t really like the idea.

French Foreign Minister Jean-Marc Ayrault met with Prime Minister Benjamin Netanyahu on Sunday to promote what diplomats are calling the “French Initiative,” a still evolving and admittedly vague diplomatic project that seeks to bring global attention to the Israeli-Palestinian conflict and find consensus among the international community on how to move forward with a two-state solution.

The French are planning to host about 30 foreign ministers — from Europe and the Middle East as well as Russia, China and India — at a preparatory meeting at the end of this month, which could lead to a peace conference later this year.

Neither Israel nor the Palestinians, who support the French Initiative, will attend the May meeting in Paris.

U.S. Secretary of State John F. Kerry has not said whether he would be there.

Israeli officials have been pressing Washington to pour cold water on the French effort, which seeks to fill the vacuum left behind by the Obama administration, which declared that it would not be making any major move to bring Israel and the Palestinians back to the negotiating table. [Continue reading…]

Facebooktwittermail

Kurdish militants reportedly shoot down Turkish security forces helicopter

The Washington Post reports: They were used to stalk Russian helicopters in Afghanistan, and the United States has worked hard to keep them out of chaotic Syria. But now Kurdish guerrillas battling Turkey’s security forces may now have shoulder-fired missiles — an acquisition analysts say will seriously challenge Turkish air power and potentially intensify fighting in the region.

On Saturday, media affiliated with the Kurdistan Workers’ Party (PKK), a leftist militant group battling the Turkish state, posted a video purporting to show a fighter downing a Cobra attack helicopter with a man-portable air-defense system — or MANPADS — in the mountains of southeastern Turkey on Friday morning. Arms observers said this is the first time they have seen PKK fighters successfully using MANPADS in their four-decade fight against the Turks.

About four minutes into the video, the fighter, clad in camouflage fatigues, crouches on a verdant hillside with the weapons system on his shoulder. When the launcher locks on its target — a helicopter whirring noisily on the horizon — the fighter stands to fire. The heat-seeking missile swoops through the air and strikes the Cobra’s tail, sending the aircraft spinning and eventually crashing into the mountainside. [Continue reading…]

Facebooktwittermail

Turkish military’s influence rises again

erdogan

The Wall Street Journal reports: After 13 years of being methodically marginalized during Recep Tayyip Erdogan’s tenure atop Turkish politics, the army is regaining its clout as the president sidelines his political rivals.

Turkey’s military, which has forced four civilian governments from power since 1960, is re-emerging as a pivotal actor alongside Mr. Erdogan, who has long viewed the army as a potentially dangerous adversary.

Mr. Erdogan’s moves to sideline political opponents — he forced out his handpicked prime minister this month amid a power struggle — has cleared the way for Turkey’s generals to play a greater role in shaping Mr. Erdogan’s attempts to extend his global influence.

Turkish generals are tempering Mr. Erdogan’s push to send troops into Syria, managing a controversial military campaign against Kurdish insurgents, and protecting Turkey’s relations with Western allies who view the president with suspicion. By steering clear of politics, they re-emerged as a central player in national security decisions.

“The Turkish military is the only agent that wants to put on the brakes and create checks-and-balances against Erdogan,” said Metin Gurcan, a former Turkish military officer who now works as an Istanbul-based security analyst.

It is in Syria where the military is most clearly acting as a check on the president. When Mr. Erdogan last year debated sending Turkish forces into Syria to set up a safe zone for those fleeing the fighting, military leaders expressed strong reservations, former Turkish officials and allies of Mr. Erdogan said. That, they said, helped put the idea on hold.

The debate returned last week when Mr. Erdogan threatened to send Turkish troops into Syria to end weeks of Islamic State rocket attacks on a Turkish border town.

Sending large numbers of combat troops into Syria is still a hard sell for the military, allies of Mr. Erdogan and U.S. officials said. If Turkey were to act without the support of the U.S. and its other North Atlantic Treaty Organization allies, the military fears its soldiers could be bombed by Russian jets and would face international condemnation.

“This is a very realistic headquarters. They know what Turkey’s armed forces are capable of. They’re not adventurous,” said Can Kasapoglu, a defense analyst with the Center for Economic and Foreign Policy Studies, a Turkish think tank.

The Turkish military and Mr. Erdogan’s press office both declined to discuss their relationship.

The restoration of the Turkish army’s influence has resurrected concerns all the way up to the presidential palace that generals might try to topple Mr. Erdogan, a polarizing figure whose extensive crackdown on domestic dissent has triggered alarm in Western capitals, according to people familiar with the matter. [Continue reading…]

Facebooktwittermail

America’s climate-change exodus

shadow16

Jeremy Miller writes: In a rumpled suit jacket and faded jeans, Giles Slade stands atop an earthen levee and looks out over a vast expanse of water. It’s mid-November, and the Fraser River runs gray and glasslike into the Salish Sea. Overhead, airplanes flash through low clouds, descending into Vancouver International Airport. To our backs is the city of Richmond, British Columbia, splayed out on the table-flat delta, the majority of its homes and buildings set just a few feet above sea level. “You can begin to see the scale of our problems from right here,” he says, waving a hand across the gray swath of water and sky.

Slade, 62, resembles a svelter John Goodman. He wears hip glasses, and his sentences are delivered in a calm, professorial baritone. But his mellow demeanor belies a deep anxiety, rooted in the threats posed by climate change to the Pacific Northwest, and to his flood-prone town of 190,000. He’s channeled that angst into a gripping work of non-fiction titled American Exodus (the title is an homage to An American Exodus, a book about the Dust Bowl published in 1939 by economist Paul Taylor, with photographs by Dorothea Lange). Slade’s book offers a disaster-movie account of the days ahead for North America  — a future defined by epic drought, megafires, colossal hurricanes, rising seas, and the massive human migrations that such events are likely to spawn.

The idea for the book dates back to the late 2000s, when Slade began to note numerous climate-driven migrations happening in the developing world. “There was a lot of material on climate migrations in Somalia and some other parts of the world,” he recalls. But at the time he could find no resources exploring how climate change might affect human populations in North America. Could things here reach a sort of climatic tipping point, Slade wondered, forcing people to move suddenly and in large numbers? “I was surprised to find that there were things that were already happening,” he says, mentioning Mexico and Central America, where prolonged drought, combined with violence and economic and political instability, has triggered the movement of tens of thousands of people northward over recent decades.

As he pored over the climate data, he became obsessed with one particular scenario. With drought intensifying in California, Slade envisioned a new Dust Bowl situation, in which tens of thousands of people evacuate the drought-ravaged southwestern United States and stream into the Pacific Northwest. Would the Oregon state line become like the U.S.-Mexico border? “That scenario,” Slade says, “seems closer and closer every day.”

For years, publishers weren’t interested in his ideas. “I was told by several U.S. publishers that climate change wasn’t happening,” he says. “Others viewed it as a boring disaster book with an unlikely prediction.” Things changed in October of 2012, when Superstorm Sandy blasted New York, forcing thousands of evacuations from the U.S.’s most populous and high-profile city. “I got a call and an offer the same week.”

One might be inclined to dismiss his predictions as the products of an overactive imagination (Slade spent his early years writing military novels for Harlequin Books)  —  that is, if the book weren’t so meticulously researched and reported. And then there’s the fact that Slade is no longer the only one talking in such stark terms about climate-driven migrations.

“What we’re seeing in Europe now with mass migrations, that will happen in California,” declared California Governor Jerry Brown last fall at a press conference. “Central America and Mexico, as they warm, people are going to get on the move.” In a recent talk to U.S. ambassadors, Secretary of State John Kerry painted a similar scene: “There’ll be climate refugees that all of you will be coping with at some point  — if not now, in the not-too-distant future.”

Recent data underscores these predictions. A study from the Centre for Research on the Epidemiology of Disasters estimated that, between 1994 and 2014, as many as 3.5 billion people worldwide were affected by flooding and drought. More recently, a study in the journal Science Advances estimated that four billion people  —  roughly two-thirds of the entire human population  — experience severe water shortages for at least one month out of every year.

And yet, here in the U.S., we tend to think of severe climate disruption as something that is happening elsewhere. According to recent Gallup polls, 60 percent of Americans accept that climate change is happening, and 57 percent believe that it is caused by human activities — but only 36 percent believe it poses a threat to their way of life. [Continue reading…]

Facebooktwittermail

Animals are us

elephant

Tania Lombrozo writes: Researchers have studied how people think about humans in relation to the natural world, and how the way we reason about humans and other animals changes over the course of development and as a function of education and culture.

The findings from this body of work suggest that by age 5, Western children growing up in urban environments are anomalous in the extent to which they regard humans as central to the biological world. Much of the rest of the world — including 3-year-olds, 5-year-olds in rural environments and adults from indigenous populations in South America — are more inclined to think about humans as one animal species among others, at least when it comes to reasoning about the properties that human and non-human animals are likely to possess.

To illustrate, consider a study by Patricia Herrmann, Sandra Waxman and Douglas Medin published in the Proceedings of the National Academy of Sciences in 2010. In one experiment, 64 urban children, aged 3 or 5, were asked a series of questions that assessed their willingness to generalize an unknown property from one object to another. For instance, they might be told that people “have andro inside,” and would then have to guess whether it’s right or wrong to say that dogs “have andro inside.”

The findings with 5-year-olds replicated classic work in developmental psychology and suggested a strong “anthropocentric” bias: The children were more likely to generalize from humans to non-humans than the other way around, consistent with a privileged place for humans in the biological world. The 3-year-olds, by contrast, showed no signs of this bias: They generalized from humans to non-humans and from non-humans to humans in just the same way. These findings suggest that an anthropocentric perspective isn’t a necessary starting point for human reasoning about the biological world, but rather a perspective we acquire through experience.

So what happens between the ages of 3 and 5 to induce an anthropocentric bias?

Perhaps surprisingly, one influence seems to be anthropomorphism in storybooks. [Continue reading…]

Facebooktwittermail

The birth and death of a landscape

Justin Nobel writes: To reach the youngest land in the United States you need a boat. Robert Twilley still vividly remembers the first time he made the trip. The Louisiana State University coastal ecologist piled into a 24-foot Boston Whaler with a bunch of geomorphologists from Minnesota and motored out to an arc of spongy islands along the central coast of Louisiana called the Wax Lake Delta. It was the best place to learn about how a delta develops. The way the land eventually stabilizes and becomes home to a unique ecosystem that changes as the delta gets older is a process that ecologists call succession. “Succession is one of the most fascinating concepts in ecology,” said Twilley, “though one of the hardest to study. But in the Wax Lake Delta you can see it all. Biologic communities link up A to Z; it is the holy grail of ecosystem succession.”

What is remarkable for scientists like Twilley is that with good muck boots, a small boat, and a non-aversion to intense sun, freak thunderstorms, biting insects, and devastating humidity, the aging process of this new land can be studied in a human lifespan. In just over 40 years, the Wax Lake Delta has grown from nothing to an area twice the size of Manhattan. Meanwhile, since the European settlement of North America, the Mississippi River Delta has lost approximately one-third of its original wetland area. A delta that was once about twice the size of Delaware and on maps resembled a head of cauliflower now looks more like a string bean. The slow death of the Mississippi River Delta has severe consequences, including reduced hurricane protection for cities like New Orleans. Not only an important food source for humans and wildlife, this rich habitat also helps filter pollutants and absorb excess nutrients that would deplete the oxygen in the Gulf of Mexico’s water.

As one delta dies, another one grows. The budding Wax Lake Delta has allowed Twilley and his team of researchers to study how a delta ages. First, the nascent delta takes shape as lobes of sediment accumulate below the water. The delta is born when it breaches the surface of the water. Colonized by plants that gradually enhance the soil’s organic content and raise its elevation, it rolls through childhood. And eventually, it grows into a landscape able to support large shrubs and black willow trees. “The delta is almost like an organism,” says Twilley, “There is a birthing, there is an aging process, and there is a death.” [Continue reading…]

Facebooktwittermail