Anonymous: U.S. justice system has 'crossed a line'

A screenshot at 3:35 a.m. ET on January 26, 2013, of the homepage of the United States federal sentencing website after it had been hacked by a group that identified itself as "Anonymous."

STORY HIGHLIGHTS

• U.S. Sentencing Commission website restored


• The FBI is handling the incident as a "criminal investigation"


• Hackers say they have a file of incriminating information ready to launch


• The threat note cited anger over the death of Internet activist Aaron Swartz

(CNN) -- In anger over the recent death of an Internet activist who faced federal charges, hackers claiming to be from the group Anonymous threatened early Saturday to release sensitive information about the U.S. Department of Justice.

They claimed to have one such file on multiple servers ready for immediate release.

The hackers hijacked the website of the U.S. government agency responsible for federal sentencing guidelines, where they posted a message demanding the United States reform its justice system or face incriminating leaks to select news outlets.

The lengthy, eloquently written letter was signed "Anonymous."

Richard McFeely, executive assistant director of the FBI's Criminal, Cyber, Response, and Services Branch, said the bureau was immediately aware of the threat and is "handling it as a criminal investigation."

"We are always concerned when someone illegally accesses another person('s) or government agency's network," he said.

The U.S. Sentencing Commission said its website was brought down "temporarily" before it was restored later Saturday. "The commission's publications, training materials and federal sentencing statistics are again readily accessible to visitors to the site," it said in a statement.

The suicide of Internet activist Aaron Swartz on January 11 triggered the posting of the hackers' message to the web address of the sentencing commission, they said.

His death, which they blamed on the justice system, "crossed a line," the letter said.

How Aaron Swartz helped build the Internet

A YouTube video accompanied the message, and made use of images from Cold War nuclear scenarios and games of strategy. The letter contained nuclear metaphors to refer to chunks of embarrassing information.

The hackers said they have obtained "enough fissile material for multiple warheads," which it would launch against the Justice Department and "its associated executive branches."

It gave the "warheads" the names of U.S. Supreme Court justices.

'Anonymous' threatens Westboro Baptist

Anonymous accused the FBI of infiltrating its ranks and claimed the federal government is applying "highly disproportionate sentencing" to ruin the lives of some of its members.

Swartz, 26, was facing federal computer fraud charges and could have served 35 years in prison. Anonymous said he "was killed," because he "faced an impossible choice."

His family has issued a statement saying that federal charges filed over allegations that he stole millions of online documents contributed to Swartz's decision to take his own life. The files were mostly scholarly papers from the Massachusetts Institute of Technology.

Opinion: Why the Net grieves Aaron Swartz

Swartz's suicide has inspired a flurry of online tributes and mobilized Anonymous, the loosely defined collective of so-called "hacktivists" who oppose attempts to limit Internet freedoms. Both Swartz and Anonymous have been stark proponents of open access to information and open-source programming.

A review of a cached version of the USSC.gov website showed the Anonymous message on its homepage early Saturday.

Anonymous also posted an editable version of the website, inviting users to deface it as they pleased. Multiple pages -- not only the home page -- appeared to allow users to alter them.

The "warhead" names appeared as links, most leading to 404 error messages of pages not found, but some leading to pages of raw programming code.

The hackers said they chose the commission's website because of its influence on the doling out of sentences they consider to be unfair.

CNN's Carol Cratty, Jason Moon, AnneClaire Stapleton contributed to this report

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1 officer killed, 2 wounded near La. casino

Updated 8:50 PM ET

NEW ORLEANS Police on Saturday arrested a man suspected of fatally shooting a police officer and critically wounding two sheriff's deputies after allegedly setting fire to a mobile home in south Louisiana, where an elderly man's body was found.

A Chitimacha tribal officer was pronounced dead at the scene of the shootings in Charenton, while two St. Mary Parish sheriff's deputies were critically wounded and taken to local hospitals, said Louisiana State Police Trooper Stephen Hammons.

This photo provided by the Louisiana State Police shows Wilbert Thibodeaux.

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AP Photo/Louisiana State Police

Hammons said the officers were responding to a report of an armed man walking down a road near the Cypress Bayou Casino when Wilbert Thibodeaux, 48, of Charenton allegedly shot them.

"Thibodeaux fired at the Chitimacha Officer, fatally wounding him," state police said in a news release. "As two St. Mary Deputies, who were in the same car, arrived at the scene Thibodeaux fired multiple shots hitting the deputies. During the encounter, Thibodeaux was shot."

Investigators found the burned remains of a man after extinguishing a fire at a mobile home that Thibodeaux is suspected of setting before the officers confronted him, Hammons said.

Police identified the deceased man in the mobile home as Eddie Lyons, 78, of Charenton. "Detectives suspect Lyons was shot by Thibodeaux before the fire," state police said in a news release.

Thibodeaux was treated at a hospital for a gunshot wound that wasn't considered life-threatening and released, according to Hammons, who said investigators were questioning him Saturday evening. Charges against him are pending.

The state Fire Marshal's office is investigating the fire.

"Today is a difficult day for our partners in St. Mary Parish," Col. Mike Edmonson, the State Police superintendent, said in a statement. "My thoughts and prayers are with the deputies and the officer's families tonight. I know the coming days and weeks will be difficult ones for the men and women of the Chitimacha Police Department and the St. Mary Parish Sheriff's Office. We will assist their agencies in any way we can during these trying times."

The casino is run by the Chitimacha Tribe of Louisiana and is less than a quarter-mile from the scene of the shootings. Hammons said the shootings occurred near but not on tribal land.

"Everybody is just in shock. It's small-town America," said Jacqueline Junca, the tribe's secretary and treasurer.

Police didn't immediately release the names of the officers. Authorities said they will do so at a Monday news conference.

Tribe councilman Toby Darden said the slain officer was married and had two grown children, but he declined to give his name.

"He's a real great guy. Extremely dedicated to his job. Very brave," Darden said.

He was one of seven full-time officers who patrol a 260-acre reservation that has roughly 150 homes, a grocery store, a small school and government offices.

"Everybody knows the officers personally," Darden said. "It's devastating."

Junca said the tribe has around 1,200 members, roughly half of whom live on the reservation.

Access to and from the casino was restricted for roughly 90 minutes as a precautionary measure while police responded to the shooting, said casino spokeswoman Nancy Herrington. Charenton is located about 45 miles southeast of Lafayette.

"We are very much in business and have been," Herrington said later Saturday. "We have events tonight. All of those are taking place."

A spokeswoman for the sheriff's office and a tribal police dispatcher referred questions about the shootings to the State Police.

"We've got a lot of unanswered questions," State Police Capt. Doug Cain said.

One of the injured deputies was taken to a hospital in New Orleans and the other was taken to a Lafayette hospital. Both were listed in critical but stable condition Saturday evening, Hammons said.

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Newtown Families March for Gun Control in DC

Jan 26, 2013 4:59pm

(YURI GRIPAS/AFP/Getty Images)

WASHINGTON, D.C. — Near-freezing temperatures didn’t stop several thousand gun-control activists from bearing their pickets today, carrying signs emblazoned with “Ban Assault Weapons Now” and the names of gun violence victims in a demonstration organized as a response to the mass shooting in Newtown, Conn. last month.

Walking in silence, the demonstrators trudged between Capitol Hill and the Washington Monument over a thin layer of melting snow. They were joined by politicians and some families of the Newtown victims.

March organizer Shannon Watts said the event was for the “families who lost the lights of their lives in Newtown, daughters and sons, wives and mothers, grandchildren, sisters and brothers gone in an unfathomable instant.”

“Let’s stand together and use our voices, use our votes to let legislators know that we won’t stand down until they enact common sense gun control laws that will keep our children out of the line of fire,” she told demonstrators.

Watts founded One Million Moms for Gun Control after the killing of 20 first graders and six adults at the Sandy Hook Elementary School in Newtown in December. In a profile with the New York Times, Watts said her 12-year-old son had suffered panic attacks after learning of last summer’s Aurora, Colo., theater shooting, leaving her at an impasse over how to talk to him about the latest tragedy.

Also among the speakers was a survivor of the 2007 Virginia Tech massacre, Collin Goddard.

“We need to challenge any politician who thinks it’s easier to ask an elementary school teacher to stand up to a gunman with an AR-15 than it is to ask them to stand up to a gun lobbyist with a checkbook,” he said.

The demonstration comes amid a push by progressive lawmakers to enact stricter gun control measures as a response to the trend of recent mass killings, although any hypothetical bill would likely face strong opposition in Congress.

Rep. Chris Van Hollen, D-Md., was among the demonstrators today.

“The idea that people need high-capacity magazines that can fire 30, 50, 100 rounds has no place in a civilized society,” he said. “Between the time we’re gathered here right now and this time of day tomorrow, across America, 282 Americans will have been shot.”

The congressman was quoting statistics compiled by the Brady Campaign to Stop Gun Violence.

INFOGRAPHIC: Guns by the Numbers

Last week President Obama proposed a sweeping overhaul of federal measures regulating gun ownership, including a universal background check system for sales, banning assault weapons,  and curbing the amount of ammunition available in weapon clips.

An ABC News/Washington Post poll released Thursday found 53 percent of Americans viewed Obama’s gun control plan favorably, 41 percent unfavorably. The division was visible today, as a handful of gun-rights advocates also turned out on the National Mall to protest what they believe would be infringements on their Second Amendment liberties.

ABC’s Joanne Fuchs contributed to this report.

SHOWS: Good Morning America World News

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Today on New Scientist: 25 January 2013

Hagfish gulped up in first video of deep-sea seal hunt

Watch the first sighting of a seal's underwater eating habits spotted by a teenager watching a live video feed

World's oldest portrait reveals the ice-age mind

A 26,000-year-old carved ivory head of a woman is not just an archaeological find - a new exhibition in London wants us to see works like this as art

Dung beetles navigate using the Milky Way

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Stress's impact can affect future generations' genes

DNA analysis has yielded the first direct evidence that chemical marks which disable genes in response to stress can be passed on to offspring

Uncharted territory: Where digital maps are leading us

The way we use maps is evolving fast, says Kat Austen, and it will change a great deal more than how we navigate

Feedback: Tales of the stony turd industry

Fossilised faeces in Shitlington, confusing railway notices, organic water, and more

Duolingo gives language learning a jump start

First evidence that Duolingo, a new website that helps you learn a language while translating the web, actually works

Dolphins form life raft to help dying friend

A group of dolphins was caught on camera as they worked together to keep a struggling dolphin above water by forming an impromptu raft

Zoologger: Supercool squirrels go into the deep freeze

Hibernating Arctic ground squirrels drop their body temperatures to -4 °C, and shut their circadian clocks off for the winter

Greek economic crisis has cleared the air

The ongoing collapse of Greece's economy has caused a significant fall in air pollution, which can be detected by satellites

Body armour to scale up by mimicking flexible fish

Armour that is designed like the scales of the dragon fish could keep soldiers protected - while still letting them bend

Astrophile: Split personality tarnishes pulsars' rep

Pulsars were seen as cosmic timekeepers, but the quirky way in which one example shines suggests we can't take their behaviour for granted

Shrinking proton puzzle persists in new measurement

The most precise experiment yet to find the proton's radius confirms that it can appear smaller than our theories predict - is new physics needed?

Tight squeeze forces cells to take their medicine

A short sharp squash in these channels and a cell's membrane pops open - good news when you want to slip a molecule or nanoparticle in there

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Obama, Hollande hold phone talks on Mali offensive

WASHINGTON: US President Barack Obama voiced support Friday for France's military intervention in Mali and vowed to work with French counterpart Francois Hollande to tackle extremism across North Africa.

The two presidents discussed other "shared security concerns," including Algeria, Libya and Syria, during telephone talks, the White House said in a statement.

"The president expressed his support for France's leadership of the international community's efforts to deny terrorists a safe haven in Mali," it added.

In condemning a deadly hostage-taking operation by militants in Algeria last week, the two leaders "affirmed their mutual commitment to countering terrorism more broadly in North Africa," according to the statement.

Preliminary estimates from the Algerian authorities say 37 foreign hostages and 29 kidnappers died in an attack at the In Amenas gas field and in the military operation that followed.

Hollande also thanked Obama for his "significant support" of the effort in Mali, the White House said.

The US Air Force has deployed C-17 cargo planes to carry French troops and equipment to northern Mali, where they are trying to help flush out radical extremist fighters.

The United States also was providing intelligence to France, drawing on its network of satellites and surveillance drones.

Paris has asked Washington to help with refueling its warplanes taking part in the fight against militant fighters in Mali, but Obama's administration has yet to approve the request.

Obama and Hollande also "emphasized the need to rapidly establish" both an African-led military force in Mali and a "political roadmap that will lead to elections and restoration of democratic governance," the White House said.

The pair "condemned last week's terrorist act in Algeria," and "affirmed their mutual commitment to countering terrorism more broadly in North Africa."

Turning to Libya, in the wake of an uprising that toppled dictator Muammar Gaddafi in 2011, the two presidents "noted the importance of sustained assistance to Libya as it works to build effective security sector institutions," the statement added.

Hollande and Obama also spoke about Syria, "expressing their strong concern about the humanitarian crisis affecting not just Syria but also neighboring countries and reiterating their commitment to assisting the Syrian people achieve political transition to a post-Assad Syria," the statement said.

Syria's civil war has already claimed the lives of more than 60,000 people since March 2011, according to the United Nations, which has predicted that the number of Syrian refugees in neighboring countries will double to 1.1 million by June if the conflict does not end.

- AFP/fa

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RNC chief 'intrigued' by proposed electoral change

STORY HIGHLIGHTS

• NEW: A spokesman for the Virginia governor says he does not support the proposal


• GOP state legislatures consider changing how they allocate electoral votes


• The proposed changes would have hurt President Obama in last year's election


• A similar push followed the hotly contested 2000 presidential election

Washington (CNN) -- If at first you don't succeed, try to change the rules.

A proposal under consideration in Virginia's Republican-led state Legislature would change how the commonwealth allocates its 13 electoral votes in the wake of Democratic President Barack Obama's re-election last November.

Obama won the popular vote in the crucial battleground state to claim all 13 electoral votes, even though GOP challenger Mitt Romney beat him in seven of the 11 congressional districts.

Under the proposed alternative system, electoral votes would get divvied up by congressional districts won. In addition, Virginia's two other electoral votes -- one for each U.S. Senate seat -- would go to the candidate who won the most congressional districts.

If the district-based system had been in effect in Virginia last year, Romney would have gotten nine electoral votes to four for Obama.

Jindal urges GOP to stop being 'stupid'

While a subcommittee has advanced the Virginia proposal, skepticism expressed by some GOP state senators raised doubts that it would proceed any further.

Gov. Bob McDonnell, a Republican, does not support the plan, according to his spokesman.

"He believes Virginia's existing system works just fine as it is. He does not believe there is any need for a change," Tucker Martin said in statement.

However, Reince Priebus, newly re-elected chairman of the Republican National Committee, called the idea worth examining.

"I think it is a state issue, but personally I'm pretty intrigued by it," he told reportersFriday.

Opinion: Where the stupidity really lies

The state party chairman in Florida, Lenny Curry, questioned the wisdom of such a move at a time when the party is trying to broaden its support.

"It seems to me we ought to be focused on connecting with voters and bringing them into our party versus trying to change the game," Curry said.

To Sean Trende, the senior elections analyst at RealClearPolitics, the concept doesn't violate democratic principles, but he called it a bad idea.

"Close elections would likely always result in extensive recounts, we could see huge disparities between the popular and electoral vote, and the partisan motive behind it would be transparent," he wrote Friday on the group's website.

Currently, only Nebraska and Maine use a district-based plan for allocating electoral votes.

Their systems differ from the Virginia proposal by awarding the two additional electoral votes to the winner of the popular vote, rather than who won the most districts. Last year, both split their electoral votes between Obama and Romney.

Other GOP-controlled state legislatures reportedly contemplating changes to their electoral vote allocation include Pennsylvania, Ohio and Michigan.

Under the Electoral College system, each state is worth a certain number of electoral votes based on population. Winning the presidency requires a majority of the electoral vote, regardless of who wins the popular vote.

States have the power to decide how their electoral votes get allocated, the National Conference of State Legislatures noted on its website.

It cited a similar push for change after the 2000 election, when Democratic Vice President Al Gore won the national popular vote but lost the electoral vote, and therefore the decision, to Republican George W. Bush.

From 2001 to 2006, bills proposing adoption of the district system were introduced in many states, but failed to pass, according to the NCSL website. Both Maine and Nebraska adopted their district-based systems before 2000.

The issue reflects the regionalization of America's deep partisan divide, with splits in many states between populous urban areas that tend to be more liberal and larger, less populated rural areas that generally are more conservative.

In Virginia, Obama got strong support in two heavily populated northern districts close to Washington as well as a district that includes much of Richmond and Norfolk. Romney won more rural districts in the central, southern and western parts of the state.

Overall in Virginia, Obama got 51% of the total vote -- more than 1.97 million -- compared to Romney's 1.82 million for 47% of the total.

CNN's Mark Preston and Joe Sutton contributed to this report.

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Notre Dame president defends handling of Te'o case

SOUTH BEND, Ind. Top administrators at Notre Dame decided within hours of hearing about the Manti Te'o dead girlfriend hoax that it did not involve a crime and within two days had concluded there was no NCAA violation, according to a letter sent by the university president to board of trustee members on Friday.

The Rev. John Jenkins told trustees that despite "the unrelenting scrutiny of hundreds of journalists and countless others — and repeated attempts by some to create a different impression- no facts relating to the hoax have been at odds with what Manti told us" on Dec. 27-28.

The letter was obtained Friday by The Associated Press from a university official who provided it on condition of anonymity because the private school's internal workings are confidential.

The eight-page document, including a four-page letter from Jenkins and a four-page outline of how Notre Dame handled the hoax, is both a defense and an explanation of the school's actions.

"We did our best to get to the truth in extraordinary circumstances, be good stewards of the interests of the university and its good name and — as we do in all things — to make the well-being of our students one of our very highest priorities," Jenkins concluded in his letter.

Some of the timeline Notre Dame outlined is well known, including that its star linebacker disclosed the scam to his coaches the day after Christmas and it remained unknown to the public until Deadspin.com broke the story on Jan. 16, long after the Fighting Irish lost the BCS championship to Alabama on Jan. 7.

Jenkins wrote that Notre Dame officials talked in the hours after hearing from Te'o on Dec. 26 and agreed there was no indication of a crime or student conduct code violation. Athletic director Jack Swarbrick spoke with Te'o the next day, and on Dec. 28 the school concluded there were no indications of an NCAA rules violation, which could have put Notre Dame's 12-0 regular season in jeopardy.

The school then made moves to find out who was behind the hoax, thereby protecting Te'o and itself.

"For the first couple of days after receiving the news from Manti, there was considerable confusion and we simply did not know what there was to disclose," Jenkins wrote.

13 Photos

Manti Te'o

On Jan. 2, after several days of internal discussion and a week after Te'o's disclosure, Notre Dame retained Stroz Friedberg, a New York computer forensics firm to investigate the case and whether any other football players had been targeted. The firm did not return phone or email messages left Friday.

Notre Dame officials believed Te'o's girlfriend — whether alive or dead — was at least a real person until the next day, when Stroz Friedberg said it could not find any evidence that Kekua or most of her relatives ever existed. And by Jan. 4, two days after hiring Stroz Friedberg, Notre Dame officials concluded Te'o was the victim of the hoax, there was no threat to the school and the private investigation was suspended.

"We concluded that this matter was personal to Manti," Jenkins wrote, deciding it was up to Te'o to disclose, especially after he signed with Creative Artists Agency on the day after the BCS game.

1/2

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WH, Senators to Begin Push on Immigration Reform

The White House and a bipartisan group of senators next week plan to begin their efforts to push for comprehensive immigration reform.

President Barack Obama will make an announcement on immigration during a Tuesday trip to Las Vegas, Nevada, the White House said on Friday. The Senate group is expected make their plans public around the same time, the Associated Press reported.

See Also: Where Do Labor Unions Stand on Immigration?

For Obama, immigration reform is a campaign promise that has remained unfulfilled from his first White House run in 2008. During his 2012 re-election campaign, the president vowed to renew his effort to overhaul the nation's immigration system. It has long been expected that Obama would roll out his plans shortly after his inauguration.

The president's trip to Las Vegas is designed "to redouble the administration's efforts to work with Congress to fix the broken immigration system this year," the White House said.

Ever since November's election, in which Latino voters turned out in record numbers, Republicans and Democrats have expressed a desire to work on immigration reform. Obama has long supported a bill that would make many of the nation's 11 million undocumented immigrants without criminal records eligible to apply for an earned pathway to citizenship, which includes paying fines and learning English.

Charles Dharapak/AP Photo

But the debate over a pathway to citizenship is expected to be contentious. Other flashpoints in an immigration reform push could include a guest-worker program, workplace enforcement efforts, border security, and immigration backlogs.

In a statement, the White House said that "any legislation must include a path to earned citizenship."

Ahead of his immigration push next week, Obama met today with a group of lawmakers from the Congressional Hispanic Caucus (CHC), including chairman Rubén Hinojosa (D-Texas) , Sen. Bob Menendez (D-N.J.), Democratic Caucus Chair Rep. Xavier Becerra (D-Calif.), and CHC Immigration Task Force Chair Rep. Luis Gutierrez (D-Ill.), the latter's office said. CHC members are expected to play a pivotal role in the debate.

"The president is the quarterback and he will direct the team, call the play, and be pivotal if we succeed. I am very optimistic based on conversations with Republicans in the House and Senate that we will do more than just talk about the immigration issue this year," Gutierrez said in a statement following the CHC meeting with Obama. "The president putting his full weight and attention behind getting a bill signed into law is tremendously helpful. We need the president and the American people all putting pressure on the Congress to act because nothing happens in the Capitol without people pushing from the outside."

A bipartisan group of eight senators, which includes Menendez, has also begun talks on drafting an immigration bill and will play an integral part in the process of passing a bill through Congress. Sen. Marco Rubio (R-Fla.), who has been participating in talks with others senators, has also unveiled his own outline for an immigration proposal.

The group of senators have reportedly eyed Friday as the date when they'll unveil their separate proposal, according to the Washington Post.

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Shrinking proton puzzle persists in new measurement

A puzzle at the heart of the atom refuses to go away. The most precise measurement yet of the proton's radius confirms that it sometimes seems smaller than the laws of physics demand – an issue that has been hotly debated for two years.

The latest finding deepens the need for exotic physics, or some other explanation, to account for the inconsistency. "If we were in a hole before, the hole is deeper now," says Gerald Miller of the University of Washington in Seattle, who was not involved in the new measurement.

The saga of the proton radius began in 2010, when a group led by Randolf Pohl at the Max Planck Institute of Quantum Optics in Garching, Germany, determined the width of the fuzzy ball of positive charge – and found it was smaller than had been assumed.

Previous teams had inferred the proton's radius, which is impossible to measure directly, by studying how electrons and protons interact. One method uses the simplest atom, hydrogen, which consists of one electron and one proton. A quirk of quantum mechanics says that an electron in an atom can only orbit its proton at certain distances, corresponding to different energy levels. The electron can jump between levels if it absorbs or releases energy in the form of a photon of light.

Ball of charge

By measuring the energy of photons emitted by an excited hydrogen atom, physicists can figure out how far apart the energy levels are, and thus the distances of the permitted electron orbits. A theory called quantum electrodynamics then allows them to calculate how far the proton's ball of charge must extend to keep the electrons at those distances.

This method gave a charge radius for the proton that was about 0.877 femtometres, less than a trillionth of a millimetre.

Pohl and colleagues used a novel method. They created an exotic version of hydrogen that replaces the electron with a muon, a particle that has the same charge as the electron but is 200 times heavier. Its extra bulk makes it more sensitive to the proton's size, meaning radius measurements based on muons are orders of magnitude more precise.

The new method didn't just make the measurements more precise. It also changed them: the muonic hydrogen gave a radius of 0.8418 femtometres, 4 per cent less than before.

Scandalous result

That might not sound like much, but in the world of particle physics, where theory and experiment can agree to parts in a billion, it was scandalous. A lively discussion sprang up, with some physicists claiming problems with Pohl's experiments and interpretations, and others suggesting gaps in the standard model of particle physics.

Pohl and colleagues have now repeated their experiment. The measurement of the radius is now even more precise than in 2010 – and it is still 4 per cent smaller than the value from hydrogen-based experiments.

Pohl reckons that there are three likely explanations. His experiment could have errors, although the confirmation makes that less likely. Alternatively, the electron experiments could be off. "This would be the most boring possibility," says Pohl.

The third, and most exciting, possibility is that muons do not interact with protons in the same way as electrons. In other words, the proton's apparent radius changes a little bit depending on which particle it is interacting with.

If true, that might require the existence of unknown particles that alter the way the muon interacts with the proton. Those particles could, in turn, solve some of the problems with the standard model of particle physics. They could, for instance, provide a candidate for dark matter, the mysterious stuff that makes up more than 80 per cent of the mass in the universe.

Monumental idea

Miller, Pohl and Ron Gilman of Rutgers University in Piscataway, New Jersey helped organise a workshop with 50 proton experts in Trento, Italy, last October to hash out the details of the problem – and arrived at a verdict of sorts. "Because the muon experiments seem to be so solid, the most popular answers were that there's some beyond-the-standard-model physics differentiating between muon and electron, which would be very important," Gilman says.

"That would be monumental, truly," Miller says.

But Miller also has a less radical suggestion, which could reconcile all the measurements without invoking new particles. According to quantum electrodynamics, two charged particles can interact with each other by exchanging a photon – it's as if they spontaneously create a basketball and throw it between them, he says.

The equations also allow for a more complicated interaction where the particles create two balls, and juggle them. Until now this type of interaction was considered too rare to be important, but Miller reckons that the muon's greater mass could make it a better juggler. That would strengthen the proton's interaction with it and make the proton look smaller to the muon without requiring any new physics.

All these ideas will be up for review in a few years' time when new experiments, including shooting muons at protons to see how they scatter and building muonic helium atoms to measure their energy levels, are completed.

"It's quite likely that through other experiments, in two to three years we might get an end to this," Miller says. "It shouldn't take forever."

Journal reference: Science, DOI: 10.1126/science.1230016

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N.Korea threatens South over UN sanctions

SEOUL: North Korea on Friday threatened "physical counter-measures" against rival South Korea over a tightening of UN sanctions against Pyongyang following its recent rocket launch.

"If the South Korean puppet regime of traitors directly participates in the so-called UN 'sanctions', strong physical countermeasures would be taken," the North's Committee for Peaceful Reunification of Fatherland said.

The warning, carried by the official Korean Central News Agency, came a day after North Korea threatened to conduct its third nuclear test and boost its capacity for a military strike on the United States.

"Sanctions amount to a declaration of war against us," said the committee, which is the prime state body responsible for inter-Korean dialogue and exchange.

While Thursday's threat had firmly targeted the United States, the latest warning focused Pyongyang's anger on the capitalist South.

"As long as the South Korean puppet traitors' regime continues with it's anti-DPRK (North Korea) hostile policy, we will never sit down with them," it said.

- AFP/fa

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