Today on New Scientist: 5 February 2013







Engineering light: Pull an image from nowhere

A new generation of lenses could bring us better lighting, anti-forgery technology and novel movie projectors



Baby boomers' health worse than their parents

Americans who were born in the wake of the second world war have poorer health than the previous generation at the same age



New 17-million-digit monster is largest known prime

A distributed computing project called GIMPS has found a record-breaking prime number, the first for four years



Cellular signals used to make national rainfall map

The slight weakening of microwave signals caused by reflections off raindrops can be exploited to keep tabs on precipitation



NASA spy telescopes won't be looking at Earth

A Mars orbiter and an exoplanet photographer are among proposals being presented today for how to use two second-hand spy satellites that NASA's been given



China gets the blame for media hacking spree

The big US newspapers and Twitter all revealed last week that they were hacked - and many were quick to blame China. But where's the proof?



Nobel-winning US energy secretary steps down

Steven Chu laid the groundwork for government-backed renewable energy projects - his successor must make a better case for them



Sleep and dreaming: Where do our minds go at night?

We are beginning to understand how our brains shape our dreams, and why they contain such an eerie mixture of the familiar and the bizarre



Beating heart of a quantum time machine exposed

This super-accurate timekeeper is an optical atomic clock and its tick is governed by a single ion of the element strontium



A life spent fighting fair about the roots of violence

Despite the fierce conflicts experienced living among anthropologists, science steals the show in Napoleon Chagnon's autobiography Noble Savages



Challenge unscientific thinking, whatever its source

Science may lean to the left, but that's no reason to give progressives who reject it a "free pass"



Need an organ? Just print some stem cells in 3D

Printing blobs of human embryonic stem cells could allow us to grow organs without scaffolds



Ice-age art hints at birth of modern mind

An exhibition of ice-age art at London's British Museum shows astonishing and enigmatic creativity





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Passion in US lower house immigration debate






WASHINGTON: US lawmakers debated plans on Tuesday to build a pathway to citizenship for millions of immigrants who remade their lives in America but found themselves at the heart of a fierce debate.

President Barack Obama and a group of Republican and Democratic senators have submitted plans for reform, but as the House of Representatives took up the issue, there were signs the bipartisan facade is coming under strain.

While from the Democratic side of the aisle, a rising Hispanic-American political star made an impassioned plea to fix a broken system, more senior Republicans warned against pushing too fast for change.

"Immigration is more than a political issue. It's who we are," said Julian Castro, the charismatic young mayor of San Antonio, Texas who had a star turn last year on the stage of the Democratic National Convention.

"Immigrants have made ours the greatest country in the world," he told a packed House Judiciary Committee hearing. "Doing nothing is not an option."

But Bob Goodlatte, chairman of the committee, warned against a "rush to judgment" -- despite concerns among his Republican colleagues that they have lost the support of a generation of Hispanic and Asian voters.

"I think we can all agree that our nation's immigration system is in desperate need of repair and it is not working as efficiently and fairly as it should be," he told the first of several hearings on the issue.

Goodlatte warned his panel "needs to take the time to learn from the past so our efforts to reform our immigration laws do not repeat the same mistakes."

The burst of activity on Capitol Hill marks the best chance in years to craft legislation to tighten border security, improve employment verification and bring some 11 million illegal immigrants out of limbo.

A 2007 effort spearheaded by then-president George W. Bush failed.

Obama and top Republicans are for once in agreement that political and demographic trends have suddenly shifted to offer the best chance for serious reform in a generation.

November's election saw Obama re-elected with 70 percent backing from Hispanic American voters -- many of whom have friends or relatives seeking papers.

It shook Republicans into realizing that their tough stance on immigration had driven Hispanics away from the party, and party luminaries like Senator Marco Rubio have come out strongly in favor of immigration reform.

But differences remain, particularly in the contentious issue of how to accommodate the millions who entered the country without permission, or who came in legally but overstayed their visas.

The issue bubbled over in the hearing room when about eight protesters stood up with fists raised, and chanted "undocumented and unafraid!" for about 30 seconds before walking out.

Castro said a pathway to citizenship, similar to the one proposed by the bipartisan group of senators last month, was crucial in order to bring 11 million undocumented immigrants "out of the shadows and into the full light of the American dream."

Republican Goodlatte pushed back, seeking to carve a possible compromise option short of full citizenship for those who entered illegally or stayed beyond their visa.

"Are there options that we should consider between the extremes of mass deportation and a pathway to citizenship for those not lawfully present in the United States?" Goodlatte asked.

Democratic congresswoman Zoe Lofgren, a former immigration lawyer from California, conceded the system was dysfunctional, but that "partial legalization, as some are suggesting, is a dangerous path."

She argued that merely providing undocumented workers with legal status but no way to work towards full citizenship could create a "permanent underclass," while kicking the undocumented out en masse would trigger economic chaos.

With up to 90 percent of the estimated two million migrant farm workers in the country illegally, "you could do e-verify and find out they're not properly here and American agriculture would collapse."

Obama addressed the immigration issue Tuesday as well, hosting meetings with more than two dozen progressive leaders and business executives.

Steve Case, co-founder of America Online, said he was encouraged by the discussion at the White House.

"The president and his team listened to numerous proposals, outlined many of their own and expressed a desire to build a bipartisan consensus regarding comprehensive immigration reform," Case said.

-AFP/ac



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Apple's ownership of 'iPhone' name in Brazil in peril



Apple could soon lose its rights to use the iPhone name in Brazil as part of a decision expected from the local patent and trademark office next week.


Citing an unnamed source, both Reuters and Folha de S.Paulo today say The Brazilian Institute of Intellectual Property plans to award an exclusive iPhone name trademark to Brazil-based electronics company Gradiente.


Gradiente filed for the iPhone naming rights in the country years before Apple's device came to be. However the company didn't put out its own iPhone-branded product until last December when it began selling a line of touchscreen smartphones running Google's
Android.


In a release about the new products, Gradiente said it had secured the legal rights to the name through 2018.


An Apple spokesman declined to comment on the reports.


Apple famously wrestled the rights to the iPhone name in the U.S. from Cisco Systems in early 2007, just months before the product's release. Cisco sued Apple for trademark infringement immediately after the iPhone was unveiled at the annual Macworld conference in January that same year. In its complaint, Cisco said Apple had approached the company over the name a number of times, even using a shell company in an attempt to acquire the moniker. The two ended up settling in February 2007.


Internationally the story has been a bit more interesting, including a fight in China over the rights to the "iPad" trademark with a company called Proview. That dispute, which threatened sales of the popular
tablet in the country, was settled last July for $60 million. A similar result is expected in Brazil if the patent office sides with Gradiente, with a report earlier today quoting a company official saying he was "open to a dialogue" of such a deal.


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Life Found Deep Under Antarctic Ice For First Time?


For the first time, scientists believe they have collected life-forms from deep under the Antarctic ice.

Last week, a team found and collected microbes in a lake hidden under more than a half-mile of ice. (Related: "Race Is On to Find Life Under Antarctic Ice.")

Among other things, the discovery may shed light on what lies under the icy moons of Jupiter and Saturn.

The newfound life-forms have little connection to life on the earth's surface and many apparently survive by "eating rocks," team member Brent Christner said in an interview from the U.S. McMurdo Station, after spending several weeks working at a remote field site at Lake Whillans.

That may explain how life on other celestial objects—such as on the moons of Jupiter and Saturn—survive in the absence of available carbon.

"The conditions faced by organisms in Lake Whillans are quite parallel to what we think it would be like on those icy moons," Christner said.

"What we found tells us a lot about extreme life on Earth," and how similar life beyond Earth might survive.

Making a Living in Ice

A 50-member U.S. team broke through to the 20-square-mile (50-square-kilometer) subglacial lake on January 28, and had two days of 24-hour sunlight to bring up samples before the borehole began to close. A day of reaming the hole was followed by two more days of sample collection.

The scientists are now returning with a four-day haul of lake water, lake bottom sediments, and hundreds of dishes of living organisms that are being cultured for intensive study in the United States.

An early task will be to make sure the newfound microbes were not introduced while drilling through the ice into the lake, which involved a hot-water drilling technique designed to greatly reduce or eliminate any contamination that might come from other kerosene-based drilling technology, Christner said.

Christner said that a commonly used dye was added to the water to illuminate the DNA of the microscopic organisms, and a substantial green glow told scientists that microbes were indeed present. Many of the organisms are likely chemolithotrophs, which rely on inorganic compounds of iron, sulfur, and other elements for nourishment.

Montana State's John Priscu, chief biologist of the Whillans Ice Stream Subglacial Access Research Drilling (WISSARD) program, said lab work at the drill site determined that microbial cells were present—and that they were alive. (Take an Antarctic quiz.)

"I believe it is safe to say that subglacial lake beneath the Whillans Ice Stream supports a microbial assemblage that is growing within this dark and cold habitat" of 31 degrees Fahrenheit (-0.5 Celsius), he wrote in an email.

DNA sequencing in the U.S. "will tell us who they are and, together with other experiments, tell us how they make a living."

Hidden Lakes

The U.S. team is one of three digging into what is now known to be a vast system of lakes and streams deep below the surface of Antarctica. (See "Chain of Cascading Lakes Discovered Under Antarctica.")

A British team attempting to drill into much deeper Lake Ellsworth had to return home in December because of equipment failure, but a Russian team is also at work now retrieving a core of water from Lake Vostok.

With much fanfare, the Lake Vostok core was pulled up last year from more than 2.5 miles (4 kilometers) below the frigid surface. Vostok is much deeper and larger than any other Antarctic lake, and both it and Ellsworth lie under much colder ice and are believed to have less deep subsurface water flowing in and out than does Whillans.

The existence of subglacial lakes and streams in Antarctica is a relatively new discovery, and the size of this wet world under the ice has only been grasped in recent years. (See Antarctic pictures by National Geographic readers.)

Helen Fricker, a glaciologist at the Scripps Institution of Oceanography and a principal investigator of the Whillans team, first described Lake Whillans in 2007.

Using satellite data, she and her colleagues discovered a periodic rising and falling of the ice surface above the Whillans Ice Stream between 2003 and 2006, and concluded that a lake was likely underneath.

The dynamics of Antarctic ice has taken on a much greater significance in the era of global warming, since some 90 percent of Earth's fresh water sits on the continent.

Although the lakes themselves are not affected by warming, how they interact with the region's ice is important to predicting the future behavior of the ice sheets.

For instance, understanding whether the ice is moving more quickly toward the surrounding ocean is a key goal of the WISSARD project, which is part of a larger U.S. National Science Foundation project to understand the ice movements, glaciers, and biology of the ice sheet of West Antarctica.

More Work to Be Done

For Christner, a specialist in Antarctic biology at Louisiana State University, the work has only just begun. (Also see "Pictures: 'Extreme' Antarctic Science Revealed.")

Two labs were brought to the Whillans site by a caravan of trucks from McMurdo: One to perform a quick analysis of the lake water, and the other to examine sediment.

Christner's team is charged with culturing samples in dishes so they can be studied more extensively later. He said some of the microbe species, including bacteria and archaea, may be unique, but many may well be found elsewhere—at great ocean depths and deep underground.


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Sierra's Family Selling Photos to Cover Funeral, Kids













The family of Sarai Sierra, an amateur New York photographer slain while on a trip to Turkey, put her photos up for sale today and quickly sold enough photographs to pay forher funeral, the woman's brother said today.


The photos remain on sale and the profits will now be going to her two young sons, the family said.


Sierra, 33, was found bludgeoned to death near a highway in Istanbul on Saturday. Her iPhone and iPad, the tools she used to share her photos with her thousands of Instagram followers were reportedly missing.


The Staten Island mother of two traveled to Turkey alone on Jan. 7 after a friend had to cancel. It was Sierra's first overseas trip, and she kept in contact with her family the entire time, they said, sharing stories of her journey and posting photos online.



"Sarai's passion for photography and love for capturing the beauty we see in culture, architecture and scenery was her reason for traveling to Istanbul," her brother, David Jimenez, wrote on a website set up to sell his sister's photography.


Among the photos for sale are Istanbul sunsets, and shots of Sierra's beloved New York City.






Courtesy Sarai Sierra's family











New Clues in Death of Missing American Mother Watch Video









Sarai Sierra's Body Found: Missing New York Mom Found in Turkey Watch Video









Body Found in Search for Missing Mother in Turkey Watch Video





By this afternoon, Jimenez put out another message saying, "Hey Instacanvas, Thank you for all the support in purchasing Sarai's pictures. Quick update, all expenses for Sarai's funeral have been paid for! From here on out any picture of hers that you purchase will NOT be going towards her funeral. All funds will be going to her children. Thank you for your support. David"


Sierra had been scheduled to arrive home at Newark Liberty International Airport on Jan. 22. When her husband, Steven Sierra, called the airline, he was told his wife never boarded the flight from Istanbul.


Steven Sierra and Jimenez traveled to Istanbul to aid in the search.


An intense two week search for for Sarai Sierra ended when her battered body was found.


An autopsy was completed Sunday, but results aren't expected for three months. Turkish officials however said Sierra was killed by at least one fatal blow to her head.


A casket holding the Staten Island mother was taken to a Istanbul church Monday where it remains as Sierra's family makes arrangements to bring her home.


Turkish police hope DNA samples from 21 people being questioned in the case will be key to finding the perpetrators, state media reported. A motive is not yet clear.


"They're still investigating so they might think it might be a robbery, but they're not sure," said Betsy Jimenez, Sierra's mother, said Monday.


The family also faces the heartbreaking task of telling Sierra's two sons, ages 11 and 9, that their mother is dead.



The boys have been under the impression that their father has gone to Turkey to bring their mother home - alive.


"It's going to be the hardest thing he's ever going to have to do in his life," said Rep. Michael Grimm, (R-NY) who added that the Staten Island family isn't sure when Steven Sierra will be able to bring his wife's body home.


ABC News' Josh Haskell contributed to this report.



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Ice-age art hints at birth of modern mind



Sumit Paul-Choudhury, editor


don-valley-figurines.jpg

Figurines from the Don river valley (Images: Kirstin Jennings)


The world’s oldest portrait, the world’s first fully carved sculpture, the world's oldest ceramic figure, the world’s earliest puppet - there’s no shortage of superlatives in the new exhibition of art from the ice age at the British Museum in London


But focus too closely on the exhibits’ record-breaking ages alone, and you might miss the broader point: these beautiful objects are the earliest evidence we have of humans who seem to have had minds like ours.






lionman.jpg

Consider, for example, the "lion man" found in 1939 in south-west Germany’s Stadel cave (pictured above). As the name suggests, this statue, standing 30 centimetres tall, harmoniously combines human and leonine features: the head is unmistakeably a lion’s, while the body and lower limbs are more human.


This is clearly the product of artistic creativity rather than a naturalistic drawing from life - suggesting that whoever carved it some 40,000 years ago had the capacity to express their imagination, as well as to replicate what they saw around them.


The temptation to speculate about what symbolic meaning the lion man might have had is, of course, irresistible. It was clearly valuable, taking around 400 hours and enormous skill to carve from a single piece of mammoth ivory.


The exhibition also includes a second, much smaller, feline figure found in another cave nearby, pointing to the idea that such imaginative objects might have cultural significance, perhaps as ritual objects within a shamanic belief system, rather than being isolated art objects.


Given what we know of modern traditions, that would make sense - but there is no hard evidence that anything resembling those traditions existed in Europe during the ice age.


Almost every object on show invites similarly thought-provoking consideration. Thumb-sized figurines from settlements along Russia's Don river (top) seem to present a woman's perception of her own pregnant body in an age before mirrors: no face, bowed head, the shelf of the bosom, the protrusion of the hips and buttock muscles and the swell of the belly. Were they carved by the women themselves, perhaps as protective talismans for themselves or their unborn children? And if so, what are we to make of those that were apparently deliberately destroyed subsequently?


Only a few of the animal models found at the Czech site of Dolní Věstonice are intact. The rest had shattered into thousands of clay fragments when they were heated while still wet. This must also have been deliberate: was the dramatic shattering part of a rite?


A tiny relief of a human figure with upraised arms invites interpretation as a celebrant or worshipper. Was he or she participating in a ceremony to promote social cohesion during tough times - perhaps to the accompaniment of music played on instruments such as the flute displayed nearby, which is precisely carved from a vulture's wing-bone?


Such interpretations deserve a healthy dose of caution, of course. The note accompanying an elegantly carved water bird (perhaps a cormorant) found near the smaller lion man drily reads: "This sculpture may be a spiritual symbol connecting the upper, middle and lower worlds of the cosmos reached by a bird that flies in the sky, moves on land and dives through water. Alternatively, it may be an image of a small meal and a bag of feathers."


In the total absence of documentary evidence, there is no way of telling which is correct: archaeological material might help clarify the utilitarian perspective, but it is far less helpful when it comes to discovering any symbolic value.


In any case, there is very little archaeological evidence on display at the British Museum. Curator Jill Cook says she was keen to avoid exhausting visitors with copious background material about the evolutionary and environmental contexts in which these objects were made.


Humans were capable of complex behaviour long before they reached Europe - as demonstrated by discoveries such as the 100,000-year old "artist's workshop" in South Africa's Blombos cave - but Cook thinks the explosion of art among Europeans 40,000 years ago may reflect changing social needs during the ice age.


When Homo sapiens first arrived in Europe some 45,000 years ago, "the living was initially probably reasonably easy", explains Cook. They would have found temperatures only about 5 °C lower than they are now, she says, and grassy prairies would have been well stocked with bison. As the human population grew, they would have had to find new ways of building, socialising and organising themselves.


“And as it turns desperately cold, around 40,000 years ago, suddenly we have all this art," she says.


That may have reflected the need to communicate and develop ideas - a need pressing enough for people to spend hundreds of hours creating objects that generally seem to have had little quotidian function.


"This is all about planning and preconceiving and organising and collaborating and compromising," suggests Cook, "and that is something art and music helps us do."


The dazzling array of objects on display, spanning tens of thousands of years, anticipate practically every modern artistic tradition. The first portrait, dating back 26,000 years, includes closely modelled details of its female subject's unusual physiognomy, perhaps the result of an injury or illness.


But nearby is an extraordinary figure of similar age whose facial features are utterly abstract, resembling a visor with a double slit in it.


picasso-inspiration.jpg

Another (above) has a body whose angular patterns anticipate Cubism by some 23,000 years: Picasso kept two copies of it in his studio. Elsewhere, there are doll-like models of women with stylised faces, and female forms streamlined into little more than slender, strategically curved lines.


movement.jpg

Representations of animals, too, come in all forms, from incredibly realistic illustrations scratched onto stone or ivory, to elegantly minimal sculptures; there are even carvings designed to create the illusion of movement when viewed from different angles or rotated (above) - a form of prehistoric animation.


The masterpieces in the latter part of the show include - and sometimes combine - both precisely observed, superbly rendered naturalism, and more abstract work that is still beautiful, but much harder to interpret.


tusks.jpg

Carved mammoth tusks


"The brain likes to tease us," says Cook. "We don't just represent things with great realism and naturalism, we like to break things down into patterns. That sparks your imagination, and makes you curious and questioning.


“What’s so spectacular about the modern brain, and the mind that it powers, is that it doesn't just make everything simple, it pushes us to new ideas and new thoughts."


After tens of thousands of years, the objects displayed in this extraordinary exhibition still have the power to do just that.


Ice Age Art: Arrival of the modern mind runs at the British Museum from 7 February 2013



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In mice, gene therapy boosts hope for the deaf






PARIS: Scientists using gene therapy have partially restored hearing and balance in profoundly deaf mice, according to a study published on Monday in the journal Nature Medicine.

The research, still in its early stages and restricted to lab animals, may open up new avenues for tackling Usher syndrome, an inherited form of human deafness that usually goes hand in hand with blindness.

Researchers led by Michelle Hastings at the Rosalind Franklin University of Medicine and Science in Chicago, Illinois, aimed at a gene called USH1C which has been implicated in the "Type 1" form of Usher syndrome.

USH1C controls a protein called harmonin, which plays a vital role in hair cells -- the cells in the cochlea of the inner ear that respond to sound waves and send an electrical signal to the brain.

The team devised a tiny strand of genetic material called an antisense oligonucleotide to "switch off" a faulty version of the gene that produces truncated forms of the protein.

The therapy was injected in newborn mice that had been genetically engineered to have the mutation.

A single injection partially restored their hearing at very low frequencies, and also reduced head tossing, a behaviour caused by impaired balance.

"These effects were sustained for several months, providing evidence that congenital deafness can be effectively overcome by treatment early in development to correct gene expression," the study says.

After the experiment, the mice were dissected, and their cochleas were found to have grown some hair cells.

The success of antisense oligonucleotides adds a further weapon in the quest to overcome deafness.

Last month, doctors at the Massachusetts Eye and Ear and Harvard Medical School reported on a gene drug that transformed cells in the cochlea into hair cells.

In 2012, investigators at the University of California, San Francisco targeted a fix for a faulty version of a gene called VGLUT3. The gene controls a protein that is vital for hair cells to send the signals they pick up.

- AFP/jc



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Canadian penny bites the dust. Is the nickel next?



An obsolete coin for your thoughts: Google.ca paid tribute to the Canadian penny, which was first struck in 1858.



(Credit:
Google)



We Canadians love innovating our money. We're printing plastic banknotes and chucking out useless coins.


Last March I said I wouldn't mourn the passing of the Canadian penny.


And yet today, as the Royal Canadian Mint officially stopped distributing the cent to banks, I have mixed feelings. I saw the Google.ca animated doodle honoring the coin and felt a tad nostalgic.


So I fished out a few pennies from my pockets and considered the brazen image of Queen Elizabeth and the maple leaf.




There's something a little Dickensian in these worn coppers. The oldest on my desk is from 1977. The surface is dull and the queen looks a lot younger.




That coin passed through many hands only to wind up in mine. It's got a real-world history that makes it special.


Electronic money, and e-books for that matter, don't have that historicity, that unique physical existence through time.


While I'm glad to see the penny go, I also feel like I'm losing a tiny link to my fellow human beings, a connection I only really thought of now. Not to mention all those folksy idioms like "the penny drops."


For those who get dewy-eyed over its demise, the mint is offering 20,000 commemorative 50-cent rolls of the last million pennies manufactured.


Meanwhile, 99-cent sales could go out of fashion, since prices for cash sales are being rounded to the nearest nickel. Prices that end in 1 or 2 are rounded down to zero, those ending in 3, 4, 6, or 7 are rounded to 5, and those ending in 8 or 9 are rounded up to 10.


The mint was spending 1.6 cents on every penny it made until production ended last May; axing the coin is expected to save some $11 million. Canada follows New Zealand and Australia in stopping production of the penny.


While the billions of Canadian pennies still in circulation will be legal tender indefinitely, some are calling for the nickel to go too, though there has been some pushback with that idea.


"It shouldn't be as tough as a slog now because the case has been made that life as we know it isn't going to end if we eliminate the lowly penny," NDP member of Parliament Pat Martin was quoted as saying in the National Post.


Life hasn't ended, but I feel for all those penny pinchers out there.


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Space Pictures This Week: A Space Monkey, Printing a Moon Base

Illustration courtesy Foster and Partners/ESA

The European Space Agency (ESA) announced January 31 that it is looking into building a moon base (pictured in an artist's conception) using a technique called 3-D printing.

It probably won't be as easy as whipping out a printer, hooking it to a computer, and pressing "print," but using lunar soils as the basis for actual building blocks could be a possibility.

"Terrestrial 3-D printing technology has produced entire structures," said Laurent Pambaguian, head of the project for ESA, in a statement.

On Earth, 3-D printing, also known as additive manufacturing, produces a three-dimensional object from a digital file. The computer takes cross-sectional slices of the structure to be printed and sends it to the 3-D printer. The printer bonds liquid or powder materials in the shape of each slice, gradually building up the structure. (Watch how future astronauts could print tools in space.)

The ESA and its industrial partners have already manufactured a 1.7 ton (1.5 tonne) honeycombed building block to demonstrate what future construction materials would look like.

Jane J. Lee

Published February 4, 2013

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Boy Safe, Kidnapper Dead as Ala. Standoff Ends













A week-long Alabama standoff in which a retired trucker held a 5-year-old boy hostage in an underground bunker has ended with the kidnapper dead and the child safe, according to law enforcement.


"FBI agents safely recovered the child who's been held hostage for nearly a week," FBI Special Agent Steve Richardson said at a news conference.


The agent said negotiations with the suspect, Richard Lee Dykes, "deteriorated" in the past 24 hours.


"Mr. Dykes was observed holding a gun," Richardson said. "At this point, the FBI agents, fearing the child was in imminent danger, entered the bunker and rescued the child."


The boy, identified only as Ethan, "appears physically unharmed" and is being treated at a hospital, authorities said.


Dykes, 65, is dead, but officials have not yet provided details on how he died.






Joe Songer/AL.com/AP Photo











Alabama Hostage Crisis: Boy Held Captive for 7 Days Watch Video









Hostage Standoff: Drones Fly Over Alabama Bunker Watch Video









Police Officials Thank Hostage Taker for Taking Care of Child Watch Video





"Right now, FBI special agent bomb technicians are in the process of clearing the property for improvised explosive devices," the FBI said in a written statement. "When it is safe to do so, our evidence response teams, paired with state and local crime scene technicians, will process the scene."


PHOTOS: Worst Hostage Situations


Dykes allegedly shot and killed a school bus driver last week and threatened to kill all the children on the bus before taking the boy, one of the students on the bus said.


"He said he was going to kill us, going to kill us all," Tarrica Singletary, 14, told ABC News.


Dykes had been holed up in his underground bunker near Midland City, Ala., with the abducted boy for a week as police tried to negotiate with him through a PVC pipe. Police had used the talks to send the child comfort items, including a red Hot Wheels car, coloring books, cheese crackers, potato chips and medicine.


Dykes was a decorated Vietnam vet who grew up in the area. He lived in Florida until two years ago, the AP reported, and has an adult daughter, but the two lost touch years ago, neighbor Michael Creel said. When he returned to Alabama, neighbors say he once beat a dog with a lead pipe and had threatened to shoot children who set foot on his property.



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