Tech VIPs, family take to Web with sorrow, anger over Swartz

The suicide of 26-year-old computer programmer and Internet activist Aaron Swartz has inspired expressions of sorrow and anger from the tech community throughout the day today.

World Wide Web creator Sir Tim Berners-Lee wrote a poem in honor of Swartz, which he posted to a forum on the W3C's Web site (he also tweeted an abridged version):

---

Aaron is dead.

Wanderers in this crazy world,
we have lost a mentor, a wise elder.

Hackers for right, we are one down,
we have lost one of our own.

Nurtures, careers, listeners, feeders,
parents all,
we have lost a child.

Let us all weep.

---

Author and blogger Cory Doctorow posted a tribute on Boing Boing, saying, in part:

Aaron had an unbeatable combination of political insight, technical skill, and intelligence about people and issues. I think he could have revolutionized American (and worldwide) politics. His legacy may still yet do so.

Creative Commons founder Lawrence Lessig published an angry blog post that discussed the legal actions that were being taken against Swartz by the U.S. government in regard to Swartz's alleged theft of millions of documents from MIT and the Jstor database. The post, titled "Prosecutor as Bully," says that "the question this government needs to answer is why it was so necessary that Aaron Swartz be labeled a 'felon.'" It begins on a note of grief:

(Some will say this is not the time. I disagree. This is the time when every mixed emotion needs to find voice.)

Since his arrest in January, 2011, I have known more about the events that began this spiral than I have wanted to know. Aaron consulted me as a friend and lawyer. He shared with me what went down and why, and I worked with him to get help. When my obligations to Harvard created a conflict that made it impossible for me to continue as a lawyer, I continued as a friend. Not a good enough friend, no doubt, but nothing was going to draw that friendship into doubt.

The billions of snippets of sadness and bewilderment spinning across the Net confirm who this amazing boy was to all of us...

And this afternoon, Swartz's family, and his partner, Taren Stinebricker-Kaufmann, released their official statement about Swartz's passing, announcing a Web site they're setting up as a repository of stories and memories about him, and saying that the behavior of MIT and the U.S. District Attorney's Office for the District of Massachusetts played a role in Swartz's death:

Official Statement from the Family and Partner of Aaron Swartz:

Our beloved brother, son, friend, and partner Aaron Swartz hanged himself on Friday in his Brooklyn apartment. We are in shock, and have not yet come to terms with his passing.

Aaron's insatiable curiosity, creativity, and brilliance; his reflexive empathy and capacity for selfless, boundless love; his refusal to accept injustice as inevitable--these gifts made the world, and our lives, far brighter. We're grateful for our time with him, to those who loved him and stood with him, and to all of those who continue his work for a better world.

Aaron's commitment to social justice was profound, and defined his life. He was instrumental to the defeat of an Internet censorship bill; he fought for a more democratic, open, and accountable political system; and he helped to create, build, and preserve a dizzying range of scholarly projects that extended the scope and accessibility of human knowledge. He used his prodigious skills as a programmer and technologist not to enrich himself but to make the Internet and the world a fairer, better place. His deeply humane writing touched minds and hearts across generations and continents. He earned the friendship of thousands and the respect and support of millions more.

Aaron's death is not simply a personal tragedy. It is the product of a criminal justice system rife with intimidation and prosecutorial overreach. Decisions made by officials in the Massachusetts U.S. Attorney's office and at MIT contributed to his death. The US Attorney's office pursued an exceptionally harsh array of charges, carrying potentially over 30 years in prison, to punish an alleged crime that had no victims. Meanwhile, unlike JSTOR, MIT refused to stand up for Aaron and its own community's most cherished principles.

Today, we grieve for the extraordinary and irreplaceable man that we have lost.

Aaron's funeral will be held on Tuesday, January 15 at Central Avenue Synagogue, 874 Central Avenue, Highland Park, Illinois 60035. Further details, including the specific time, will be posted at http://rememberaaronsw.com, along with announcements about memorial services to be held in other cities in coming weeks.

Remembrances of Aaron, as well as donations in his memory, can be submitted at http://rememberaaronsw.com

Among other things, Swartz co-authored the "RSS 1.0" specification of RSS, was arguably a co-founder of Reddit, and was the founder of the nonprofit group Demand Progress, which was active in the anti-SOPA battle. He was a crusader for what he saw as the freedom of information.

Police had arrested Swartz in July 2011 for allegedly stealing 4 million documents from the Massachusetts Institute of Technology and Jstor, an archive of scientific journals and academic papers. The authorities claimed he broke into a restricted-access computer wiring closet at MIT and accessed that network without authorization.

If convicted, Swartz faced a maximum of $4 million in fines and more than 50 years in prison after the government increased the number of felony counts against Swartz to 13 from 4.

News of Swartz's suicide came only days after Jstor announced this week that it would make "more than 4.5 million articles" publicly available for free.

As noted by AllThingsD, in 2011 Carmen Ortiz, U.S. attorney for the District of Massachusetts, said in regard to the case, "Stealing is stealing, whether you use a computer command or a crowbar, and whether you take documents, data, or dollars."

CNET has contacted Ortiz's office and MIT for comment, and we'll update this post when we hear back.

As many of today's outpourings noted, Swartz had struggled with bouts of depression.

CNET's Charles Cooper contributed to this report.

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Pictures: Civil War Shipwreck Revealed by Sonar

Photograph by Jesse Cancelmo

A fishing net, likely only decades old, drapes over machinery that once connected the Hatteras' pistons to its paddle wheels, said Delgado.

From archived documents, the NOAA archaeologist learned that Blake, the ship's commander, surrendered as his ship was sinking. "It was listing to port, [or the left]," Delgado said. The Alabama took the wounded and the rest of the crew and put them in irons.

The officers were allowed to keep their swords and wander the deck as long as they promised not to lead an uprising against the Alabama's crew, he added.

From there, the Alabama dropped off their captives in Jamaica, leaving them to make their own way back to the U.S.

Delgado wants to dig even further into the crew of the Hatteras. He'd like see if members of the public recognize any of the names on his list of crew members and can give him background on the men.

"That's why I do archaeology," he said.

(Read about other Civil War battlefields in National Geographic magazine.)

Published January 11, 2013

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Poisoned Lottery Winner's Kin Were Suspicious

Urooj Khan had just brought home his $425,000 lottery check when he unexpectedly died the following day. Now, certain members of Khan's family are speaking publicly about the mystery -- and his nephew told ABC News they knew something was not right.

"He was a healthy guy, you know?" said the nephew, Minhaj Khan. "He worked so hard. He was always going about his business and, the thing is: After he won the lottery and the next day later he passes away -- it's awkward. It raises some eyebrows."

The medical examiner initially ruled Urooj Khan, 46, an immigrant from India who owned dry-cleaning businesses in Chicago, died July 20, 2012, of natural causes. But after a family member demanded more tests, authorities in November found a lethal amount of cyanide in his blood, turning the case into a homicide investigation.

"When we found out there was cyanide in his blood after the extensive toxicology reports, we had to believe that ... somebody had to kill him," Minhaj Khan said. "It had to happen, because where can you get cyanide?"

In Photos: Biggest Lotto Jackpot Winners

Authorities could be one step closer to learning what happened to Urooj Khan. A judge Friday approved an order to exhume his body at Rosehill Cemetery in Chicago as early as Thursday to perform further tests.

Lottery Winner Murdered: Widow Questioned By Police Watch Video

Moments after the court hearing, Urooj Khan's sister, Meraj Khan, remembered her brother as the kind of person who would've shared his jackpot with anyone. Speaking at the Cook County Courthouse, she hoped the exhumation would help the investigation.

"It's very hard because I wanted my brother to rest in peace, but then we have to have justice served," she said, according to ABC News station WLS in Chicago. "So if that's what it takes for him to bring justice and peace, then that's what needs to be done."

Khan reportedly did not have a will. With the investigation moving forward, his family is waging a legal fight against his widow, Shabana Ansari, 32, over more than $1 million, including Urooj Khan's lottery winnings, as well as his business and real estate holdings.

Khan's brother filed a petition Wednesday to a judge asking Citibank to release information about Khan's assets to "ultimately ensure" that [Khan's] minor daughter from a prior marriage "receives her proper share."

Ansari may have tried to cash the jackpot check after Khan's death, according to court documents, which also showed Urooj Khan's family is questioning if the couple was ever even legally married.

Ansari, Urooj Khan's second wife, who still works at the couple's dry cleaning business, has insisted they were married legally.

She has told reporters the night before her husband died, she cooked a traditional Indian meal for him and their family, including Khan's daughter and Ansari's father. Not feeling well, Khan retired early, Ansari told the Chicago Sun-Times, falling asleep in a chair, waking up in agony, then collapsing in the middle of the night. She said she called 911.

"It has been an incredibly hard time," she told ABC News earlier this week. "We went from being the happiest the day we got the check. It was the best sleep I've had. And then the next day, everything was gone.

"I am cooperating with the investigation," Ansari told ABC News. "I want the truth to come out."

Ansari has not been named a suspect, but her attorney, Steven Kozicki, said investigators did question her for more than four hours.

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Today on New Scientist: 11 January 2013

Largest structure challenges Einstein's smooth cosmos

One-twentieth the diameter of the observable universe, a group of galaxies dents the cherished idea that the cosmos is uniform at large scales

Straitjacket drug halts herpes virus's escape stunt

Herpes infections recur as the virus is adept at evading our defences, but a new drug that suppresses enzymes exploited by the virus seems effective

Zoologger: Mouse eats scorpions and howls at the moon

Super-aggressive grasshopper mice are not put off by the deadly venom of the scorpions they feast on - in fact, nothing much seems to scare them

Sand tsunami pictured striking Australian coast

The spectacular wall of sand and dust appears to block out the sun like a giant wave

Astrophile: Zombie stars feed on Earth-like exoplanets

We can now learn what planets around other stars are made of - by looking at the atmospheres of white dwarfs that have swallowed up their worlds

Life will find a way, even in the midst of a hurricane

Not for the faint-hearted: to sample the microbiome of a hurricane, fly a jetliner through it

Physics not biology may be key to beating cancer

Billions of dollars spent on cancer research have yielded no great breakthrough yet. There are other ways to attack the problem, says physicist Paul Davies

Feedback: Return of nominative determinism

The last nominative determinism stories, salads of gizzards and his chestnuts, Australian graduates in outer space, and more

A comeback for virtual reality? Inside the Oculus Rift

The Oculus Rift promises an immersive gaming experience like no other. Niall Firth gets his head in the game and gives it a try

Is the US facing Flu-maggedon?

The US flu season has come early this winter, leaving many hospitals overwhelmed. But is the situation really any worse than usual?

Your body's insights into life and cosmos

The Universe Within by Neil Shubin tells stories from your body about our species, planet and universe. PLUS: a cautionary tale of inspirational scientists

Hands on with Leap Motion's gestural interface

The makers of the ultra-precise gestural interface talk big about killing off the mouse. But it looks like more than just bluster

Personal assistant for your emails streamlines your life

GmailValet aims to use crowdsourcing to give everyone a personal assistant to help deal with their emails - it could cost as little as $2 a day

DNA 'identichip' gives a detailed picture of a suspect

A new microchip-based DNA tester can identify multiple traits of an individual at a time, even where their DNA is scarce

Most fundamental clock ever could redefine kilogram

Physicists have created the first clock with a tick that depends on the hyper-regular frequency of matter itself

Nanomachine mimics nature's protein factory

An artificial ribosome that assembles proteins and peptides could make it much easier to manufacture antibiotics and exotic new materials

Muscle mimic pulls electricity from wet surface

A plastic film that repeatedly curls up and flips over when wet could power devices in remote areas or sensors embedded in sweaty clothing

Read More..

Central African rivals agree unity government

LIBREVILLE: Central African Republic rebel groups on Friday signed a ceasefire deal with President Francois Bozize who agreed to set up a government of national unity and call new elections.

The accord was announced after three days of talks in the Gabon capital between the government and Seleka rebels who launched an offensive on December 10.

The rebels swept aside the impoverished country's army, but stopped just short of the capital Bangui.

The government and rebels signed a ceasefire accord. The two sides and Central African Republic's political opposition also signed two political accords allowing for the appointment of a prime minister from the opposition and setting out other power-sharing details, according to the United Nations.

The talks were organized by the Economic Community of Central African States (ECCAS) which had sent troops to the troubled country as Bozize faced mounting pressure.

Chad's President Idriss Deby, current ECCAS head, said the opposition and Bozize should start work on the transitional government "from tomorrow".

Under the accord, Bozize will be allowed to finish his mandate which ends in 2016 but he cannot replace the new prime minister during the transition period. Bozize has said he will not stand for a new term.

The agreement also calls for the withdrawal of "all foreign military forces" except those sent by the ECCAS countries. Seleka made this demand specifically to secure the withdrawal of about 200 South African troops sent in December.

The UN Security Council welcomed the signature of the ceasefire, in a statement, which "emphasized the necessity of an expeditious implementation of these agreements and called on all parties to implement them in good faith."

The 15-nation council "urged all parties to allow safe and unhindered access to peoples in need of humanitarian assistance as quickly as possible" and for all civilians held by armed groups to be released.

The violence in the country of some five million has affected more than 300,000 children, with child soldiers recruited and some girls forced to act as sex slaves, according to UN agencies.

The United Nations withdrew non-essential staff and the dependents of all workers in December as rebels neared Bangui.

The UN humanitarian department, OCHA, has voiced serious concern about the plight of civilians amid reports of widespread looting and violence.

The UN's World Food Programme, which has suspended its operations in the country, says hundreds of tonnes of food have been stolen from warehouses across the country.

Central African Republic has been notoriously unstable since its independence from France in 1960.

Bozize took power in a coup in 2003 and has since won two elections.

The rebels accused Bozize of failing to uphold earlier peace deals and had called for him to face war crimes charges at the International Criminal Court.

They also said he planned to modify the constitution to allow him to seek a third term in 2016.

Up to 500 soldiers from Gabon, Democratic Republic of Congo, Chad and Cameroon were sent after troubles in 2008. These troops have begun to pull out of the country.

Nearly 600 French troops are stationed in Bangui, officially to ensure the safety of the estimated 1,200 French nationals in the country.

- AFP/al

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The 2013 TVs of CES are bigger and smarter, but what about the picture?

I expect great things out of the Panasonic ZT60 plasma.

(Credit:
Sarah Tew/CNET)

Will flat-panel TV picture quality get even better in 2013?

I'm guessing "Yes" in the case of the Best of CES nominee Panasonic TC-PZT60 and the re-engineered Samsung UNF8500, very likely the two best-performing TVs of 2013 under $10,000.

But those two are hardly the TV hardware poster children of the 2013 Consumer Electronics Show, where all the headlines touted expensive 4K and OLED sets as well as new gadgetry of questionable usefulness. Finger-gesture control, anyone?

I got a chance to see both the Panasonic and the Samsung plasmas in extended private viewing sessions and suffice it to say, I think both will be able to surpass the mind-bogglingly good Panasonic TC-PVT50 of 2012 at doing what TVs are supposed to do best: make beautiful pictures. I can't wait to review them, nor to test a few other TVs that stood out from a picture quality perspective.

Other TVs that piqued my videophile interest

• Panasonic's entire plasma lineup Based on what I saw at the show, last year's reviews and this year's pricing so far, I wouldn't be surprised if the 2013 Best TVs list at CNET looked as top-heavy with Panasonic plasmas as the 2012 list. Each of the company's 2013 plasma series models, with the exception of the lowest-end X60 perhaps, should be among the best-performing in its price class.
  
• Sony KDL-55W900A The successor to our favorite edge-lit LED TV of 2012, the W900A keeps the company's excellent local-dimming scheme but is unfortunately only available in one size: 55 inches.


• Vizio M series Meanwhile our second-favorite edge-lit LED of 2012 has a whole litter of descendants in various sizes, and all of them do local dimming too. The company is proud of its home-grown dimming, and from what I saw on the 2012 M3D0KD series, the M should be a solid performer. It's also noteworthy that select sizes in the very affordable E series will be the first to do dimming from a "direct LED" configuration.


• Samsung UNF8000 series The biggest TV company is pushing its revamped Smart TV suite to the world, but to me its engineers talked up the fact that this flagship finally put real local dimming back into its highest-end LEDs. Both the F8000 and the F7500 can dim the letterbox bars, which leads to big improvements in perceived contrast for ultra-widescreen movies, but only the F8000 gets dimming across the whole screen. From what I saw of an early sample it looked great, and color was also exceedingly accurate.


• Samsung UN85S9 The winner of the TV category for Best of
  CES got there partly with unique style and buzz-worthy 4K resolution, but what put it atop other 4K sets I saw was the inclusion of local dimming from a full-array LED backlight. It's Samsung's first so-equipped TV since the excellent UN55B8500, and my bet for the best-performing 4K TV of 2013. I just hope it doesn't fall over and crush me during the review.


• Sharp Purios The company's first shipping 4K TV will also be the first to receive THX's 4K display certification -- not a guarantee that it'll be a good performer, but still a positive sign. I saw an encouraging demo where the Purios' image processing, dubbed ICC (integrated cognitive creation), seemingly revealed a bit more depth and detail than a comparison model. I also liked the company's new "Moth eye" screen finish, which straddles the line between matte and glossy and in demo form did a great job suppressing reflections. I was told the finish might not make it onto the shipping Purios, but I hope it does.


• LG Hecto laser projector At $10,000 the Hecto has the distinction of being the cheapest 100-inch-or-larger TV shown at CES 2013, trumping the 110-inch
  LEDs by a few hundred thousand dollars. Essentially a deconstructed rear-projection TV, this short-throw laser projector includes its own screen and even has speakers. It's the only product of its kind from a major maker, and I'm excited to see how it competes against similarly-priced 80-inch
  LED TVs.


• LG LA8600 Even LG's best TVs last year had disappointing performance, but the company's engineers promised me they've done better this year. I assume LG's best non-4K 2013 LED, the LA8600, will showcase those improvements.


• LG 55PM9700 After more than 10 years of doing what I do, I'm more excited to review LG's OLED TV than I've ever been to review any product. Ever. Will its color-filter WRGB technology affect the jaw-dropping contrast and color response I expect from OLED? What about off-angle, color accuracy, even passive 3D? I hope to know soon how our third Best of CES nominee fares.

It's gonna be tough to find an OLED TV in stores.

Uh, what about 4K and OLED?
In our preview we called out both of these buzz-grabbing trends as the stars of CES, but it's important to remember that showstopping display technology usually takes years to go mainstream. You'll be hard-pressed to find 4K TVs anywhere on store shelves in 2013, and OLED will be as rare as a Tesla Roadster. The TVs with both, introduced by Sony and Panasonic, were prototypes that are still years away.

TVs with 4K, or Ultra High Definition (UHD) resolution, were front and center in nearly every major maker's booth, and their huge screens and slow-moving, short-looping demo material often looked very good (although often worse than I expected). No pricing was announced for any of the major makers' new 4K sets, however, and product managers I pressed on the question were universally more tight-lipped than usual -- not a good sign.

If Samsung's 85-inch 4K TV costs less than $20K, I'm a monkey's uncle.

Sony mentioned "a cost that is right around that of a premium HDTV" for its smaller XBR-X900 sizes, and I'm guessing that means $5,000 for the 55-incher. While LG's smaller 4K models might cost a bit less than that, I don't think you'll be able to buy a non-Chinese 4K TV for less than $4K this year. I'll be interested to test new sets from Chinese makers like Hisense (its 4K TVs go down to 50 inches) and TCL, but I'm not expecting them to match the picture quality of the established brands.

And then there are OLED TVs, which LG says will finally be shipping in March for $12,000. Even if you have that kind of cash I'm guessing it will be nearly impossible to lay your hands on one -- initial quantities will be extremely limited. The only other TV maker close to production is Samsung, which says "this year" for its KN55F9500. But the company still hasn't released a final design, and I'm still skeptical the TV will ship.

Whizbang doodads, newfangled thingamabobs, miscellaneous frippery
No CES TV wrap-up would be complete without passing mention of all the extra bullet points TV makers will pack onto specification sheets that have nothing to do with the core mission of making great pictures. I'll try to get it all into one paragraph.

The fire hose: Samsung TVs now have more than 2,800 apps.

Samsung, the king of featuritis, has a new Smart TV suite that can control your cable box as well as recommend upcoming shows and consolidate searches of on-demand video sources (just not Amazon). Sony is pushing NFC pairing, a second-screen app, and DirecTV-friendliness. LG also touts NFC, along with improved voice control and a better motion remote. Panasonic wants to entice you with an optional pen accessory for marking up documents onscreen (huh?), voice control, a touch-pad controller, and a pop-up camera on some models. Vizio has M-Go, a studio-sanctioned streaming app, as well as a new streaming-3D service and HTML5 support in higher-end sets. Everybody has dual-core processors, built-in Wi-Fi, and tons of apps that you'll never use. But at least they all have Netflix.

In the preview I wistfully asked for a dumb TV with all the picture quality enhancements of a flagship model for a bit less money. None was announced. Maybe next year.

A look at the exciting new technology of Sony's 4K OLED TV

Read More..

Pictures: Civil War Shipwreck Revealed by Sonar

Photograph by Jesse Cancelmo

A fishing net, likely only decades old, drapes over machinery that once connected the Hatteras' pistons to its paddle wheels, said Delgado.

From archived documents, the NOAA archaeologist learned that Blake, the ship's commander, surrendered as his ship was sinking. "It was listing to port, [or the left]," Delgado said. The Alabama took the wounded and the rest of the crew and put them in irons.

The officers were allowed to keep their swords and wander the deck as long as they promised not to lead an uprising against the Alabama's crew, he added.

From there, the Alabama dropped off their captives in Jamaica, leaving them to make their own way back to the U.S.

Delgado wants to dig even further into the crew of the Hatteras. He'd like see if members of the public recognize any of the names on his list of crew members and can give him background on the men.

"That's why I do archaeology," he said.

(Read about other Civil War battlefields in National Geographic magazine.)

Published January 11, 2013

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CDC: Flu Outbreak Could Be Waning

The flu season appears to be waning in some parts of the country, but that doesn't mean it won't make a comeback in the next few weeks, according to the Centers for Disease Control and Prevention.

Five fewer states reported high flu activity levels in the first week of January than the 29 that reported high activity levels in the last week of December, according to the CDC's weekly flu report. This week, 24 states reported high illness levels, 16 reported moderate levels, five reported low levels and one reported minimal levels, suggesting that the flu season peaked in the last week of December.

"It may be decreasing in some areas, but that's hard to predict," CDC Director Dr. Thomas Frieden said in a Friday morning teleconference. "Trends only in the next week or two will show whether we have in fact crossed the peak."

The flu season usually peaks in February or March, not December, said Dr. Jon Abramson, who specializes in pediatric infectious diseases at Wake Forest Baptist Health in North Carolina. He said the season started early with a dominant H3N2 strain, which was last seen a decade ago, in 2002-03. That year, the flu season also ended early.

Click here to see how this flu season stacks up against other years.

Cheryl Evans/The Arizona Republic/AP Photo

Increasing Flu Cases: Best Measures to Ensure Your Family's Health Watch Video

Because of the holiday season, Frieden said the data may have been skewed.

For instance, Connecticut appeared to be having a lighter flu season than other northeastern states at the end of December, but the state said it could have been a result of college winter break. College student health centers account for a large percentage of flu reports in Connecticut, but they've been closed since the fall semester ended, said William Gerrish, a spokesman for the state's department of public health.

The flu season arrived about a month early this year in parts of the South and the East, but it may only just be starting to take hold of states in the West, Frieden said. California is still showing "minimal" flu on the CDC's map, but that doesn't mean it will stay that way.

Click here to read about how flu has little to do with cold weather.

"It's not surprising. Influenza ebbs and flows during the flu season," Frieden said. "The only thing predictable about the flu is that it is unpredictable."

Dr. William Schaffner, chair of preventive medicine at Vanderbilt University Medical Center in Nashville, Tenn., said he was expecting California's seeming good luck with the flu to be over this week.

"Flu is fickle, we say," Schaffner said. "Influenza can be spotty. It can be more severe in one community than another for reasons incompletely understood."

Early CDC estimates indicate that this year's flu vaccine is 62 percent effective, meaning people who have been vaccinated are 62 percent less likely to need to see a doctor for flu treatment, Frieden said.

Although the shot has been generally believed to be more effective for children than adults, there's not enough data this year to draw conclusions yet.

"The flu vaccine is far from perfect, but it's still by far the best tool we have to prevent flu," Frieden said, adding that most of the 130 million vaccine doses have already been administered. "We're hearing of shortages of the vaccine, so if you haven't been vaccinated and want to be, it's better late than never."

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Muscle mimic pulls electricity from wet surface

Electricity has been squeezed from a damp surface for the first time, thanks to a polymer film that curls up and moves – a bit like an artificial muscle – when exposed to moisture. The film could be used to run small, wearable devices on nothing but sweat, or in remote locations where conventional electricity sources aren't available.

When a dry polymer absorbs water, its molecular structure changes. This can, in principle, be converted into larger-scale movement, and in turn electricity. But previous attempts at creating a material powered by a moisture gradient – the difference in chemical potential energy between a wet region and a dry region - failed to produce a useful level of force.

These unsuccessful tries used a polymer called polypyrrole. Now Robert Langer and colleagues at the Massachusetts Institute of Technology have turned to the material again, embedding chains of it within another material, polyol-borate. This more complex arrangement mimics structures found in muscles as well as in plant tissues that bend in response to changes in humidity.

Flipping film

The result looks like an ordinary piece of thin black plastic, but when placed on a wet surface, something extraordinary happens. As the material absorbs water, its end curls away from the surface and the film becomes unstable, so it flips over. The ends have now dried out, so they are ready to absorb more water, and the whole process repeats itself. This continuous flipping motion lets the film travel across a suitably moist surface unaided.

Langer found that a 0.03-millimetre-thick strip, weighing roughly 25 milligrams, could curl up and lift a load 380 times its mass to a height of 2 millimetres. It was also able to move sideways when carrying a load about 10 times its mass.

To extract energy from this effect, Langer's team added a layer of piezoelectric material – one which produces electricity when squeezed. When this enhanced film, weighing about 100 milligrams, flipped over, it generated an output of 5.6 nanowatts – enough to power a microchip in sleep mode.

Electricity from sweat

Though the output is small, it is proof that electricity can be extracted from a water gradient. "To the extent of our knowledge, we are the first to utilise a water gradient, without a pressure gradient, to generate electricity," says Langer.

Large-scale energy harvesting is unlikely as the size of the device needed would be impractical, but it could be used to power small devices such as environmental monitoring systems in remote locations. "It will be interesting for applications where the amount of energy needed may be low but where access to energy may be difficult," says Peter Fratzl at the Max-Planck Institute of Colloids and Interfaces in Potsdam, Germany, who was not involved in the work.

Another application, Langer suggests, would be to place the film inside the clothing of joggers or athletes. The evaporation of sweat could generate enough electricity to power sensors monitoring blood pressure and heart rate.

Journal reference: Science, DOI 10.1126/science.1230262

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Python clings to Qantas wing on two-hour flight

SYDNEY: It was not quite a "Snakes on a Plane" scenario, but passengers on a Qantas jet watched in amazement as a three-metre (nine feet) python clung to the outside of their aircraft during a flight.

The Australian carrier said the flight from the Queensland city of Cairns to Port Moresby, capital of the Pacific island nation of Papua New Guinea, took off early Thursday morning with the unintended passenger tucked into its wing.

"The snake was seen by passengers once (the plane) reached cruising altitude," a Qantas spokesman told AFP.

"It was still on the aircraft when it arrived in Port Moresby but it had died by that stage."

Once they spotted it on the wing, passengers watched as the reptile engaged in a life-and-death struggle to maintain its grip on the plane despite the winds and chilly altitude temperatures for the two-hour journey.

Passenger Robert Weber told Fairfax Media Friday that while people at the front of the plane were unaware of the python, those at the back were "all totally focused on the snake and how it might have got onto the aircraft".

Unlike the 2006 "Snakes on a Plane" movie starring Samuel L. Jackson, this reptile did not affect the flight.

"There was no panic. At no time did anyone stop to consider that there might be others on board," Weber said.

He added that the snake had been nestled neatly at first, but once the wind caught the end of its tail, it was "pulling him straight out" and from then on it became a hopeless "life-and-death struggle".

"I felt quite sad for it, really," he said.

An expert said the snake was probably a scrub python, Australia's longest snake and one common in northern Queensland.

Qantas said it had never heard of anything similar happening before, adding that there was no way the reptile could have accessed the cabin.

- AFP/ck

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