5 hurt in 3 gun show shootings

An injured person is taken from the North Carolina State Fairgrounds after being wounded in a gun accident on Saturday.

STORY HIGHLIGHTS

• NEW: A man shoots business partner with a gun he bought at an Ohio show, police say


• A shotgun goes off as its owner unfastens its case at a N.C. gun show, wounding 3


• 1 man shoots himself with his semi-automatic in Indiana, police say


• All three shootings are deemed accidental by authorities

(CNN) -- At least five people -- three in North Carolina, one in Indiana and one in Ohio -- were injured after weapons went off at gun shows Saturday, officials said, at a time when there's been renewed discussion about private gun sales at such shows.

The most casualties came at the Dixie Gun and Knife Show in Raleigh, where attendees bolted -- with at least one woman wiping out in the frenetic scene -- when gunfire rang out around 1 p.m., as seen on video captured by CNN affiliate WRAL.

Police later explained that a a 36-year-old man from Wilmington, North Carolina, was unfastening the case of his 12-gauge shotgun on a table near the show entrance when it accidentally discharged. The man planned to sell the shotgun at the show.

The bird shot ended up injuring three people. One was a sheriff's deputy, who suffered a slight injury to his hand and was treated and released at a local hospital before returning immediately to work, said Joel Keith, chief of police of the North Carolina State Fair.

A 54-year-old woman from Benson, North Carolina, was being treated a wound to her right torso at a local hospital, and a 50-year-old man from Durham, North Carolina, was treated for an injured left hand, Keith told reporters.

"I want to emphasize that this is an accident," Keith said.

That said, Wake County sheriff's investigators and the local prosecutor will determine whether to file charges against the gun's owner, authorities said.

Sheriff Donnie Harrison said he was unsure whether it was legal to bring a loaded gun on state fairgrounds. However, when the state fair is held in October, it is illegal to bring a loaded gun to the fairground because of the large crowds, authorities said.

"This is state property. That's something we're looking into," Harrison told reporters. "It's early right now."

The shooting prompted police to ban any private gun sales -- in which visitors bring their firearms to sell at the gun show -- for the remainder of the two-day show, which concludes Sunday, Keith said. He added there wouldn't be any private gun sales on fairgrounds for the indefinite future.

The gun show was closed after the shooting and will reopen Sunday. At that point, show vendors can continue to sell firearms, which are already secured inside the show, Keith said.

"If we thought if it was a problem or a hazard, we wouldn't have this show," Keith said about private gun sales at the show. "I'm sure there isn't anybody who hates this more than the guy who owned this weapon."

Man shoots business partner with semi-automatic handgun

A person is in stable condition at a northern Ohio hospital after being shot by his business partner at a gun show run by Conrad and Dowdell Productions, said Medina police Chief Patrick Berarducci.

The original owner of the Taurus semi-automatic 9 mm handgun used in the shooting brought the firearm into the show fully loaded. This is despite the policy of searches to make sure all guns are not loaded and rendered safe before others can handle them.

The man who bought the gun told police that he took it out, then accidentally fired it, said Berarducci. A single bullet ended up going into the arm and thigh of this man's business partner.

Authorities don't know who brought the loaded firearm into the gun show and sold it, added the police chief. They'll file a request with the federal ATF to track this person down.

The victim, meanwhile, is in good spirits with non-life-threatening injuries, according to Berarducci.

And in Indianapolis, a man walking out of the Indy 1500 Gun and Knife Show shot himself in the hand as he was loading his .45-caliber semi-automatic firearm, Indiana State Police said in a statement.

The 54-year-old Indianapolis man was sent to Wishard Hospital for treatment after being "slightly" injured.

"The investigation determined the shooting to be accidental, and no charges will be filed," police said.

Shootings occur as gun debate rages

Reforming private gun sales -- at shows or anywhere else -- is among the changes that President Barack Obama is now seeking by requiring background checks.

The president has called for action in the wake of last month's shooting at a school in Newtown, Connecticut, which left 27 people -- 20 of them children age 7 or younger -- dead. Gun control activists have likewise pushed for changes, while gun rights advocates have said restrictions on gun sales are unnecessary and in defiance of their Second Amendment rights.

Currently, federal law requires background checks on gun sales by federally licensed firearms dealers, who are often among the vendors at gun shows.

Saturday's incidents occurred on 'Gun Appreciation Day," an event led by a gun rights group that urged Americans to "go to your local gun store, gun range or gun show with your Constitution, American flags and your 'Hands off my Guns' sign to send a loud and clear message."

Sen. Charles Schumer, a New York Democrat, last Sunday issued a statement predicting this event would drive up sales of things like "assault-style rifles," which have already "skyrocketed" in the wake of the Newtown mass shooting.

Jabari Richards, a gun enthusiast, told WRAL at the Raleigh, North Carolina, show that he thought some reforms were wise.

"I think there should be background checks for everybody," Richards said, "because then you know they ... are capable of having a gun."

But another man at the Raleigh show said it was useless for Washington to step in.

"The gun laws that they have on the books aren't enforced, don't do any good," Al Galbraith said.

CNN's Stefan Simons and Maggie Schneider contributed to this report.

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Failed assassination attempt in Bulgaria - caught on tape

January 19, 2013 12:29 PM

In a failed assassination attempt on the leader of Bulgaria's ethnic Turkish party, Ahmed Dogan, a man is seen jumping out of the audience and onto the stage where Dogan is speaking. He then points the gun at Dogan's head and the gun reportedly misfires. The attacker is then tackled and beaten by security guards.

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Algeria Hostage Crisis Over, One American Dead

After the Algerian military's final assault on terrorists holding hostages at a gas complex, the four-day hostage crisis is over, but apparently with additional loss of life among the foreign hostages.

One American, Fred Buttaccio of Texas, has been confirmed dead by the U.S. State Department. Two more U.S. hostages remain unaccounted for, with growing concern among U.S. officials that they did not survive.

But another American, Mark Cobb of Corpus Christi, Texas is now confirmed as safe. Sources close to his family say Cobb, who is a senior manager of the facility, is safe and reportedly sent a text message " I'm alive."

Inside Algerian Hostage Crisis, One American Dead Watch Video

American Hostages Escape From Algeria Terrorists Watch Video

In a statement, President Obama said, "Today, the thoughts and prayers of the American people are with the families of all those who were killed and injured in the terrorist attack in Algeria. The blame for this tragedy rests with the terrorists who carried it out, and the United States condemns their actions in the strongest possible terms. ... This attack is another reminder of the threat posed by al Qaeda and other violent extremist groups in North Africa."

According to Algerian state media, 32 militants are dead and a total of 23 hostages perished during the four-day siege of the In Amenas facility in the Sahara. The Algerian Interior Ministry also says 107 foreign nationals who worked at the facility for BP and other firms were rescued or escaped from the al Qaeda-linked terrorists who took over the BP joint venture facility on Wednesday.

The Japanese government says it fears "very grave" news, with multiple casualties among the 10 Japanese citizens working at the In Amenas gas plant.

Five British nationals and one U.K. resident are either deceased or unaccounted for in the country, according to British Foreign Minister William Hague. Hague also said that the Algerians have reported that they are still trying to clear boobytraps from the site.

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NASA planet-hunter is injured and resting

Lisa Grossman, physical sciences reporter

(Image: NASA/Kepler mission/Wendy Stenzel)

NASA's planet-hunting Kepler telescope has put its search for alien Earths on hold while it rests a stressed reaction wheel.

The injured wheel normally helps to control the telescope's orientation, keeping it pointed continuously at the same patch of sky. Kepler stares at the thousands of stars in its field of view to watch for the telltale blinks that occur when a planet crosses in front of its star. It has found nearly 3000 potential planets outside our solar system since its launch in 2009, transforming the field of exoplanet research and raising hopes of someday finding alien life.

When it launched, Kepler had four reaction wheels: three to control its motion along each axis, and one spare. But last July, one wheel stopped turning. If the spacecraft loses a second wheel, the mission is over.

So when another wheel started showing signs of elevated friction on 7 January, the team decided to play it safe. After rotating the spacecraft failed to fix the problem, NASA announced yesterday that they're placing Kepler in safe mode for 10 days to give the wheel a chance to recover.

The hope is that the lubricating oil that helps the wheel's ball bearings run smoothly around a track will redistribute itself during the rest period.

The telescope can't take any science data while in safe mode. But if the wheel recovers on its own, Kepler's extended mission will run until 2016, leaving it plenty of time to make up for the lost days.

"Kepler is a statistical mission," says Charlie Sobeck, Kepler's deputy project manager at NASA's Ames Research Centre in Mountain View, California. "In the long run, as long as we make the observations, it doesn't matter a lot when we make the observations."

Despite the high stakes, the team doesn't seem too worried.

"Each wheel has its own personality, and this particular wheel has been something of a free spirit," Sobeck says. "It's had elevated torques throughout the mission. This one is typical to what we've seen in the past, and if we had four good wheels we probably wouldn't have taken any action."

"I prefer to picture the spacecraft lounging at the shore of the cosmic ocean sipping a Mai Tai so that she'll be refreshed and rejuvenated for more discoveries," wrote Kepler co-investigator Natalie Batalha in an email.

The team will check up on the wheel on 27 January and return to doing science as soon as possible.

There are two exoplanet missions currently being considered for after Kepler is finished, says Doug Hudgins at NASA Headquarters in Washington, DC. One, TESS (Terrestrial Exoplanet Survey Satellite), would scan the entire sky for planets transiting the stars nearest to the sun. The other, FINESSE (Fast Infrared Exoplanet Spectroscopy Survey Explorer), would take spectra of planets as they passed in front of their stars as a way to probe their atmospheres.

The missions are being evaluated now, and NASA will probably select one this spring, Hudgins says. The winner will launch in 2017.

If Kepler goes down with its reaction wheel, that won't affect which mission wins, he adds. "That's a straight-up competition based on the merits of the two concept study reports."

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Tennis: Serena, Murray suck it up to reach sweet 16

MELBOURNE: Serena Williams and Victoria Azarenka came through their first uncomfortable moments and Andy Murray was also tested before reaching the Australian Open's last 16 on Saturday.

Williams, eyeing a calendar-year Grand Slam, was broken for the first time in the tournament by Japanese number one Ayumi Morita, before recovering from 0-3 down in the second set to win 6-1, 6-3.

Defending champion Azarenka screamed at herself and thrashed her racquet before overcoming an unexpectedly stiff challenge by America's Jamie Hampton, who bravely played through severe back pain.

Argentina's Juan Martin Del Potro, seeded six, became the tournament's biggest casualty when the 2009 US Open champion slumped to a five-set defeat to unseeded Frenchman Jeremy Chardy.

Jo-Wilfried Tsonga and Richard Gasquet also went through, and with Gilles Simon playing Gael Monfils later France was assured of having four men in the fourth round, equalling their best performance at the tournament.

In the most competitive day so far, Murray extended his Grand Slam winning streak to 10 matches but not before a thorough workout from hitting partner Berankis, and he let his frustrations show during the 6-3, 6-4, 7-5 win.

The world number three trailed by a break of serve in the second set and appeared agitated at various stages, hitting his racquet on the court and yelling at his courtside box.

Murray served for the match at 5-4 in the third set but Berankis, the world number 110, broke back. But the 22-year-old dropped his next service game and Murray made no mistake in his second attempt at closing the victory.

The Olympic and US Open champion will next face the winner of the all-French affair between Monfils and Simon.

"I was struggling," Murray said. "He (Berankis) was making me feel pretty frustrated. We know each other well and we have practised together. He was making me feel pretty uncomfortable out there."

Williams unleashed her fastest ever serve, a 207 kilometres per hour (128 mph) bullet which equalled a speed clocked in round two against Garbine Muguruza, as she subdued the challenge of Morita.

"I feel today was actually a really good match for me," said Williams, a five-time winner at Melbourne Park and holder of 15 Grand Slam titles.

"I was involved in a lot of longer points, something I definitely wanted. I feel good. I hope I can keep this level up and go higher."

Azarenka admitted she needed to improve "everything" to successfully defend her title after surviving a scare against injured American Hampton, who winced as she played and was close to tears from the pain.

"It was definitely tough," said Azarenka, who won 6-4, 4-6, 6-2 and next plays Elena Vesnina. She is on course to meet Caroline Wozniacki in the quarter-finals.

"It's always good to know you can battle through not playing well, not feeling great."

World number seven Del Potro won four titles last year and dropped just 13 games in the first two rounds, but he found Chardy in inspired form and couldn't recover after going two sets down, finally succumbing in five.

Italy's Andreas Seppi ousted 12th seed Marin Cilic, but Tsonga found it easier with a straight-sets win over Blaz Kavcic, who was on an IV drip just two days ago after playing a five-hour marathon in intense heat.

In the prime-time evening match, four-time champion Roger Federer was due to play Australian upstart Bernard Tomic as he seeks to extend his record number of Grand Slam titles to 18.

-AFP/ac

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Manti Te'o: 'I wasn't faking it'

By Greg Botelho and Lateef Mungin, CNN

updated 1:52 AM EST, Sat January 19, 2013

STORY HIGHLIGHTS

• Manti Te'o talks to ESPN about his alleged girlfriend hoax


• "I wasn't faking it," he says in an off -camera interview


• Te'o rose to national prominence by leading the Fighting Irish to an undefeated regular season

What are your thoughts? Share with us on iReport.

(CNN) -- Manti Te'o -- one of the best defenders this season in college football -- defended himself in an ESPN interview Friday night, saying there was no way he was part of a hoax involving a deceased girlfriend.

"I wasn't faking it," he told ESPN's Jeremy Schaap in an off -camera interview highlighted on the network. "I wasn't part of this."

Notre Dame star Manti Te'o

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For the past two days, the former Notre Dame linebacker has been the subject of ridicule after reports surfaced that the girlfriend he'd gushed about and said died this fall of leukemia never existed.

Te'o rose to national prominence by leading the Fighting Irish to an undefeated regular season, amassing double-digit tackle games and becoming the face of one of the best defenses in the nation.

As he and his team excelled, Te'o told interviewers in September and October that his grandmother and girlfriend -- whom he described as a 22-year-old Stanford University student -- had died within hours of each other.

The twin losses inspired him to honor them with sterling play on the field, Te'o said. He led his team to a 20-3 routing of Michigan State after he heard the news.

"I miss 'em, but I know that I'll see them again one day," he told ESPN.

He was second in the Heisman race and led his team to the championship game, losing to Alabama.

The fairy tale story ended on Wednesday when sports website Deadspin published a piece dismissing as a hoax the existence of Te'o's girlfriend and suggesting he was complicit.

"When (people) hear the facts, they'll know," Te'o told ESPN. "They'll know that there is no way that I could be part of this."

CNN's Phil Gast and Amanda Watts contributed to this report.

Part of complete coverage on

Manti Te'o hoax

updated 11:28 AM EST, Fri January 18, 2013

This may be the strangest twist in a tale overflowing with strangeness. Manti Te'o's deceased girlfriend tweeted late Wednesday night.

updated 9:46 AM EST, Fri January 18, 2013

Te'o is now a meme -- posting pictures of yourself with your arm around an imaginary girlfriend. They call it "Te'oing."

updated 10:44 AM EST, Fri January 18, 2013

Manti Te'o's Twitter bio reads: "Life is a storm.. You will bask in the sunlight one moment, be shattered on the rocks the next. What makes you a man is what you do when that storm comes." The storm has arrived.

updated 11:04 AM EST, Fri January 18, 2013

Oh, the stories we storytellers tell. Like the story of brave Manti Te'o and his doomed girlfriend. We love a good story. We love spinning a good yarn.

updated 9:46 AM EST, Fri January 18, 2013

Was Manti Te'o a hapless victim or a duplicitous co-conspirator?

updated 9:52 AM EST, Fri January 18, 2013

I wouldn't normally pay much attention to a sports star, even a Fighting Irish hero.

updated 7:36 AM EST, Thu January 17, 2013

Here are some of the recent events in the bizarre story of Manti Te'o and a dead girlfriend who apparently never existed:

updated 8:50 AM EST, Thu January 17, 2013

After word broke of a hoax about the death of star Manti Te'o's "girlfriend," it didn't take long for "Te'o" to become the top-trending term on Twitter.

updated 9:37 PM EST, Wed January 16, 2013

Deadspin.com Editor Timothy Burke says the story about Notre Dame linebacker Manti Te'o's girlfriend is a hoax.

updated 11:13 AM EST, Thu January 17, 2013

Notre Dame linebacker Manti Te'o says he's the victim of a hoax. Anderson Cooper talks to the reporter who broke the news.

updated 7:52 AM EST, Thu January 17, 2013

As the big game with No. 10 Michigan State approached, Notre Dame linebacker Manti Te'o had a heavy heart after he learned his girlfriend had lost her fight with leukemia.

updated 10:17 AM EST, Thu January 17, 2013

A dog tapping away at a computer keyboard turns to another dog and says, "On the Internet, nobody knows you're a dog."

updated 4:40 AM EST, Thu January 17, 2013

Notre Dame athletic director Jack Swarbrick compared the alleged hoax about a "girlfriend" that ensnared linebacker Manti Te'o with the documentary "Catfish."

updated 11:22 PM EST, Wed January 16, 2013

Notre Dame linebacker Manti Te'o said he was the victim of a "sick joke" that had him and legions of fans believing in a "girlfriend" who may never have existed.

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T'eo to hoax doubters: "I wasn't part of this"

Updated 12:15 AM ET

SOUTH BEND, Ind. Manti Te'o gave an interview to ESPN in which he denied any involvement in fabricating an online relationship with a woman he considered to be his girlfriend.

"I wasn't faking it," he told ESPN Friday night. "I wasn't part of this."

13 Photos

Manti Te'o

Te'o also said that he did not make up anything to help his Heisman Trophy candidacy.

"When (people) hear the facts, they'll know," he said. "They'll know that there is no way that I could be part of this."

Te'o spoke at the IMG Training Academy in Bradenton, Fla., where he is preparing for the NFL draft. There were no cameras at the 2?-hour interview, which was recorded.

Earlier, Notre Dame athletic director Jack Swarbrick said during the taping of his weekly radio show that Te'o has to explain exactly how he was duped into an online relationship with a fictitious woman whose "death" was then faked by perpetrators of the scheme.

Skeptics have questioned the versions of events laid out by Te'o and Notre Dame, wondering why Te'o never said his relationship was with someone online and why he waited almost three weeks to tell the school about being duped.

Play Video

Will scandal affect Manti Te'o's NFL future?

According to Notre Dame, Te'o received a call on Dec. 6 from the girl he had only been in contact with by telephone and online, and who he thought had died in September. After telling his family what happened while he was home in Hawaii for Christmas, he informed Notre Dame coaches on Dec. 26.

Notre Dame said it hired investigators to look into Te'o's claims and their findings showed he was the victim of an elaborate hoax.

Play Video

Notre Dame rallies to Manti Te'o's side

Te'o released a statement on Wednesday, soon after Deadspin.com broke news of the scam with a lengthy story, saying he had been humiliated and hurt by the "sick joke." But he has laid low since.

ESPN officials posted a photo on Twitter late Friday night of reporter Jeremy Schapp with Te'o and his attorney. Te'o has been working out at the IMG Academy in Bradenton, Fla., as he prepares for the NFL combine and draft.

Play Video

Notre Dame athletic director: Faith in Te'o hasn't shaken "one iota"

Swarbrick said earlier in the day that he believed Te'o would ultimately speak publicly.

"We are certainly encouraging it to happen," he said. "We think it's important and we'd like to see it happen sooner rather than later."

He said thatmant before the Deadspin story, Te'o and his family had planned to go public with the story Monday.

"Sometimes the best laid plans don't quite work, and this was an example of that. Because the family lost the opportunity in some ways to control the story," he said. "It is in the Te'o family's court. We are very much encouraging them."

Former NFL coach Tony Dungy, who mentored Michael Vick when he returned to the NFL after doing prison time, had similar advice.

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2013 BCS National Championship

"I don't know the whole case but I always advise people to face up to it and just talk to people and say what happened," Dungy said while attending the NCAA convention in Dallas on Friday. "The truth is the best liberator, so that's what I would do. And he's going to get questioned a lot about it."

Te'o led a lightly regarded Fighting Irish team to a 12-0 regular season and the BCS title game, where they were routed 42-14 by Alabama and Te'o played poorly.

Dungy said Te'o could face the toughest questions from NFL teams.

"If I was still coaching and we're thinking about taking this guy in the first round, you want to know not exactly what happened but what is going on with this young man and is it going to be a deterrent to him surviving in the NFL and is it going to stop him from being a star," Dungy said. "So just tell the truth about what happened and this is why, I think, that's the best thing."

Deadspin reported that friends and relatives of Ronaiah Tuiasosopo, a 22-year-old who lives in California, believe he created Kekua. The website also reported Te'o and Tuiasosopo knew each other — which has led to questions about Te'o's involvement in the hoax.

Swarbrick understands why there are questions.

"They have every right to say that," Swarbrick said "Now I have some more information than they have. But they have every right to say that. ... I just ask those people to apply the same skepticism to everything about this. I have no doubt the perpetrators have a story they will yet spin about what went on here. I hope skepticism also greets that when they're articulating what that is."

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Armstrong Tearful Over Telling Kids Truth

Lance Armstrong, 41, began to cry today as he described finding out his son Luke, 13, was publicly defending him from accusations that he doped during his cycling career.

Armstrong said that he knew, at that moment, that he would have to publicly admit to taking performance-enhancing drugs and having oxygen-boosting blood transfusions when competing in the Tour de France. He made those admissions to Oprah Winfrey in a two-part interview airing Thursday and tonight.

"When this all really started, I saw my son defending me, and saying, 'That's not true. What you're saying about my dad? That's not true,'" Armstrong said, tearing up during the second installment of his interview tonight. "And it almost goes to this question of, 'Why now?'

"That's when I knew I had to talk," Armstrong said. "He never asked me. He never said, 'Dad, is this true?' He trusted me."

He told Winfrey that he sat down with his children over the holidays to come clean about his drug use.

"I said, 'Listen, there's been a lot of questions about your dad, about my career and whether I doped or did not dope,'" he said he told them. "'I always denied that. I've always been ruthless and defiant about that, which is why you defended me, which makes it even sicker' I said, 'I want you to know that it's true.'"

He added that his mother was "a wreck" over the scandal.

Armstrong said that the lowest point in his fall from grace and the top of the cycling world came when his cancer charity, Livestrong, asked him to consider stepping down.

George Burns/Harpo Studios, Inc.

Lance Armstrong-Winfrey Interview: How Honest Was He? Watch Video

Lance Armstrong-Winfrey Interview: Doping Confession Watch Video

After the U.S. Anti-Doping Agency alleged in October that Armstrong doped throughout his reign as Tour de France champion, Armstrong said, his major sponsors -- including Nike, Anheuser Busch and Trek -- called one by one to end their endorsement contracts with him.

"Everybody out," he said. "Still not the most humbling moment."

Then came the call from Livestrong, the charity he founded at age 25 when he was diagnosed with testicular cancer.

"The story was getting out of control, which was my worst nightmare," he said. "I had this place in my mind that they would all leave. The one I didn't think would leave was the foundation.

"That was most humbling moment," he said.

Armstrong first stepped down as chairman of the board for the charity before being asked to end his association with the charity entirely. Livestrong is now run independently of Armstrong.

"I don't think it was 'We need you to step down,' but, 'We need you to consider stepping down for yourself,'" he said, recounting the call. "I had to think about that a lot. None of my kids, none of my friends have said, 'You're out,' and the foundation was like my sixth child. To make that decision, to step aside, that was big."

In Thursday's interview installment, the seven-time winner of the Tour de France admitted publicly for the first time that he doped throughout his career, confirming after months of angry denials the findings of the U.S. Anti-Doping Agency, which stripped him of his titles in October.

He told Winfrey that he was taking the opportunity to confess to everything he had done wrong, including for years angrily denying claims that he had doped.

READ MORE: Armstrong Admits to Doping

WATCH: Armstrong's Many Denials Caught on Tape

READ MORE: 10 Scandalous Public Confessions

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Wind turbines supercharged with superconductors

WIND turbines may soon get a supercharge. Turbines wound with superconducting wire instead of regular copper could turn today's 2 to 3-megawatt generators into 10-megawatt powerhouses, say teams in Europe and the US that are racing to produce the machines.

At heart, a wind turbine is simple - a series of wire coils attached to the rotor blade spin in the presence of strong magnetic fields, provided by stationary magnets. This generates a current, but the resistance in copper wire limits the amount of current that can flow through the coils. Making the coils from a resistance-free superconductor would cut down on weight and boost power generation.

Using superconductors will not be easy, though, partly due to the ultra-low temperatures they require. Developing a coil that can be cooled while simultaneously rotating with the turbine blades is a big challenge. A research project dubbed Suprapower, funded by the European Union, kicked off in December to address this problem.

Holger Neumann at the Karlsruhe Institute of Technology in Germany and other members of the Suprapower consortium are betting on a new "high temperature" superconductor, magnesium diboride, which works at 20 kelvin. "It's light, easily made into wires and is really cheap compared with the old niobium-titanium superconductors, which needed cooling way down to 4 kelvin," Neumann says. That temperature difference might not sound much but it means, crucially, that cooling the magnesium diboride superconductor requires just one-seventh of the power.

The team will also have to build a casing, called a cryostat, in which the superconducting coil will be kept chilled by gaseous helium. This is tricky as its supporting structure will act as a "heat bridge" to the warmer world outside. Neumann thinks they have cracked the problem with a novel arrangement of an outer vacuum vessel and insulating inner layers of plastic and titanium.

But however good their technology, they have to contend with an unusual property of superconductors - when the wires sweep through a magnetic field, their ability to generate current is reduced. That means more coil turns would be needed to make up for the current loss, which would negate some of the weight savings and make the turbines more expensive to construct.

"Magnetic flux lines interfere with the wires' ability to transport electricity, lowering its performance," says Venkat Selvamanickam at the University of Houston, Texas, where the US government is funding work via its Advanced Research Projects Agency - Energy. Selvamanickam's team thinks they have found a way to solve this problem - adding 5-nanometre-wide particles of barium zirconate to the wire. The team found that this "pins" the magnetic flux lines in place as the wires sweep through the field, preventing the formation of swirling magnetic vortices that reduce current flow. So far they have eliminated 65 per cent of this current-limiting problem.

The US team claims to be within a few years of building their own 10-megawatt wind turbine, and says that their techniques could make superconducting wires attractive for distributing electricity as well as generation.

"If we can demonstrate this superconducting-wire technology in a wind turbine, we think it's more likely that it will make its way into the power cables of the electricity grid," says Selvamanickam.

Merrily spins as laser looks on

Lasers could slash wind-turbine power outages, say engineers at Chonbuk National University in South Korea. If the bolts securing turbine blades to a rotor begin to loosen, or blade mass is lost due to a lightning strike, a blade can strike the turbine tower and fall off. But monitoring for when a blade starts to go out of alignment is expensive as it involves peppering each blade with strain sensors.

A cheaper answer is to place a laser on the tower and instead measure the reflection time from every blade as it passes by. This way, deviation of all the blades is measured using just one low-cost sensor (Smart Materials and Structures, doi.org/j62).

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Cycling: Livestrong "disappointed" by Armstrong's deception

WASHINGTON: Livestrong, the cancer charity founded by disgraced cyclist Lance Armstrong, said on Thursday it was "disappointed" that he had deceived the organization and many others about doping.

"We at the Livestrong Foundation are disappointed by the news that Lance Armstrong misled people during and after his cycling career, including us," it said after the broadcast of Armstrong's interview with Oprah Winfrey.

Armstrong, 41, used the interview to come clean for the first time about his use of performance enhancing drugs to win seven consecutive Tour de France races, after more than a decade of strident denials.

Prior to recording the interview on Monday in his hometown of Austin, Texas, Armstrong personally went to Livestrong headquarters to apologize to its staff -- and in the interview, he wore its iconic yellow fund-raising wristband.

"We accepted his apology in order to move on and chart a strong, independent course," the foundation said in its statement, received 40 minutes after the conclusion of part one of the broadcast, which will continue on Friday.

"Even in the wake of our disappointment, we also express our gratitude to Lance as a (cancer) survivor for the drive, devotion and spirit he brought to serving cancer patients and the entire cancer community," it said.

"Lance is no longer on the foundation's board, but he is our founder and we will always be grateful to him for creating and helping to build a foundation that has served millions struggling with cancer."

It added: "Our success has never been based on one person. It's based on the patients and survivors we serve every day who approach a cancer diagnosis with hope, courage and perseverance."

Armstrong founded Livestrong in 1997 after he underwent chemotherapy to overcome testicular cancer that had spread to his brain and other parts of his body.

He stepped down first as its chairman, then from its board of directors last year as the US Anti-Doping Agency, in a damning 1,000-page report, put him at the center of the biggest doping conspiracy in the annals of cycling.

Livestrong says it has served more than 2.5 million people affected by cancer and raised more than US$500 million since its founding to support cancer survivors. It does not contribute directly to cancer research.

- AFP/xq

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