Friday, June 24, 2011

So you want to live forever??


Most people look for the key to postponing old age in mega-antioxidant-loaded juices, extreme exercise regimens or expensive skin creams. Not Michael Rose. Rose, a professor of ecology and evolutionary biology at the University of California, Irvine and one of the panelists for the World Science Festival's From Dust to…The Radical New Science of Longevity session on Thursday, June 2, turned to fruit flies.
He and his colleagues have spent many fruit fly lifetimes studying the short-lived insects. And in the past thirty years, they have found that by manually selecting the longest-living flies from each generation of a group, they could extend the amount of time later generations lived. The experiment, which has been running since 1981, has generated fruit flies that live nearly four times the length of the first average flies.
But rather than argue for some sort of dystopian global human breeding program—which wouldn't likely see extreme benefits for hundreds or thousands of generations anyway—Rose has discerned a more subtle lesson. He found that fruit flies had genes that worked in two different ways to determine life span. The genes functioned one way in the flies' younger years and another way in their insect-lives' twilight years (which are closer to our weeks).
Other humble organisms are providing clues about the mysterious forces behind aging. Leonard Guarente, a professor at Massachusetts Institute of Technology, has helped to describe a type of genetic regulator known as sirtuins, which help control life span in worms and yeast.
But parsing all of this out in people—who live relatively long and hardly laboratory-controlled lives—has, of course, been quite a challenge.
Some researchers have focused their attention on cells in the body that stop dividing—and how these aged pieces contribute to disease. Judith Campisi, a professor at The Buck Institute for Research on Aging and a senior scientist at the Lawrence Berkeley National Laboratory, is investigating these senior cells' links to cancer and old age.
And Aubrey de Grey, editor-in-chief of Rejuvenation Research, is trying to put the pedal to the metal—or, perhaps more accurately, the antilock breaks—on aging. He's pioneered an approach called SENS: "Strategies for Engineered Negligible Senescence" that promises to mend tissue damaged in the course of our everyday eating, living and breathing.
Come spend an hour and a half of your life to see Rose, Guarente, Campisi, and de Grey discuss the ways science is untangling the cause of—and possible cures for—this pesky thing called mortality.

Wednesday, June 22, 2011

Free Tools for making Infographics


It's not enough to simply write about data any longer; the world wants visuals. While there are many professional information designers making a name for themselves, such as Nicholas Felton of Feltron.com, the majority of these digital artists are up to their eyeballs in high-paying work. Where does this leave you? Well, if you want to spruce up your documents, blog posts, and presentations, there are some free tools online that can help.
This IBM Research tool gives you two choices: an option to browse through existing sets of data, or use your own. The public database includes everything from population density across the U.S. to Internet browsers by popularity. If you have your own data on hand, you can upload it to Many Eyes and craft your own visualization. The best part of this tool is that you have many different options insofar as the final product, from creating a world map to a network diagram.
Like IBM, Google has made a public version of one of its research tools. The search-engine company's version is called Public Data Explorer.  It also lets you choose from existing data sets (which are numerous and neatly categorized). For example, if you want to compare the population between different U.S. states, it's a simple process that involves checking off your locations and choosing the type of chart (data is pulled from U.S. Census Bureau). To input your own data, upload your information (and if you choose to, you can make your dataset public for others to see and use). An added bonus, these charts can be embedded on your website or blog.
There are many occasions when a Venn Diagram is the perfect way to describe a concept or compare relationships among a few different things. With Hohli, you can create such a chart and customize its look and feel. Aside from specifying a title, choosing your data points, and altering the background, you can also share the time on multiple social media sites. Hohli also allows you to create other charts, including scatter plots and other line charts.
Although this tool describes itself as a "toy" for generating word clouds, it can be an effective service to spruce up your work. For example, if you're creating a presentation for a client that is looking to rebrand online, you can submit the company's URL into Wordle so it spits out a colorful design of the most popular words used on their website. You can also create your own word clouds, just add text or keywords that you want to use.
This is a new tool, currently in private beta, that will allow you to create and share infographics. From a first look on YouTube, this new service will be a great resource to create a compelling storytelling visualization. In other words, the above tools are fairly standard in terms of outputting sets of data, but Visual.ly will make it easier to create more robust infographics that are less scientific and more user friendly. To get on the invite list to give Visual.ly a try, visit their website.

5 LinkedIn tips one Should try


Here are five LinkedIn tips you should try today.
1. Use "Signal" to discover relevant news and information
When you're logged in to LinkedIn, take a tour of a new-ish feature called Signal. This tool lets you easily monitor updates within your network, but more importantly you can filter information so you can also see what people in your extended circle (2nd and 3rd connections) are posting. You can also do the same filtering by industry or location, so you can weed through the noise.
2. Export your connections
Go to "My Connections" to view a list of all your LinkedIn contacts. This address book is a really handy way to get email addresses and updated information, but most importantly you can export this list. At the bottom of the page click "Export Connections," which will put all this contact info in a format suitable for your address book (Microsoft Outlook, Yahoo! Mail, etc.).
3. Create a resume
If you've already filled out your LinkedIn profile information, it's easy to use it to create a foundation for a resume. The Resume Builder will suck in your professional past and you can use any of the pre-built templates to make it look good. From an Executive style presentation to a more casual layout, this tool will take some of the pain out of the resume building process. You can export the resume, share it easily, and edit as you wish.
4. Start and use groups
While, unlike Twitter, you might not find celebrities hanging out, you will find a wealth of relevant conversations within LinkedIn groups. Creating a group is a cinch and a great opportunity to jump-start a good business chat. If you don't know what group to join, click on "Groups You May Like" to get you started. To learn more about the benefits of Groups and what LinkedIn has planned for this feature in the future, visit their online tutorial.
5. Customize your URL
Custom domain names have been all the rage for a while on Facebook, but you can do the same on LinkedIn. Visit the "Edit Profile" tab and click "Public Profile" at bottom left. Once you're on this page, on the far right you will see "Your current URL." This is where you can customize your LinkedIn domain name so you can better brand your account.

The Concorde Of The Future: Paris To Japan In Just 2.5 Hours, Emissions Free


Zehst
Biofuel-powered passenger aircraft are becoming more and more common. But what if you mashed that up with a rocket engine? That's essentially what the Zero Emission Hypersonic Transport (Zehst) project by European defense manufacturer EADS is all about. Zehst could be the rocketplane that flies our kids around the world in the same time it takes us to drive to work.
The Concorde was retired nearly eight years ago, and the SR71 Blackbird concluded flights 22 years ago, but if they'd got together in the 1980s and had an airborne offspring they would've produced something very much like Zehst. The aircraft was unveiled yesterday before the influential Paris airshow, and EADS seems intent that it's no pie-in-the-sky experiment: Zehst will hopefully be flying in prototype form by 2020 and in service 30 years after that.
You may be thinking "zero emissions and a rocket plane does not compute" but here's why it kinda makes sense: Zehst has seven engines hidden inside its nacelles, two that breathe air and work like conventional jet aircraft's do, two giant ramjets, and three that burn liquid hydrogen and oxygen like conventional rocket engines do. It also relies on existing well-known technologies, materials, and engine designs. So, while it's going to take 40 years to get off the ground, it's not purely science fiction.
The four air-breathers burn biofuel, which could be based on algae--a technology that's getting more and more plausible. Indeed Boeing just flew its newest aircraft, the 747-8 freighter, to Paris by using biofuel. This gives them an extremely low eco-footprint compared to conventional jet fuel. Meanwhile the rocket engines burn oxygen and hydrogen, like the Space Shuttle, which leaves a polluting wake that consists only of superheated steam (making and storing the LH2 and LOX in the first place does take energy, which currently isn't necessarily the most environmentally friendly practice--but by 2050 it certainly will be).
The idea is the two jet engines propel the vehicle at low speeds on takeoff and landing. When it's accelerating into the air, three rockets take over to push it higher and faster in a boost phase. As the aircraft moves fast enough to ignite ramjets, two of these take over the power production as it continues to rise. After reaching its peak altitude and speed it glides, and then slows as it dives toward a landing.
Since Zehst needs to carry seven engines in various configurations, as well as its rocket fuel inside it (like Concorde or Blackbird and unlike the Space Shuttle), there's reduced space for passengers. But the 50 to 100 folk inside the aircraft will get the chance to fly up to 20 miles in altitude and travel at Mach 4.5 (around 3,000 miles per hour), which is pretty incredible--though will probably cost quite a bit of coin.
Sadly Zehst doesn't fly high enough for its passengers to be called astronauts. But with all that speed--and, if the Concorde is any role model, luxury--it will hardly matter. The one worry is that this complex design will suffer the same bureaucratic and technical screw-ups as its speedy predecessor.

Monday, June 20, 2011

Five Predictions For The Future Of Energy


People love to prognosticate about how the world will power itself in the future. But only one person can be right. Here's some of the possible ways the next 50 years might turn out.


It seems like a new prediction pops up for how we will use renewable energy in the coming decades every day. Will we be using all solar in two years? In five? Will we use more nuclear, or less? Experts love making predictions. Here, we round up some of the most exciting (and upsetting) predictions that have been made in the last few months. We don't have a crystal ball to say which of these will end up being correct, but with so many options, someone is going to look like a genius.
Prediction: Solar Energy Will Be More Economical Than Fossil Fuels In 10 Years
So says the Institute of Electrical and Electronic Engineers (IEEE). According to the organization, solar PV systems may end up being the most economical form of electricity within the decade--but only if the solar industry continues to rapidly improve solar cell efficiency and create economies of scale. "As the cost of electricity from solar continues to decrease compared to traditional energy sources we will see tremendous market adoption, and I suspect it will be a growth limited only by supply. I fundamentally believe that solar PV will become one of the key elements of the solution to our near- and long-term energy challenges," said James Prendergast, IEEE Executive Director, in a statement. But there's still a long way to go--renewable energy sources currently are responsible for just 13% of worldwide energy usage.
Prediction: Solar Power Will Be As Cheap As Coal in Two Years
No need to wait a decade--the researchers over at Bloomberg New Energy Finance thinkthat solar power could reach grid parity (the point at which solar is as cheap for utilities as fossil fuels) in the next two years. In ultra-sunny regions like the Middle East, the researchers contend that solar power is already competitive. Coal currently costs approximately 7 cents a watt, compared to 22 cents for solar. By 2013, these costs are expected to be equal. But what of our natural gas glut? Will that slow solar development?
Prediction: Natural Gas Will Kill Renewables
Natural gas produced from shale will kill the economics of renewable energy in the coming years, according to a report from Reuters. As solar and wind prices continue to fall, natural gas will stay on top. Because even if, say, offshore wind costs the same as natural gas by 2015 (as predicted by German utility E.ON), there is still an extra cost of building backup power for when the wind doesn't blow. As long as prices are cheap, it's simply easier for utilities to opt for always-on fossil fuels instead of intermittent renewable sources.
Prediction: Renewable Energy Use Will Grow, But So Will Coal And Natural Gas Use
The good news: The International Energy Association believes that renewable energy will grow from 8% of total energy use in 2009 to 13% in 2035. The bad news: Coal and natural gas will also grow--energy generation from coal will increase by 25% from 2009 to 2035, and shale gas production will grow nearly fourfold during that same time frame. So much for cutting down on carbon emissions.
Prediction: We Could Power 100% Of the Planet With Renewable Energy By 2050
Sure, it's unlikely, but a Stanford research team believes that we could power the planet entirely with renewable energy by 2050--if we mandate that all new energy production plants use renewable energy by 2030 and convert existing plants by 2050. In this happy-go-lucky prediction, 90% of energy production would come from wind and solar energy, and the other 10% would come from hydroelectric, geothermal, and wave/tidal power. Cars, trains, ships, and other forms of transportation would use hydrogen-powered fuel cells, and aircraft would run on hydrogen fuel. The only problem: somehow beating back the fossil fuel industry to a point of nonexistence. This is a pipe dream at best--but one that we should at least aspire to. Check back in 2050.

Caught in the Act: A Black Hole Scuttles a Star

Caught in the Act: A Black Hole Scuttles a Star
A black hole 3.8 billion light-years from Earth is shown in this artist's representation tearing apart a star that drifted within its gravitational pull. This scenario is part of a new explanation for one of the brightest events ever recorded by astronomers. After consuming the star the black hole released a high-energy beam of gamma rays and x-rays, according to Joshua Bloom of the University of California, Berkeley, and his associates. The research, based on data collected by NASA's orbiting Swift Gamma-Ray Burst observatory, is published in the June 16 issue of Science. In the same issue, Andrew Levan of the University of Warwick and his colleagues pinpoint the beam's source as a black hole at the center of a distant galaxy.

The signal that the Swift satellite received lasted longer than any previously detected gamma ray burst. Rather than declining in intensity after a few minutes as is typical, the brightness of the gamma rays continued to fluctuate and spike over the course of two days. Meanwhile, the x-ray flare's afterglow remained bright for more than two weeks.

The beam's longevity and intensity suggest that a massive black hole, more than a million times heavier than the sun, released two concentrated jets of energy after pulling a star apart. One of the beams pointed directly toward Earth whereas the other traveled off in the opposite direction. The beam's intensity fluctuated as the black hole sucked in leftover pieces of the doomed star.

High Wired: Does Addictive Internet Use Restructure the Brain?


Kids spend an increasing fraction of their formative years online, and it is a habit they dutifully carry into adulthood. Under the right circumstances, however, a love affair with the Internet may spiral out of control and even become an addiction.
Whereas descriptions of online addiction are controversial at best among researchers, a new study cuts through much of the debate and hints that excessive time online can physically rewire a brain.
The work, published June 3 in PLoS ONE, suggests self-assessed Internet addiction, primarily through online multiplayer games, rewires structures deep in the brain. What's more, surface-level brain matter appears to shrink in step with the duration of online addiction.
"I'd be surprised if playing online games for 10 to 12 hours a day didn't change the brain," says neuroscientist Nora Volkow of the National Institute on Drug Abuse, who wasn't involved in the study. "The reason why Internet addiction isn't a widely recognized disorder is a lack of scientific evidence. Studies like this are exactly what is needed to recognize and sette on its diagnostic criteria," if it is a disorder at all, she says.*
Defining an addiction
Loosely defined, addiction is a disease of the brain that compels someone to obsess over, obtain and abuse something, despite unpleasant health or social effects. And "internet addiction" definitions run the gamut, but most researchers similarly describe it as excessive (even obsessive) Internet use that interferes with the rhythm of daily life.
Yet unlike addictions to substances such as narcotics or nicotine, behavioral addictions to the Internet, food, shopping and even sex are touchy among medical and brain researchers. Only gambling seems destined to make it into the next iteration of theDiagnostic and Statistical Manual of Mental Disorders, or DSM, the internationally recognized bible of things that can go awry with the brain.
Nevertheless, Asian nations are not waiting around for a universal definition of Internet addiction disorder, or IAD.
China is considered by many to be both an epicenter of Internet addiction and a leader in research of the problem. As much as 14 percent of urban youth there—some 24 million kids—fit the bill as Internet addicts, according to the China Youth Internet Association. By comparison, the U.S. may see online addiction rates in urban youth around 5 to 10 percent, say neuroscientists and study co-authors Kai Yuan and Wei Qin of Xidian University in China.
The scope of China's problem may at first seem extraordinary, but not in the context of Chinese culture, says neuroscientist Karen M. von Deneen, also of Xidian University and a study co-author.
Parents and kids face extreme pressure to perform at work and in school, but cheap Internet cafes lurk around the corner on most blocks. Inside, immersive online game realities like World of Warcraft await and allow just about anyone to check out of reality.
"Americans don't have a lot of personal time, but Chinese seem to have even less. They work 12 hours a day, six days a week. They work very, very hard. Sometimes the Internet is their greatest and only escape," according to von Deneen. "In online games you can become a hero, build empires, and submerge yourself in a fantasy. That kind of escapism is what draws young people."
Out of sight of parents, some college kids further cave to online escapism or use gaming to acquire resources in-game and sell them in the real world. In a recent case Chinese prison wardens allegedly forced inmates into the latter practice to convert digital gold into cold-hard cash.
Several studies have linked voluntary and excessive online use to depression, poor school performance, increased irritability and more impulsiveness to go online (confounding addicts' efforts, if they want to at all, to stop pouring excessive time into online games). To study the effects of possible Internet addiction on the brain, researchers began with the Young Diagnostic Questionnaire for Internet addiction.
This self-assessment test, created in 1998 by psychiatrist Kimberly Young of Saint Bonaventure University in New York State, is an unofficial standard among Internet addiction researchers, and it consists of eight yes-or-no questions designed to separate online addicts from those who can manage their Internet use. (Questions range from, "Do you use the Internet as a way of escaping from problems or of relieving an anxious mood?" to "Have you taken the risk of losing a significant relationship, job, educational or career opportunity because of the Internet?".)
The China-based research team picked 18 college-age students who satisfied addict criteria, and these subjects said they spent about 10 hours a day, six days a week playing online games. The researchers also selected 18 healthy controls who spent less than two hours a day online (an unusually low number, says von Deneen). All of the subjects were then plopped into an MRI machine to undergo two types of brain scans.
Brain drain
One set of images focused on gray matter at the brain's wrinkled surface, or cortex, where processing of speech, memory, motor control, emotion, sensory and other information occurs. The research team simplified this data using voxel-based morphometry, or VBM—a technique that breaks the brain into 3-D pixels and permits rigorous statistical comparison of brain tissue density among people.
The researchers discovered several small regions in online addicts' brains shrunk, in some cases as much as a 10 to 20 percent. The affected regions included the dorsolateral prefrontal cortex, rostral anterior cingulate cortex, supplementary motor area and parts of the cerebellum.
What's more, the longer the addiction's duration, the more pronounced the tissue reduction. The study's authors suggest this shrinkage could lead to negative effects, such as reduced inhibition of inappropriate behavior and diminished goal orientation.
But imaging neuroscientist Karl Friston of University College London, who helped pioneer the VBM technique, says gray matter shrinkage is not necessarily a bad thing. "The effect is quite extreme, but it's not surprising when you think of the brain as a muscle," says Friston, who was not involved in the study. "Our brains grow wildly until our early teens, then we start pruning and toning areas to work more efficiently. So these areas may just be relevant to being a good online gamer, and were optimized for that."
(Friston says London taxi drivers provide a telling comparative example of the brain's ability to reshape itself with experience. In the 2006 study, researchers compared taxi drivers' brains with those of bus drivers. The former showed increased gray matter density in their posterior hippocampi—a region linked to maplike spatial navigation and memory. That probably comes as no surprise to London cabbies, who spend years memorizing a labyrinthine system of 25,000 streets, whereas bus drivers have set routes.)
As another crucial part of the new study on Internet addiction, the research team zeroed in on tissue deep in the brain called white matter, which links together its various regions. The scans showed increased white matter density in the right parahippocampal gyrus, a spot also tied to memory formation and retrieval. In another spot called the left posterior limb of the internal capsule, which is linked to cognitive and executive functions, white matter density dropped relative to the rest of the brain.
Disorder under construction
What the changes in both white and gray matter indicate are murky, but the research team has some ideas.
The abnormality in white matter in the right parahippocampal gyrus may make it harder for Internet addicts to temporarily store and retrieve information, if a recent study is correct. Meanwhile, the white matter reduction in the left posterior limb could impair decision-making abilities—including those to trump the desire to stay online and return to the real world. The long-term impacts of these physical brain changes are even less certain. Rebecca Goldin, a mathematician at George Mason University and director of research for STATS, says the recent study is a big improvement over similar work published in 2009. In this older study a different research group found changes in gray matter in brain regions of Internet addicts. According to Goldin, however, the study lacked reliable controls.
The sample sizes of both studies were small—fewer than 20 experimental subjects each. Yet Friston says the techniques used to analyze brain tissue density in the new study are extremely strict. "It goes against intuition, but you don't need a large sample size. That the results show anything significant at all is very telling," Friston notes.
In the end all of the researchers emphasized significance only goes so far in making a case for IAD as a true disorder with discrete effects on the brain. "It's very important that results are confirmed, rather than simply mining data for whatever can be found," Goldin says.

Leap Seconds May Hit a Speed Bump

For most of human history, we have defined time through the movements of planets and stars. One day is the time it takes the Earth to rotate about its axis, one year the duration of a single orbit about the sun. But in January 2012, the way we think of time may change.

In order to keep the time determined by Earth's motion in line with the seconds measured by atomic clocks, the International Earth Rotation and Reference Systems Service inserts "leap seconds" into the calendar. But leap seconds may fall out of favor after next year's World Radiocommunication Conference, run by the UN's International Telecommunication Union (ITU). A group of astronomical scientists and engineers, led by David Finkleman of the Center for Space Standards & Innovation, drew attention to these deliberations in a June 16 post to arXiv.org, a pre-print blog for the mathematics and physical sciences. The essay is also published in the July-August issue of American Scientist.

Most societies require a universal definition of time—one minute in Texas must last the same length as one minute in New York. If there is one very accurate clock, the time it keeps can be broadcast at regular intervals to help keep all watches ticking in time. In the U.S., for example, the National Institute of Standards and Technology (NIST) uses the resonant frequency of cesium-133 atoms in the NIST-F1 Cesium Fountain Atomic Clock to keep time so accurately that even if it ran for 60 million years, NIST-F1 wouldn't drop or add a single second.

NIST-F1 is one of several international atomic clocks used to define international civil time (dubbed Coordinated Universal Time, or UTC), a job they perform a little too well. In fact, atomic clocks are actually more stable than Earth's orbit—to keep clocks here synched up with the motion of celestial bodies, timekeepers have to add leap seconds. The use of a leap year, adding a day to February every four years, locks the seasons, which result from Earth's orbit about the sun and the planet's tilt as it orbits, into set places in the civil calendar. Similarly, leap seconds ensure that the time it takes Earth to spin 360 degrees is equal to one day as defined by humans and their atomic clocks. Most recently, an extra second was tacked on to universal time on December 31, 2008.

However, since 1999, the Radiocommunication Sector of the ITU has been proposing the elimination of leap seconds from the measurement of UTC. Although the organization did not participate in the creation of the current leap second system, the radio waves it regulates are used to transmit UTC, giving it some influence.

Getting rid of leap seconds would certainly make it easier to calculate UTC, but this measure would also decouple astronomical time from civil time: The time measured by atomic clocks would gradually diverge from the time counted out by the movement of Earth through space. Eventually, one year will no longer be the length of Earth's orbit around the sun. Instead, it will be equivalent to a certain number of cycles of radiation from the cesium-133 atom (almost a billion billion cycles, to be precise).

These discrepancies will be extremely relevant to astronomers, who will need to keep track of two different times if the leap seconds proposal is adopted. In addition, keeping time based only on atomic clocks' measurements will give time itself a different meaning. After hundreds of years of letting planetary and lunar motion define time, we will shrink our scale, and let atoms determine it instead.

Fact or Fiction: Do Babies Resemble Their Fathers More Than Their Mothers??

Recent studies do not support the claim of an enhanced resemblance between fathers and their young offspring
A common bit of parenting folklore holds that babies tend to look more like their fathers than their mothers, a claim with a reasonable evolutionary explanation. Fathers, after all, do not share a mother's certainty that a baby is theirs, and are more likely to invest whatever resources they have in their own offspring. Human evolution, then, could have favored children that resemble their fathers, at least early on, as a way of confirming paternity.

The paternal-resemblance hypothesis got some scientific backing in 1995, when a study in Nature by Nicholas Christenfeld and Emily Hill of the University of California, San Diego, showed that people were much better at matching photos of one-year-old children with pictures of their fathers than with photos of their mothers. (Scientific American is part of Nature Publishing Group.)

Case closed? Hardly. "It's a very sexy result, it's seductive, it's what evolutionary psychology would predict—and I think it's wrong," says psychologist Robert French of the National Center for Scientific Research in France. A subsequent body of research, building over the years in the journal Evolution & Human Behavior, has delivered results in conflict with the 1995 paper, indicating that young children resemble both parents equally. Some studies have even found that newborns tend to resemble their mothers more than their fathers.

In a 1999 study published in Evolution & Human Behavior, French and Serge Brédart of the University of Liège in Belgium set out to replicate the paternal-resemblance finding and were unable to do so. In a photo-matching trial with pictures of one-, three- and five-year-old children and their parents, subjects identified mothers and fathers equally well.

A more recent study in the same journal employed a larger set of photos than were used by either Christenfeld and Hill or Brédart and French in their studies and still concluded that most infants resemble both parents equally. "Our research, on a much larger sample of babies than Christenfeld and Hill's, shows that some babies resemble their father more, some babies resemble their mother more, and most babies resemble both parents to about the same extent," says Paola Bressan, a psychologist at the University of Padova in Italy who co-authored the 2004 study. Bressan added that, to the best of her knowledge, "no study has either replicated or supported" the 1995 finding that babies preferentially resemble their fathers.

Two other studies in Evolution & Human Behavior, one in 2000 and one in 2007, found that newborns actually look more like their mothers than their fathers in the first three days of their lives, as judged by unrelated assessors. But the babies' mothers tend to say just the opposite, emphasizing the child's resemblance to the father. That, too, has a possible evolutionary explanation, according to D. Kelly McLain of Georgia Southern University and his co-authors of the 2000 study. "The bias in how mothers remark resemblance does not reflect actual resemblance and may be an evolved or conditioned response to assure domestic fathers of their paternity," the researchers wrote.

McLain and his colleagues even speculated that evolutionary pressures may have actually reduced the amount of paternal resemblance in newborns, thus ensuring that a putative father will care for a child even if the father has been cuckolded. That both high and low degrees of paternal resemblance have ready explanations highlights one of the challenges in linking subtle human features to changes that played out over millions of years of evolution. "It's kind of hard to distinguish 'just-so' stories from things that are really a product of evolution," French says.

Friday, June 17, 2011

The frenemies


Have you ever had a friend who makes plans to hang out but cancels when a better offer comes along? Or a buddy who helped you through a bad breakup, then flirted with your ex? To scientists, these problematic pals are known as ambivalent friends. To a more slang-savvy crowd, they are called “frenemies.”
Either term has come to describe a range of complicated relationships—those that boost you up and bring you down, for any of a variety of reasons. They include the well-meaning friend who is overly competitive, the pal who is a pillar of support when times are tough but cannot quite take pleasure in your successes, and the college buddy who drops everything to lend you a hand when you need one but gossips about you later.
In these troublesome relationships, qualities such as warmth and understanding go hand-in-hand with criticism, jealousy or rejection. “It’s a friend who drives you nuts,” says Karen Fingerman, a psychologist at Purdue University. “You love them, you don’t want to lose them, but they’re really a pain.”
Researchers have only recently begun examining these mixed-emotion associations. So far they are finding that such ties have negative effects on mental and physical well-being, boosting blood pressure and risk of depression while lowering resistance tostress. But if you want to keep your frenemies—and most people do—you can minimize these effects by buffering your interactions with the mixed-weather friends and con­sidering impartial reasons for their hurtful behavior.
Quality over Quantity
Humans are an extremely social species, and a friendless existence has many drawbacks, including depression, hypertension and cognitive decline. But if you want to be happy (and by extension, healthy), having lots of friends is much less important than having good ones. In a 2006 study psychologists Meliksah Demir and Lesley Weitekamp, then both at Wayne State University, gave 423 college students questionnaires about their personality, their happiness level, and the quality and number of their friendships. The researchers defined quality friendships as those scoring high on help, intimacy, self-validation, reliable alliance, emotional security and stimulating companionship. Fifty-eight percent of the variance in happiness could be attributed to the quality of a person’s friendships, compared with 55 percent for personality. The number of friends, on the other hand, had no significant effect on how happy a subject was.
From this angle, frenemies are problematic. No friendship is perfect, of course. But frenemies are consistently imperfect, scoring low on factors such as reliable alliance and self-validation, for example. And once you develop ambivalent feelings for a person, “future in­teractions with that person may be judged through that lens,” says psychologist ­Julianne Holt-Lunstad of Brigham Young University. In other words, you are less able to overlook a thoughtless comment made by a frenemy than one made by someone you think of as supportive.
Our lives are riddled with frenemies. From surveys asking people to assess their relationships, Holt-Lunstad and University of Utah psychologist Bert Uchino have found that, on average, about half a person’s social network is made up of ambivalent ties. Many are in the family. Fingerman has found that people are likely to view spouses, parents, children and siblings with more ambivalence than friends and acquaintances. One reason: it is much harder to swap out a family member than a friend, no matter how troublesome he or she is. In addition, even irritating family members often provide support and warmth you cannot afford to give up.
Unhealthy Ties
Ambivalent relationships may do more than dishearten. In a study published in 2003 Holt-Lunstad and Uchino asked 102 male and female volunteers to wear blood pressure monitors for three days. Every time a subject had a social interaction lasting more than five minutes, he or she would describe it in a diary and rate the quality of that relationship. Not surprisingly, blood pressure readings were typically higher when individuals encountered ambivalent friends than when they saw supportive friends. But intriguingly, blood pressure was also more elevated in the presence of ambivalent friends than it was with people the subjects disliked but could not avoid (such as classmates or co-workers). You expect very little from someone you loathe, Holt-Lunstad surmises, whereas ambivalent friends, unpredictable as they are, often raise your hopes only to dash them. And that disappointment, or fear of it, can negatively affect your health.

Other research suggests that ambivalent friends can lower resistance to stress. In 2001 Holt-Lunstad and Uchino reported asking 133 individuals aged 30 to 70 to rate important members of their social networks according to how helpful or upsetting they were. Then the volunteers completed two stressful exercises: a mental arithmetic task and a speech defend­ing themselves against a false accusation. The more ambivalent friends a person had, the higher his or her heart rate and blood pressure were, in general, during these activities. The result suggests that supportive relationships buffer the body against stress but that ambivalent friends have the opposite effect. Consistent with that conclusion, the individuals with a greater number of ambivalent friends were more likely to suffer from depression.
If such friends make us unhappy, why do we keep them? In a 2009 study Holt-Lunstad and graduate student Briahna Bigelow Bushman found that people hang onto difficult friendships deliberately—because the relationship has a long history, because the good in the relationship outweighs the bad or because, for whatever reason, they just do not want to give up on the person.
Indeed, you may not need to give up on your frenemies if you know how to manage these relationships to minimize the pain they produce. Whether your friend is worth this effort depends on what he or she means to you. But either way, you can work on keeping your end of the friendship bargain. As Holt-Lunstad says, “Start with controlling your own behavior and being the kind of friend you’d want others to be.”
Coping with Frenemies
You can limit the heartache of trouble-some—but valuable—friendships and family ties using a couple of simple strategies. Psychologist Julianne Holt-Lunstad of Brigham Young University recommends avoiding previously problematic subjects or situations. If your frenemy tends to cancel at the last minute, for example, create backup plans. If talking about politics or religion has led to snide remarks, steer clear of that subject.
In addition, give your frenemy’s motives a positive, or at least neutral, spin. If a friend often calls you at work, you might be tempted to think, “She has no respect for my job or my time.” But perhaps she is the type who needs to share her news right away. “The latter way of thinking is not as personal,” explains psychologist Karen Fin­german of Purdue University. “That’s the kind of social cognition that contributes to better ­relationships.”