Quantum skyfall puts Einstein's gravity to the test

DIVIDING a falling cloud of frozen atoms sounds like an exotic weather experiment. In fact, it's the latest way to probe whether tiny objects obey Einstein's theory of general relativity, our leading explanation for gravity.

General relativity is based on the equivalence principle, which says that in free fall, all objects fall at the same rate, whatever their mass, provided the only force at work is gravity. That has been proven for large objects: legend has it that Galileo did it first by dropping various balls from the Tower of Pisa. Whether equivalence holds at quantum scales, where gravity's effects are not well understood, isn't clear. Figuring it out could help create a quantum theory of gravity, one of the biggest goals of modern physics.

Creating a quantum equivalent of Galileo's test isn't easy. In 2010 a team led by Ernst Rasel of the University of Hannover in Germany monitored a quantum object in free fall, by tossing a Bose-Einstein condensate (BEC) – a cloud of chilled atoms that behaves as a single quantum object and so is both particle and wave – down a 110-metre tall tower. Now they have split and recombined the wave – all before the BEC, made of rubidium atoms, reached the bottom. This produces an interference pattern that records the path of the falling atoms and can be used to calculate their acceleration (Physical Review Letters, doi.org/km6). The next step is to do the same experiment on a different kind of atom, with a different mass, to see if the equivalence principle holds.

The BEC can only be split for 100 milliseconds in the tower before hitting the bottom, so to allow tiny differences between the atom types to emerge, the work must be repeated in space, where the waves can be split for longer. By showing that a matter-wave can be split and recombined while falling, Rasel's result is a "major step" towards the space version, says Charles Wang of the University of Aberdeen, UK.

This article appeared in print under the headline "Quantum skyfall tests Einstein's gravity"

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Basketball: Knicks withstand Curry's 54 points to beat Warriors

NEW YORK: The New York Knicks withstood a dazzling 54-point display from Golden State's Stephen Curry on Wednesday to post a 109-105 NBA victory over the Warriors at Madison Square Garden.

Curry's points total was the highest in the league this season, surpassing the 52 of Oklahoma City's Kevin Durant against Dallas last month.

But his individual effort was not enough against a Knicks team that received 35 points from Carmelo Anthony and 26 off the bench from JR Smith.

Tyson Chandler contributed 16 points for New York and grabbed a career-best 28 rebounds.

Curry and the Warriors nearly claimed the victory despite the absence of David Lee, serving a one-game suspension for his role in an altercation with the Pacers' Roy Hibbert at Indiana on Tuesday that included several players and saw the shoving match spill into the spectator area behind the basket.

Curry made 11 of his 13 attempts from three-point range, one short of the league single-game record. He added seven assists and six rebounds.

Carl Landry scored 15 points and Jarrett Jack chipped in 14 for the Warriors.

Curry became the first player to score at least 50 points at Madison Square Garden since LeBron James did it with the Cavaliers in 2009.

He scored or assisted on Golden State's last 20 points. By then the New York crowd was cheering him, but the Knicks held the Warriors scoreless for the last two minutes of the contest.

After Raymond Felton denied Curry's jump shot with 1:28 remaining and the score knotted at 105-105, New York's Smith made a jump shot that gave the Knicks the lead for good.

"We closed out," Knicks coach Mike Woodson said. "We made the defensive stops we had to make coming down the stretch.

"We made plays, but boy, you've got to tip your hat to Curry. He played great."

- AFP/fa

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Viddy doubles length of clips, adds video enhancement tools

Viddy's new iOS app.

(Credit:
Viddy)

Social video startup video has released a new iOS app with a bevy of new features to help users enhance the videos they produce and stave off Twitter's upstart video-sharing app Vine.

Debuting this evening in Apple's App Store, the new app doubles the size of videos users can upload from 15 seconds to 30 seconds, as well as adding the Vine-like ability to pause recording to splice together segments into a single clip. The app also adds 15 new video filters, licensed music tracks from popular artists that can be added to videos, and stop-motion functionality that adjusts video frame rates.

Viddy, which is sometimes referred to as the Instagram of video, also social discovery tools to help users find and share videos that are important to them. The update adds a section with curated video categories and trending topics. A geo-centric feed spotlights videos from specific regions, while another feed focuses on user interests and preferences.

In another Twitter-like feature, Viddy will add a verified user program for celebrities, public figures, and company brands.

The new video comes in the wake of corporate upheaval at the Venice, Calif.-based startup. The company, which claims 40 million users, revealed earlier this week that it had laid off a dozen employees, or about a third of its work force. The cuts came less than a month after the firing of co-founder and CEO Brett O'Brien, who was rumored to have turned down a buyout offer from Twitter, which ended up buying Vine and launching its app last month.

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Why African Rhinos Are Facing a Crisis

The body count for African rhinos killed for their horns is approaching crisis proportions, according to the latest figures released by the International Union for Conservation of Nature (IUCN).

To National Geographic reporter Peter Gwin, the dire numbers—a rhinoceros slain every 11 minutes since the beginning of 2013—don't come as a surprise. "The killing will continue as long as criminal gangs know they can expect high profits for selling horns to Asian buyers," said Gwin, who wrote about the violent and illegal trade in rhino horn in the March 2012 issue of the magazine.

The recent surge in poaching has been fueled by a thriving market in Vietnam and China for rhino horn, used as a traditional medicine believed to cure everything from hangovers to cancer. Since 2011, at least 1,700 rhinos, or 7 percent of the total population, have been killed and their horns hacked off, according to the IUCN. More than two-thirds of the casualties occurred in South Africa, home to 73 percent of the world's wild rhinos. In Africa there are currently 5,055 black rhinos, listed as critically endangered by the IUCN, and 20,405 white rhinos. (From our blog: "South African Rhino Poaching Hits New High.")

Trying to snuff out poaching by itself won't work, said Gwin. The South African government is fighting a losing battle on the ground to gangs using helicopters, dart guns, high-powered weapons—and lots of money. (National Geographic pictures: The bloody poaching battle over rhino horn [contains graphic images].)

"Every year they get tougher on poaching, but rhino killings continue to rise astronomically," said Gwin. "Somehow they have to address the demand side in a meaningful way. This means either shutting down the Asian markets for rhino horn, or controversially, finding a way to sustainably harvest rhino horns, control their legal sale, and meet what appears to be a huge demand. Either will be a formidable endeavor."

Hope and Hurdles

The signing in December of a memorandum of understanding between South Africa and Vietnam to deal with rhino poaching and other conservation issues raises hope for some concrete action. Observers say the next step is for the two governments to follow through with tangible crime-stopping efforts such as intelligence sharing and other collaboration. The highest hurdle to stopping criminal trade, though, is cultural, Gwin believes. "In Vietnam and China, a lot of people simply believe that as a traditional cure, rhino horn works." (Related: "Blood Ivory.")

The recent climb in rhino deaths threatens what had been a conservation success story. Since 1995, due to better law enforcement, monitoring, and other actions, the overall rhino numbers have steadily risen. The poaching epidemic, the IUCN warns, could dramatically slow and possibly reverse population gains.

The population growth is also being stymied by South Africa's private game farmers, who breed rhinos for sport hunting and tourism and for many years have helped rebuild rhino numbers. Many of them are getting out of the business due to the high costs of security and other risks associated with the poaching invasions.

Those who still have rhinos on their farms will often pay a veterinarian to cut the horns off—under government supervision—to dissuade poachers, but the process costs more than $2,000 and has to be repeated when the horns grow back every two years. Even then the farmers are stuck with horns that are illegal to sell—and which criminals seek to obtain.

Room for Debate

Rhino killings and the trade in their horns will be a major topic at a high-profile conference, the 16th meeting of the Conference of the Parties to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), which opens in Bangkok March 3. What won't surprise Gwin is if the issue of sustainably harvesting rhino horns from live animals comes up for discussion.

"It's an idea that seems to be gaining traction among some South African politicians and law enforcement circles," he said, noting that the international conservation community strongly opposes any talk of legalizing the trade of rhino horn, sustainably harvested or not. The bottom line for all parties in the discussion is clear, said Gwin: "The slaughter has to stop if rhinos are to survive."

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Arias Prosecutor Too Combative, Experts Say

He has barked, yelled, been sarcastic and demanded answers from accused murderer Jodi Arias this week.

And in doing so, prosecutor Juan Martinez and his aggressive antics may be turning off the jury he is hoping to convince that Arias killed her ex-boyfriend Travis Alexander in June 2008, experts told ABCNews.com today.

"Martinez is his own worst enemy," Mel McDonald, a prominent Phoenix defense attorney and former judge, told ABC News. "He takes it to the point where it's ad nauseam. You have difficulty recognizing when he's driving the point home because he's always angry and pushy and pacing around the courtroom. He loses the effectiveness, rather than build it up."

"He's like a rabid dog and believes you've got to go to everybody's throat," he said.

"If they convict her and give her death, they do it in spite of Juan, not because of him," McDonald added.

Martinez's needling style was on display again today as he pestered Arias to admit that she willingly participated in kinky sex with Alexander, though she previously testified that she only succumbed to his erotic fantasies to please him.

Arias, now 32, and Alexander, who was 27 at the time of his death, dated for a year and continued to sleep together for another year following their break-up.

Arias drove to his house in Mesa, Ariz., in June 2008, had sex with him, they took nude photos together and she killed him in his shower. She claims it was in self-defense. If convicted, Arias could face the death penalty.

Jodi Arias, Prosecutor Butt Heads in Cross-Examination Watch Video

Jodi Arias Maintains She 'Felt Like a Prostitute' Watch Video

Jodi Arias Admits to Killing Man, Lying to Police Watch Video

Martinez also attempted to point out inconsistencies in her story of the killing, bickering with her over details about her journey from Yreka, Calif., to Mesa, Ariz., including why she borrowed gas cans from an ex-boyfriend, when she allegedly took naps and got lost while driving, and why she spontaneously decided to visit Alexander at his home in Mesa for a sexual liaison.

"I want to know what you're talking about," Arias said to Martinez at one point.

"No, I'm asking you," he yelled.

Later, he bellowed, "Am I asking you if you're telling the truth?"

"I don't know," Arias said, firing back at him. "Are you?"

During three days of cross examining Arias this week, Martinez has spent hours going back and forth with the defendant over word choice, her memory, and her answers to his questions.

"Everyone who takes witness stand for defense is an enemy," McDonald said. "He prides himself on being able to work by rarely referring to his notes, but what he's giving up in that is that there's so much time he wastes on stupid comments. A lot of what I've heard is utterly objectionable."

Martinez's behavior has spurred frequent objections of "witness badgering" from Arias' attorney Kirk Nurmi, who at one point Tuesday stood up in court and appealed to the judge to have a conference with all of the attorneys before questioning continued. Judge Sherry Stephens at one point admonished Martinez and Arias for speaking over one another.

Andy Hill, a former spokesperson for the Phoenix police department, and Steven Pitt, a forensic psychiatrist who has testified as an expert witness at many trials in the Phoenix area, both said that despite his aggressive style, Martinez would likely succeed in obtaining a guilty verdict.

"When it comes to cross examination, one size does not fit all," said Pitt. "But if you set aside the incessant sparring, what the prosecutor I believe is effectively doing is pointing out the various inconsistencies in the defendant's version of events."

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Newly spotted comet to buzz Mars in 2014

Lisa Grossman, physical sciences reporter

A Martian sunset, as seen by NASA's Spirit rover in 2005.
(Image: Mars Exploration Rover Mission, Texas A&M, Cornell, JPL, NASA)

There's a new comet in town, and it is making a beeline for Mars. If projections of its orbit are correct, the icy visitor will buzz the Red Planet in October 2014.

Dubbed C/2013 A1, the comet was discovered on 3 January by prolific comet hunter Robert McNaught at Siding Spring Observatory in New South Wales, Australia. Colleagues at the Catalina Sky Survey in Arizona found images of the comet in their catalogue that date back to 8 December 2012, giving additional information about its movements.

These observations allowed astronomers to trace the comet's likely path around the sun. The calculated trajectory has C/2013 A1 crossing Mars' orbit on 19 October 2014, according to Australian blogger Ian Musgrave.

That doesn't necessarily mean a collision will occur. The best estimates right now have the comet passing a safe distance of 900,000 kilometres from the Martian surface. Asteroid 2012 DA14 got much closer to Earth last week, skimming by at a distance of 34,400 kilometres. But with so little data in hand, the calculations are not precise. It's possible the comet will miss Mars by as much as 36 million kilometres - or it could smack right into the planet. "An impact can't be ruled out at this stage," Musgrave wrote.

From Earth, we should be able to see the comet and Mars sitting side by side through small telescopes. And from Mars, the comet could be as spectacular as the expected "supercomet" ISON, which will come into view this year and could outshine the full moon.

Assuming the comet's orbit brings it close enough - but not too close - to Mars, the object should be visible either by rovers on the surface or the armada of Mars-orbiting satellites, which have a history of snapping spectacular shots of the Red Planet and its neighborhood.

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Ferrari goes up in flames at Teban Gardens

SINGAPORE: A red Ferrari went up in flames near Teban Gardens Road on Wednesday.

A Channel NewsAsia viewer was having his lunch at a coffee shop in the vicinity when he heard an explosion.

According to the viewer, the red Ferrari had stopped in front of block 54 Teban Gardens Road, along Penjuru Road.

The Chinese male driver had gotten out of the car before the explosion.

The driver did not appear to have been injured.

The Singapore Civil Defence Force (SCDF) arrived five minutes later and put out the fire.

SCDF confirmed that there were no reported injuries and that no other vehicle was involved in the incident.

The cause of the fire is being investigated.

- CNA/ck

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Yahoo admits new work policy contrary to industry view

Yahoo says work at the office, or work for someone else.

In response to the uproar caused by its recently announced telecommuting policy, Yahoo issued a brief statement this evening acknowledging that its work-at-home ban runs contrary to the tech industry as a whole.

"This isn't a broad industry view on working from home," Yahoo said in a statement published by The New York Times. "This is about what is right for Yahoo right now."

A spokesperson declined to elaborate, saying, "We don't discuss internal matters."

Yahoo's new policy, which requires employees to work in the company's offices, immediately ignited a firestorm of criticism. In a memo that leaked out over the weekend, Human Resources chief Jackie Reses informed the company's workforce that as of June, any existing work-from-home arrangements would no longer be honored.

"To become the absolute best place to work, communication and collaboration will be important, so we need to be working side-by-side," reads the memo.

The new policy was immediately criticized as standoffish in an industry where competition is intense for talented employees and especially ill advised at a company that has over the years battled declining morale among the rank and file. Some pointed out that CEO Marissa Mayer, a new mother who reportedly took only two weeks of maternity leave, should have more empathy for the needs of employees juggling time-conflicting commitments.

However, while working at home has become common at many tech companies, especially at ones eager to show off the benefits of collaborative Web-based software tools, some say the creative process suffers by not being able to share ideas in person.

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A History of Balloon Crashes

A hot-air balloon exploded in Egypt yesterday as it carried 19 people over ancient ruins near Luxor. The cause is believed to be a torn gas hose. In Egypt as in many other countries, balloon rides are a popular way to sightsee. (Read about unmanned flight in National Geographic magazine.)

The sport of hot-air ballooning dates to 1783, when a French balloon took to the skies with a sheep, a rooster, and a duck. Apparently, they landed safely. But throughout the history of the sport, there have been tragedies like the one in Egypt. (See pictures of personal-flight technology.)

1785: Pioneering balloonist Jean-Francois Pilatre de Rozier and pilot Pierre Romain died when their balloon caught fire, possibly from a stray spark, and crashed during an attempt to cross the English Channel. They were the first to die in a balloon crash.

1923: Five balloonists participating in the Gordon Bennett Cup, a multi-day race that dates to 1906, were killed when lightning struck their balloons.

1924: Meteorologist C. LeRoy Meisinger and U.S. Army balloonist James T. Neely died after a lightning strike. They had set off from Scott Field in Illinois during a storm to study air pressure. Popular Mechanics dubbed them "martyrs of science."

1995: Tragedy strikes the Gordon Bennett Cup again. Belarusian forces shot down one of three balloons that drifted into their airspace from Poland. The two Americans on board died. The other balloonists were detained and fined for entering Belarus without a visa. (Read about modern explorers who take to the skies.)

1989: Two hot air balloons collided during a sightseeing trip near Alice Springs, Australia. One balloon crashed to the ground killing all 13 people on board. The pilot of the other balloon was sentenced to a two-year prison term for "committing a dangerous act." Until today, this was considered the most deadly balloon accident.

2012: A balloon hit a power line and caught fire in New Zealand, killing all 11 on board. Investigators later determined that the pilot was not licensed to fly and had not taken  proper safety measures during the crash, like triggering the balloon's parachute and deflation system.

2012: A sightseeing balloon carrying 32 people crashed and caught fire during a thunderstorm in the Ljubljana Marshes in Slovenia. Six died; many other passengers were injured.

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Inside Organized Retail Crime Raids

We used to call it shoplifting, but these days the foot soldiers of retail crime rings are known as boosters. Police even have an acronym for these operations: ORC, which stands for Organized Retail Crime.

"It's just like a Fortune 500 company," said Sergeant Eric Lee of the Gardena Police Department in Gardena, Calif. "All of this is just organized."

Watch the full story on "Nightline" TONIGHT at 12:35 a.m. ET

Police say big retail stores, from Walgreens to J.C. Penny, are getting hit by highly sophisticated shoplifting networks that steal and resell everything from underwear to razors to milk. According to the National Retail Federation, theft can amount to annual losses as high as a $37 billion for retail businesses.

"Every store in every city has to go through this," Lee said. "They wait until no one's paying attention and they walk out."

Tide detergent is currently a hot target because it is compact, expensive and easy to sell on the streets for profit, police said. The Street name: "liquid gold."

"Sometimes we get rings that just do alcohol," Lee said. "And then we get some that do just meat and seafood."

Investigators say boosters move the loot for cents on the dollar to fencing operations -- the black market resellers of the stolen goods -- which sell the stolen merchandise in plain sight in stores. Boosters, fencers, Mr. Bigs, all of those involved in these shoplifting operations can potentially make millions a year from boosting and re-selling stolen goods.

Craigslist Crackdown: Cops Go After Thieves Watch Video

And Mike Swett is on the case. A former Riverside County sheriff's deputy in Los Angeles, Swett was badly injured in a car wreck and now works as a full-time private investigator on the ORC beat who has worked with Target, Marshalls, T.J. Maxx. Stores hire him to do his own undercover police work, catching thieves before involving local law enforcement.

"Kind of like working a narcotics case, it's like you've got low-level, mid-level and then top dog," Swett said. "We like to go after the top dog and the only way to get to the top dog is mid-level first."

At his command center -- his apartment -- Swett showed off the boxes upon boxes of tapes and photographs he has collected, the fruits of countless silent stake-out hours.

Swett said he has been casing two joints in L.A. for months, both alleged to be mid-level fencing operations. "Nightline" was invited to ride along with him when he sent undercover agents in for a final reconnaissance mission.

At some stores and shopping malls, clerks do little to stop shoplifters and often let them run, which has contributed to the growing fencing operations.

"[The stores] don't want their employees to get injured," Swett said. "So oftentimes they will call the police, but by the time we get there they are already in their car and they are gone."

This leaves professional investigators like Swett to put the pieces together and bust open the gangs to lead over-stretched police departments to the prey.

When raid day arrived, a motorcade of squad cars departed from the Gardena, Calif., police department and pulled up to one fencing operation. Swett said the merchandise being sold was boosted goods.

"There is Victoria's Secret, expensive Victoria's Secret, the gift sets," he said, pointing down a line of tables. "J.C. Penny, Miramax, its real stuff not counterfeit."

He spotted a bottle of Katy Perry brand perfume, which usually retails for around $90 but one seller had it priced at $59.

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