Rusty rocks reveal ancient origin of photosynthesis

SUN-WORSHIP began even earlier than we thought. The world's oldest sedimentary rocks suggest an early form of photosynthesis may have evolved almost 3.8 billion years ago, not long after life appeared on Earth.

A hallmark of photosynthesis in plants is that the process splits water and produces oxygen gas. But some groups of bacteria oxidise substances like iron instead – a form of photosynthesis that doesn't generate oxygen. Evolutionary biologists think these non-oxygen-generating forms of photosynthesis evolved first, giving rise to oxygen-generating photosynthesis sometime before the Earth's atmosphere gained oxygen 2.4 billion years ago (New Scientist, 8 December 2012, p 12).

But when did non-oxygen-generating photosynthesis evolve? Fossilised microbial mats that formed in shallow water 3.4 billion years ago in what is now South Africa show the chemical fingerprints of the process. However, geologists have long wondered whether even earlier evidence exists.

The world's oldest sedimentary rocks – a class of rock that can preserve evidence of life – are a logical place to look, says Andrew Czaja of the University of Cincinnati in Ohio. These rocks, which are found in Greenland and date back almost 3.8 billion years, contain vast deposits of iron oxide that are a puzzle. "What could have formed these giant masses of oxidised iron?" asks Czaja.

To investigate, he analysed the isotopic composition of samples taken from the oxidised iron. He found that some isotopes of iron were more common than they would be if oxygen gas was indiscriminately oxidising the metal. Moreover, the exact isotopic balance varied subtly from point to point in the rock.

Both findings make sense if photosynthetic bacteria were responsible for the iron oxide, says Czaja. That's because these microbes preferentially oxidise only a small fraction of the dissolved iron, and the iron isotopes they prefer vary slightly as environmental conditions change (Earth and Planetary Science Letters, doi.org/kh5). His findings suggest that this form of photosynthesis appeared about 370 million years earlier than we thought.

It is "the best current working hypothesis for the origin of these deposits", says Mike Tice of Texas A&M University in College Station – one of the team who analysed the 3.4-billion-year-old microbial mats from South Africa.

William Martin at the University of Düsseldorf, Germany, agrees. "Anoxygenic photosynthesis is a good candidate for the isotope evidence they see," he says. "Had these fascinating results been collected on Mars, the verdict of the jury would surely remain open," says Martin Brasier at the University of Oxford. "But [on Earth] opinion seems to be swinging in the direction of non-oxygen-generating photosynthesis during the interval from 3.8 to 2.9 billion years ago."

This article appeared in print under the headline "Photosynthesis has truly ancient origins"

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Tennis: Nishikori beats Cilic to reach Memphis semis

MEMPHIS, Tennessee - Fifth-seeded Kei Nishikori of Japan cruised past top-seeded Marin Cilic 6-4, 6-2 on Friday to reach the semi-finals of the US National Indoor Tennis Championships.

Croatia's Cilic had saved three match points in his previous match against Igor Sijsling, but could not find the answer against Nishikori, who had just four aces compared to a dozen for Cilic but won 69 percent of points on his serve.

"I was dominating with my serve," said the 23-year-old Nishikori, who also reached the semi-finals in Brisbane in January but retired from that match against Andy Murray with a knee injury.

Since then, he has reached the fourth round of the Australian Open.

"It's getting better every match... little by little," Nishikori said of his game.

He next faces Australian Marinko Matosevic, a 6-7 (6/8), 6-2, 6-4 winner over seventh-seeded Alexandr Dolgopolov of Ukraine.

Nishikori won their only prior meeting at Brisbane earlier this year.

The other men's semi-final in this combined ATP and WTA event will pit Spain's Feliciano Lopez against Uzbekistan's Denis Istoman.

Lopez defeated US wildcard Jack Sock 6-4, 6-3, and Istoman was a 6-4, 7-6 (7/5) winner over Michael Russell of the United States.

In women's action, big-hitting Sabine Lisicki of Germany set up a title showdown with Marina Erakovic.

Lisicki, the third seed, fell behind in each set but dug deep for a 7-5, 7-5 semi-final win over seventh-seeded Magdalena Rybarikova. She will be vying for a fourth career WTA title.

New Zealand's Erakovic defeated Stefanie Voegele of Switzerland 6-2, 6-4 to earn a shot at a first WTA title. She has two runner-up finishes on her resume, including in Memphis last year.

- AFP/ir

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Water tank body still mystery

STORY HIGHLIGHTS

• Cause of death deferred, pending further examination


• Tests show hotel water is free of harmful bacteria, health department says


• Canadian university says woman not registered in classes this year


• Water "had a very funny, sweety, disgusting taste," one guest says

Los Angeles (CNN) -- Two days after the grisly discovery, the case of the Los Angeles hotel water tank corpse is a mystery with many unanswered questions.

The decomposing body of Elisa Lam floated inside a water tank on the roof of the Cecil Hotel while guests brushed their teeth, bathed and drank with water from it for as long as 19 days.

A maintenance worker, checking on complaints about the hotel's water, found the 21-year-old Canadian tourist inside one of four water cisterns Tuesday morning, Los Angeles Police Sgt. Rudy Lopez said.

How and where did Elisa Lam die?

Body found in hotel water tank

HIDE CAPTION

Los Angeles robbery-homicide detectives are treating this as a suspicious death for obvious reasons, Lopez said. Falling into a covered water tank behind a locked door on top of a roof would be an unusual accident.

An autopsy was completed, but the cause of death is deferred pending further examination, assistant chief coroner Ed Winter said Thursday. That may take six to eight weeks.

It will be several weeks before investigators have the toxicology lab report which would show whether Lam had any drugs in her system.

Any marks, injuries or wounds may suggest Lam died elsewhere and was dumped into the tank by her killer.

Water in Lam's lungs could be a sign that she drowned, but it might not tell why she was inside the small tank.

One clue comes from security camera video of Lam inside a hotel elevator the last day she was seen.

She is seen walking into the elevator, pushing the buttons for four floors and then peering out of the opened elevator door as if she is hiding or looking for someone. Clad in a red hoodie, Lam at one point walks out of the elevator before returning to it, pushing the buttons again. She then stands outside the open elevator doorway, motioning with her hands, before apparently walking away.

Lam checked into the Cecil Hotel five days earlier, January 26, on her way to Santa Cruz, California, according to police in her hometown of Vancouver, British Columbia.

Why did it it take so long to find Lam?

Lam's parents reported the University of British Columbia student missing in early February. Her daily calls home stopped on January 31, police told reporters on February 6 at a Los Angeles news conference.

Because it was an international case -- and her parents and sister flew to California to find answers -- the case may have gotten more attention than most of the several thousand missing person reports made in Los Angeles each year.

A search of the hotel then found no sign of Lam, including a trip to the roof with a police search dog, Lopez said.

Strange things began happening with the hotel's water supply later in the month, according to Sabina and Michael Baugh, a British couple who spent eight days there until checking out Wednesday. The water pressure dropped to a trickle at times.

"The shower was awful," Sabina Baugh said. "When you turned the tap on, the water was coming black first for two seconds and then it was going back to normal."

The tap water "tasted horrible," Baugh said. "It had a very funny, sweety, disgusting taste. It's a very strange taste. I can barely describe it."

But for a week, they never complained. "We never thought anything of it," she said. "We thought it was just the way it was here."

Knowing now what they didn't know then about the water is sickening, Michael Baugh said. "It makes you feel literally physically sick, but more than that you feel it psychologically. You think about it and it's not good."

Eventually, the hotel maintenance department investigated the water problem, sending a worker to look into the tank, police said. He saw Lam's lifeless body at the bottom.

A hard-working family

Randy Schmidt, a spokesman for the University of British Columbia, said Lam was registered in a class in August, but was not registered in any classes this year, according to records.

"Unfortunately, we do not have much more to say, other than to extend our deepest sympathies to the family," said Schmidt.

According to Los Angeles police, Lam tended to use public transportation.

Teika Steins, manager of a hostel in Toronto, Canada, said Lam stayed a week there in early December. Steins called the young woman friendly and outgoing.

Flowers and signs were left Thursday outside the temporarily-closed Lam family restaurant in Burnaby, British Columbia.

Tanya Grohmann, who works nearby, said she was saddened by the loss and the fact the family did not know what happened to the young woman.

"They are a hard-working family. They immigrated here," she told CNN affiliate CTV. "They've been in the neighborhood for nine years working. ... They're honest people."

Why did hotel stay open after discovery?

New guests continued to check into the Cecil in the hours after firefighters removed Lam's body from the water tank. But each guest was asked to sign a waiver releasing the hotel from liability if they become ill. "You do so at your own risk and peril," the hotel's release said. Guests who already paid for their rooms would not get refunds if they move out, it said.

CNN's repeated calls to the hotel for comment were unreturned Wednesday and Thursday.

The Los Angeles Public Health Department immediately tested the water supply, but told the manager they could stay open as long as they provided bottle water and warned guests not to drink the tap water.

The results of the testing showed no harmful bacteria in the tank or the pipes, according to Angelo Bellomo, director of environmental health for the department. Chlorine in the city's water may be the reason it is safe, he said.

All of the tanks and pipes in the building still must be drained, flushed and sanitized, Bellomo said. The water will be retested after that process, which should take several days, he said.

Several guests interviewed by CNN on Wednesday indicated the hotel management did not tell them about the body in the water supply they had been drinking and bathing in.

Qui Nguyen learned about it from a CNN reporter Wednesday morning. He decided not to sign the waiver and instead find a new hotel.

Many of its guests are tourists from other countries drawn by the hotel's billing as a "European-style" hotel that is the perfect accommodation for "spend-thrifty travelers."

But if they take Kim Cooper's tour bus ride through the neighborhood, they would hear about the Cecil being the former temporary home to at least two convicted murderers, including "Night Stalker" serial killer Richard Ramirez. Ramirez paid $14 a day to stay on the 14th floor during his 1980s killing spree, Cooper said.

The Cecil Hotel is "in the heart of the action, allowing our guest to embrace the city and the surrounding areas that make Los Angeles famous," according to the description you'll hear when you call there and are placed on hold.

In fact, the hotel is just a few blocks away from the infamous Skid Row district in downtown Los Angeles, but 16 miles from the beaches of Santa Monica, eight miles from Hollywood's Walk of Fame and 12 miles from glamorous streets of Beverly Hills that are prominently featured on the Cecil's website.

If you want a reservation at the Cecil you will have to wait until next month. The website said the hotel is "sold out" until March 1. After then, you can book a room for $65.

Hotel with corpse in water tank has notorious past

CNN's Kyung Lah, Chandler Friedman and Chuck Conder contributed to this report.

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Pentagon grounds F-35 fleet after engine crack found

Updated 9:03 PM ET

WASHINGTON The Pentagon on Friday grounded its fleet of F-35 fighter jets after discovering a cracked engine blade in one plane.

The problem was discovered during what the Pentagon called a routine inspection at Edwards Air Force Base, Calif., of an F-35A, the Air Force version of the sleek new plane. The Navy and the Marine Corps are buying other versions of the F-35, which is intended to replace older fighters like the Air Force F-16 and the Navy F/A-18.

All versions -- a total of 51 planes -- were grounded Friday pending a more in-depth evaluation of the problem discovered at Edwards. None of the planes have been fielded for combat operations; all are undergoing testing.

In a brief written statement, the Pentagon said it is too early to know the full impact of the newly discovered problem.

A watchdog group, the Project on Government Oversight, said the grounding is not likely to mean a significant delay in the effort to field the stealthy aircraft.

"The F-35 is a huge problem because of its growing, already unaffordable, cost and its gigantically disappointing performance," the group's Winslow Wheeler said. "That performance would be unacceptable even if the aircraft met its far-too-modest requirements, but it is not."

The F-35 is the Pentagon's most expensive weapons program at a total estimated cost of nearly $400 billion. The Pentagon envisions buying more than 2,400 F-35s, but some members of Congress are balking at the price tag.

Friday's suspension of flight operations will remain in effect until an investigation of the problem's root cause is determined.

The Pentagon said the engine in which the problem was discovered is being shipped to a Pratt & Whitney facility in Connecticut for more thorough evaluation.

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Cyberattacks Bring Attention to Security Reform

Recent accusations of a large-scale cyber crime effort by the Chinese government left many wondering what immediate steps the president and Congress are taking to prevent these attacks from happening again.

On Wednesday, the White House released the administration's Strategy on Mitigating the Theft of U.S. Trade Secrets as a follow-up to the president's executive order. The strategy did not outwardly mention China, but it implied U.S. government awareness of the problem.

"We are taking a whole of government approach to stop the theft of trade secrets by foreign competitors or foreign governments by any means -- cyber or otherwise," U.S. Intellectual Property Enforcement Coordinator Victoria Espinel said in a White House statement.

As of now, the administration's strategy is the first direct step in addressing cybersecurity, but in order for change to happen Congress needs to be involved. So far, the Cyber Intelligence Sharing and Protection Act (CISPA) is the most notable Congressional legislation addressing the problem, despite its past controversy.

Last April, CISPA was introduced by House Intelligence Committee Chairman Mike Rogers, R-Mich., and Rep. Dutch Ruppersberger, D-Md. The act would allow private companies with consumer information to voluntarily share those details with the NSA and the DOD in order to combat cyber attacks.

Peter Parks/AFP/Getty Images

The companies would be protected from any liabilities if the information was somehow mishandled. This portion of the act sounded alarm bells for CISPA's opponents, like the ACLU, which worried that this provision would incentivize companies to share individuals' information with disregard.

CISPA passed in the House of Representatives, despite a veto threat from the White House stemming from similar privacy concerns. The bill then died in the Senate.

This year, CISPA was reintroduced the day after the State of the Union address during which the president declared an executive order targeting similar security concerns from a government standpoint.

In contrast to CISPA, the executive order would be initiated on the end of the government, and federal agencies would share relevant information regarding threats with private industries, rather than asking businesses to supply data details. All information shared by the government would be unclassified.

At the core of both the executive order and CISPA, U.S. businesses and the government would be encouraged to work together to combat cyber threats. However, each option would clearly take a different route to collaboration. The difference seems minimal, but has been the subject of legislative debates between the president and Congress for almost a year, until now.

"My response to the president's executive order is very positive," Ruppersberger told ABC News. "[The president] brought up how important information sharing is [and] by addressing critical infrastructure, he took care of another hurdle that we do not have to deal with."

Addressing privacy roadblocks, CISPA backers said the sharing of private customer information with the government, as long as personal details are stripped, is not unprecedented.

"Think of what we do with HIPAA in the medical professions; [doctors do not need to know] the individual person, just the symptoms to diagnose a disease," Michigan Gov. John Engler testified at a House Intelligence Committee hearing in an attempt to put the problem into context.

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Mood-sensing smartphone tells your shrink how you feel

PEOPLE with anxiety, depression or stress are often asked to record their mood changes throughout the day, helping psychologists fine-tune their treatment. But they often forget, recording only sparse information at best. Now an emotion-sensing smartphone app that automatically generates someone's "mood diary" could give psychologists all the data they need.

It's the brainchild of Matt Dobson and Duncan Barclay, founders of speech recognition firm EI Technologies, based in Saffron Walden, UK. Instead of relying on people writing diaries, the app, called Xpression, listens for telltale changes in a person's voice that indicate whether they are in one of five emotional states: calm, happy, sad, angry or anxious/frightened. It then lists a person's moods against the times they change, and automatically emails the list to their psychologist at the end of the day.

To work, the app has to be always on, listening out for the user's voice once every second, whether they are talking to family, friends, colleagues or even pets. It also listens in on phone calls. If the user is silent, the app does nothing. Crucially for the users' privacy, it doesn't record their words, instead seeking out telltale acoustic features – like pitch – that are indicative of emotional state.

This kind of emotion recognition via voice pattern already works well and is a "hot area" of research, says Stephen Cox, head of the speech processing lab at the University of East Anglia in Norwich, UK, who is scientific adviser for the firm.

Initially, Xpression will send 200-millisecond-long acoustic snapshots to a remote server where a machine-learning system will work out a person's emotional state before sending it back to the app for storage. Factors like voice loudness, intensity, changes in pitch and speaking pace allow the system to accurately estimate somebody's emotional state. "We extract acoustic features and let the machine-learning system work it out," says Cox. This ability will be built into the app itself eventually, says Dobson.

There's a strong need for this kind of technology, says Adrian Skinner, a clinical psychologist with the UK's National Health Service in Harrogate, North Yorkshire. "With conditions like depression, people tend to stop doing things like filling in mood diaries. If this app gives us more complete diaries it could help us better find the day-to-day triggers that raise or lower a patient's mood," he says.

The firm is a finalist in a UK government competition to identify the nation's top mobile tech company, to be judged on 26 February. An insurance company has already expressed an interest in using the app to ensure the workplace stress therapy it pays for is effective. Clinical trials are due to take place later this year.

This article appeared in print under the headline "We know how you really feel"

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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Wilmar International's Q4 net profit falls 4.7%

SINGAPORE: Wilmar International's net profit in the fourth quarter fell 4.7 per cent, weighed mainly by lower palm oil prices.

Fourth-quarter net profit was US$476.8 million (S$590 million), down from US$500 million recorded in the same period in 2011.

A decline in crude palm oil prices hit profits in the firm's plantations segment, which were down 23 per cent compared to the previous year.

Fourth-quarter revenue rose 0.9 per cent on year to US$11.6 billion (S$14.4 billion).

Wilmar International's chairman and CEO Kuok Khoon Hong said the Group remains positive on its long term prospects due to "good economic growth" in its main markets of China, India and Indonesia and robust business model.

Separately, Wilmar International and Noble Group also announced a joint venture to develop palm projects in Papua, Indonesia.

In a statement, the companies said Wilmar's subsidiary Newbloom will hold a 53.74 per cent equity stake in the venture while Noble unit Noble Plantations will own a 46.27 per cent stake.

The joint venture owns a majority interest in PT Henrison Inti Persada, which owns 22,953 hectares of land in Papua.

- CNA/ck

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Rapper among dead in Las Vegas shooting, crash

STORY HIGHLIGHTS

• NEW: Kenneth Cherry Jr., a rapper known as Kenny Clutch, was killed, his lawyer says


• Gunfire and a fiery crash kill 3 in the heart of Las Vegas Strip


• Casino visitor describes seeing "fireball" from Caesars Palace


• Police are looking for a black Range Rover Sport with large black rims

Las Vegas (CNN) -- A shooting and a fiery crash left three people dead in the neon heart of the Las Vegas Strip on Thursday, and police scrambled to find out who triggered the carnage.

The bloodshed closed the Strip for about a block and a half around some of its biggest draws, leaving tourists gaping at a wrecked Maserati, a burned-out taxi and four other vehicles.

"First time in Vegas, and then, like, the whole thing, what you know from movies only -- I was shocked," Christine Gerstenberger, who was visiting the desert gambling mecca from Germany, said Thursday afternoon. She and her brothers debated going back to the hotel "because I'm totally scared," but "We're too curious," she said.

See iReporter's video of fire

One of those killed was Kenneth Cherry Jr. -- a rapper also known as Kenny Clutch -- his attorney Vicki Greco said. According to his Facebook page, Cherry is from Oakland, California, and lived in Las Vegas.

Cherry's death was shocking, Greco said.

"Out of everyone I know in the rapping industry there is no way I would have ever, ever expected to find that he was shot on the Las Vegas strip in such an aggressive manner," said Greco, who said Cherry had two kids. "He didn't have a (criminal) record or a history. He was just a good kid trying to make it and be a good father."

Four of the Nevada city's biggest casinos -- Caesars Palace, the Bellagio, Bally's and the Flamingo -- are nearby, and police collected surveillance-camera video from them to help the probe.

Also killed in the incident was a cab driver named Michael Boldon, CNN affiliate KVVU reported.

His family is devastated by the death of the 62-year-old cab driver, his brother Tehran Boldon told the affiliate.

"It is gut-wrenching," a tearful Tehran Boldon told KVVU. "My life mission would be to see them punished and brought to justice for the senseless thing they did."

It started around 4:20 a.m. with a dispute in the valet lot of the Aria Hotel, about a block away, Sheriff Douglas Gillespie said. Investigators haven't confirmed the cause of the altercation, but he said it spilled onto the street as someone in a black Range Rover Sport fired several shots at the Maserati as it headed north on Las Vegas Boulevard.

When the driver was hit, the Maserati continued into the intersection of the boulevard and Flamingo Road and collided with a taxi, which caught fire. The sports car's driver, the cab driver and a passenger in the taxi all died; a passenger in the Maserati and three other people in the resulting pileup were hurt, Gillespie said.

The Maserati's passenger and other witnesses are helping detectives piece together what happened, he said. And the "top priority" for police is to find the Range Rover, which sped away from the intersection, and those inside it when the shooting happened.

"This act is totally unacceptable, and we are going to make a very clear message to these individuals in regards to that," Gillespie said.

Police in neighboring states have been asked to look for the sport-utility vehicle, and Gillespie warned the occupants should be considered armed and dangerous.

"Clearly, the suspects have no regard for the lives and safety of others," he said.

The Range Rover had an out-of-state dealer plate, tinted windows and large, black rims, Las Vegas Police Sgt. John Sheahan said.

The block around the crash remained closed off into Thursday afternoon. John Lamb, who was inside Caesars Palace, told CNN affiliate KLAS he heard the commotion and saw the taxi on fire from a window.

"There was a loud bang, and I hear two other booms. I looked out my window at Caesars Palace ... and could see the fireball," he told KLAS.

Man kills 3, himself in Southern California shooting

CNN's Cristy Lenz, Matt Smith, Tom Watkins, Jason Hanna and Deanna Hackney contributed to this report.

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Arias Challenged On Pedophilia Claim

Accused murderer Jodi Arias was challenged today by phone records, text message records, and her own diary entries that appeared to contradict her claim that she caught her ex-boyfriend, Travis Alexander, looking at pictures of naked boys.

Arias had said during her testimony that one afternoon in January 2008, she walked in on Alexander masturbating to pictures of naked boys. She said she fled from the home, threw up, drove around aimlessly, and ignored numerous phone calls from Alexander because she was so upset at what she had seen.

The claim was central to the defense's accusation that Alexander was a "sexual deviant" who grew angry and abusive toward Arias in the months after the incident, culminating in a violent confrontation in June that left Alexander dead.

Arias claimed she killed him in self-defense. She could face the death penalty if convicted of murder.

Catching Up on the Trial? Check Out ABC News' Jodi Arias Trial Coverage

Today, prosecutor Juan Martinez, who has been aggressive in questioning witnesses throughout the trial, volleyed questions at her about the claim of pedophilia, asking her to explain why her and Alexander's cell phone records showed five calls back and forth between the pair throughout the day she allegedly fled in horror. Some of the calls were often initiated Arias, according to phone records.

Jodi Arias Doesn't Remember Stabbing Ex-Boyfriend Watch Video

Jodi Arias Murder Trial: Testimony About Ex's Death Watch Video

Arias on Ex-Boyfriend's Death: 'I Don't Remember' Watch Video

She and Alexander also exchanged text messages throughout the afternoon and evening at a time when Arias claims the pedophilia incident occurred. In those messages they discuss logistics of exchanging one another's cars that night. Alexander sends her text messages about the car from a church social event he attended that night that she never mentioned during her testimony.

Arias stuck by her claim that she saw Alexander masturbating to the pictures, and her voice remained steady under increasingly-loud questioning by Martinez.

But Martinez also sparred with Arias on the stand over minor issues, such as when he asked Arias detailed questions about the timing and order of events from that day and Arias said she could not remember them.

"It seems you have problems with your memory. Is this a longstanding thing? Since you started testifying?" Martinez asked.

"No it goes back farther than that. I don't know even know if I'd call it a problem," Arias said.

"How far back does it go? You don't want to call them problems, are they issues? Can we call them issues? When did you start having them?" he asked in rapid succession. "You say you have memory problems, that it depends on the circumstance. Give me the factors that influence that."

"Usually when men like you or Travis are screaming at me," Arias shot back from the stand. "It affects my brain, it makes my brain scramble."

"You're saying it's Mr. Martinez's fault?" Martinez asked, referring to himself in the third person.

"Objection your honor," Arias' attorney finally shouted. "This is a stunt!"

Timeline of the Jodi Arias Trial

Martinez dwelled at one point about a journal entry where Arias wrote that she missed the Mormon baptism of her friend Lonnie because she was having kinky sex with Alexander. He drew attention to prior testimony that she and Alexander used Tootsie Pops and Pop Rocks candy as sexual props.

"You're trying to get across (in the diary entry) that this involved a sexual liaison with Mr. Alexander right?" he asked. "And you're talking about Tootsie Pops and Pop Rocks?"

"That happened also that night," Arias said.

"You were there, enjoying it, the Tootsie Pops and Pop Rocks?" he asked again, prompting a smirk from Arias.

"I enjoyed his attention," Arias said.

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Higgs may spell doom, unless supersymmetry saves us

Lisa Grossman, physical sciences reporter

(Image: CERN)

Is the Higgs boson a herald of the apocalypse? That's the suggestion behind a theory, developed more than 30 years ago, that is back in the headlines this week. According to physicists, the mass of the Higgs-like particle announced last summer supports the notion that our universe is teetering on the edge of stability, like a pencil balanced on its point.

"It may be that the universe we live in is inherently unstable," Joseph Lykken, of the Fermi National Accelerator Laboratory in Batavia, Illinois, said on Monday at a meeting of the American Association for the Advancement of Science. "At some point, billions of years from now, it's all going to be wiped out."

Physicists have been wringing their hands about this scenario since 1982, when theorists Michael Turner and Frank Wilczek published a paper about it in Nature, NBC News points out. The pair showed that the vacuum of space can be in different energy states, and it will be most stable at its lowest energy. Trouble arises if we're not there yet, and we're inhabiting a temporarily stable state that should ultimately collapse.

"The universe wants to be in a different state, so eventually to realize that, a little bubble of what you might think of as an alternate universe will appear somewhere, and it will spread out and destroy us," Lykken said at AAAS.

Enter the Higgs boson, the particle form of the field that gives mass to several fundamental particles. The Higgs field permeates the vacuum of space, which means the mass of the boson and the stability of the vacuum are closely intertwined. Theory predicted that if the Higgs boson is heavier than about 129 gigaelectronvolts (GeV), the universe should be on safe footing.

But in July 2012 physicists at CERN, near Geneva, Switzerland announced that a particle closely matching the Higgs had been found by experiments in the Large Hadron Collider (LHC). The much celebrated particle has a mass of about 126 GeV - light enough to raise fears of instability.

There is still hope for the universe as we know it. Some theorists pointed out that the relationship between the Higgs mass and the vacuum of space depends on the mass of a particle called the top quark. If the top quark's mass is different than we think it is, stability might reign.

There are also anomalies with the Higgs measurement, like the fact that it decays into photons more often than predicted. That hints we may yet find particles from the theory of supersymmetry, which says each ordinary particle has heavier "superpartners". If the Higgs has such a relative, it might save us from destruction. But some of these predicted particles, particularly the superpartners of the top quark, can push the universe back into instability.

The worries may remain unconfirmed for a while. The LHC is shutting down for a two-year break so engineers can prepare the machine to shoot higher-energy particle beams, which are needed to probe for superpartners.

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