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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Sri Lanka bans women from being maids abroad

COLOMBO: Sri Lanka has said that it would bar women of all ages from travelling abroad to work in menial jobs, following the beheading of a young nanny in Saudi Arabia.

Information Minister Keheliya Rambukwella announced that women under 25 were now banned from going to the Arab state to work as maids, adding that it was the first step towards a worldwide travel ban for low-paying jobs.

The move was in response to the execution earlier this month at a prison in Riyadh of Sri Lankan maid Rizana Nafik, who was only 17 when she was charged with smothering a four-month-old baby in Saudi Arabia in 2005.

"As a first step we are raising the age limit to 25. We will gradually move towards a total ban on our women going abroad to do low-paying jobs," Rambukwella told reporters.

He did not say by when the total ban would kick in, but said the authorities have started to discourage women from going to the Middle East, especially Saudi Arabia where most maids are paid less than $300 a month.

Nafik was beheaded after she was found guilty of smothering an infant in her care after an argument with the child's mother, the Saudi interior ministry has said.

The US and the United Nations led international condemnation of the Saudi authorities over the January 9 execution.

Nearly 1.7 million Sri Lankans are employed abroad and the $6 billion they sent home last year is a key source of foreign exchange for the government.

- AFP/sf

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Apple fires supplier after audit uncovers underage workers

Workers assemble and perform quality control checks on MacBook Pro display enclosures at an Apple supplier facility in Shanghai.

(Credit:
Apple)

Apple severed its relationship with a China-based third-party labor supplier after discovering dozens of underage workers employed there, Apple reported in its latest Supplier Responsibility report, which was released this evening.

The iPhone maker said it discovered the violations during an audit of the supplier, Guangdong Real Faith Pingzhou Electronics (PZ). In addition, Apple reported the labor agency that knowingly provided the child labor to PZ to local authorizes.

The agency, which allegedly conspired with the children's families to falsify age-verification documents, had its license suspended and levied a fine.

"The children were returned to their families, and PZ was required to pay expenses to facilitate their successful return," Apple said in its report (PDF). "In addition, the company that subcontracted its work to PZ was prompted by our findings to audit its other subcontractors for underage labor violations -- proving that one discovery can have far-reaching impact."

The revelation was included Apple's annual report on its efforts to improve employee safety and working conditions at its manufacturing partners' production facilities. The report comes a few months after Apple supplier Foxconn admitted last October it had hired interns that were under 16 -- China's legal working age.

The company said it conducted 393 audits in its supply chain last year, a 72 percent increase over 2011. The audits included reviews on environmental and operations safety, business practices, and recruitment.

The company said it achieved an average 92 percent supplier compliance with the maximum 60-hour work week. Apple says it is now tracking more than 1 million workers in its supply chain and posting the results each month on its Web site.

More to come...

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Deformed Dolphin Accepted Into New Family

In 2011, behavioral ecologists Alexander Wilson and Jens Krause of the Leibniz-Institute of Freshwater Ecology and Inland Fisheries in Germany were surprised to discover that a group of sperm whales (Physeter macrocephalus)—animals not usually known for forging bonds with other species—had taken in an adult bottlenose dolphin (Tursiops truncatus).

The researchers observed the group in the ocean surrounding the Azores (map)—about 1,000 miles (1,600 kilometers) off the coast of Lisbon, Portugal—for eight days as the dolphin traveled, foraged, and played with both the adult whales and their calves. When the dolphin rubbed its body against the whales, they would sometimes return the gesture.

Among terrestrial animals, cross-species interactions are not uncommon. These mostly temporary alliances are forged for foraging benefits and protection against predators, said Wilson.

They could also be satisfying a desire for the company of other animals, added marine biologist John Francis, vice president for research, conservation, and exploration at the National Geographic Society (the Society owns National Geographic News).

Photographs of dogs nursing tiger cubs, stories of a signing gorilla adopting a pet cat, and videos of a leopard caring for a baby baboon have long circulated the Web and caught national attention.

A Rare Alliance

And although dolphins are known for being sociable animals, Wilson called the alliance between sperm whale and bottlenose dolphin rare, as it has never, to his knowledge, been witnessed before.

This association may have started with something called bow riding, a common behavior among dolphins during which they ride the pressure waves generated by the bow of a ship or, in this case, whales, suggested Francis.

"Hanging around slower creatures to catch a ride might have been the first advantage [of such behavior]," he said, adding that this may have also started out as simply a playful encounter.

Wilson suggested that the dolphin's peculiar spinal shape made it more likely to initiate an interaction with the large and slow-moving whales. "Perhaps it could not keep up with or was picked on by other members of its dolphin group," he said in an email.

Default

But the "million-dollar question," as Wilson puts it, is why the whales accepted the lone dolphin. Among several theories presented in an upcoming paper in Aquatic Mammals describing the scientists' observations, they propose that the dolphin may have been regarded as nonthreatening and that it was accepted by default because of the way adult sperm whales "babysit" their calves.

Sperm whales alternate their dives between group members, always leaving one adult near the surface to watch the juveniles. "What is likely is that the presence of the calves—which cannot dive very deep or for very long—allowed the dolphin to maintain contact with the group," Wilson said.

Wilson doesn't believe the dolphin approached the sperm whales for help in protecting itself from predators, since there aren't many dolphin predators in the waters surrounding the Azores.

But Francis was not so quick to discount the idea. "I don't buy that there is no predator in the lifelong experience of the whales and dolphins frequenting the Azores," he said.

He suggested that it could be just as possible that the sperm whales accepted the dolphin for added protection against their own predators, like the killer whale (Orcinus orca), while traveling. "They see killer whales off the Azores, and while they may not be around regularly, it does not take a lot of encounters to make [other] whales defensive," he said.

Read More..

It's Official: Women Will Serve in Combat

Women will soon be able to serve in combat, as things officially changed with the stroke of a pen today at the Pentagon.

At a joint news conference, Secretary of Defense Leon Panetta and Joint Chiefs of Staff Charman Gen. Martin Dempsey signed a memorandum rolling back a 1994 directive prohibiting women from doing so.

"They serve, they're wounded, and they die right next to each other," Panetta said of women and men in the military. "The time has come to recognize that reality.

"If they're willing to put their lives on the line, then we need to recognize that they deserve a chance," Panetta said, noting that he wants his own granddaughters and grandsons to have the same opportunities in their lives and careers.

The change won't be immediate, however. While Panetta announced that thousands of new positions will now be open to women, he has asked the military branches to submit plans by May on how to integrate women into combat operations. He set a January 2016 deadline for branches to implement the changes, giving military services time to seek waivers for certain jobs.

Both Panetta and Dempsey said they believe the move will strengthen the U.S. military force.

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"Ultimately, we are acting to strengthen the armed forces," Dempsey said. "We will extend opportunities to women in a way that maintains readiness, morale and unit cohesion."

Women have already served in combat in Iraq and Afghanistan, as ABC News' Martha Raddatz and Elizabeth Gorman reported in 2009: Prohibited from serving in roles "whose primary mission is to engage in direct combat on the ground," women in support roles, nonetheless, served in support roles on the frontlines, where they have fought, been wounded and died.

Women have also flown combat missions since 1993 and have served on submarines since 2010.

Panetta noted that 152 women have died serving in the U.S. military in Iraq and Afghanistan. Dempsey said he realized a change was inevitable when he noticed two female turret gunners protecting a senior military officer.

"It's clear to all of us that women are contributing in unprecedented ways to the military's mission of defending the nation," Panetta said. "Women represent 15 percent of the force of over 200,000 [and] are serving in a growing number of critical roles on and off the battlefield.

"I've gone to Bethesda to visit wounded warriors, and I've gone to Arlington to bury our dead. There's no distincton."

Panetta and Dempsey said President Obama supported the move, while warning them to maintain military readiness as they considered the change.

Obama hailed the move in a written statement

"Today, by moving to open more military positions -- including ground combat units -- to women, our armed forces have taken another historic step toward harnessing the talents and skills of all our citizens," he said.

"This milestone reflects the courageous and patriotic service of women through more than two centuries of American history and the indispensable role of women in today's military," Obama said.

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Wallace: Wonders of nature have been solace of my life

Alfred Russel Wallace discovered natural selection independently of Charles Darwin. Through his letters, available online for the first time, he tells us of his research, expeditions and enduring fascination for nature's mysteries.

You are famously joint author, with Darwin, of the first paper describing the origin of species and natural selection, published in 1858. When did you first get the idea?
I begin [in 1847] to feel rather dissatisfied with a mere local collection – little is to be learnt by it. I sh[ould]d like to take some one family, to study thoroughly – principally with a view to the theory of the origin of species. By that means I am strongly of [the] opinion that some definite results might be arrived at.

This desire led you to Brazil to collect birds, butterflies and beetles to try to discover what drives the evolution of new species. Were there any incidents on the voyage?
On Friday the 6th of August [1852]… the Captain (who was the owner of the vessel) came into the cabin & said "I am afraid the ship's on fire. Come & see what you think of it."

Despite that harrowing experience, you next undertook an 8 year expedition to the Malay Archipelago, where you discovered the invisible boundary between the animals of Asia and the Australian region, which would later be called the Wallace Line in your honour. What fascinated you most on that trip?
The Birds have however interested me much more than the insects, they are proportionally much more numerous, and throw great light on the laws of Geographical distribution of Animals in the East… As an instance I may mention the Cockatoos, a group of birds confined to Australia & the Moluccas, but quite unknown in Java Borneo Sumatra & Malacca… Many other species illustrate the same fact.

You have been famously good-natured about sharing the discovery of natural selection with Darwin…
I also look upon it as a most fortunate circumstance that I had a short time ago commenced a correspondence with Mr. Darwin on the subject of "Varieties", since it has led to the earlier publication of a portion of his researches & has secured to him a claim to priority which an independent publication either by myself or some other party might have injuriously effected

What did you and Darwin have in common?
In early life both Darwin and myself became ardent beetle-hunters. Both Darwin and myself had, what he terms "the mere passion of collecting"… Now it is this superficial and almost child-like interest in the outward forms of living things, which, though often despised as unscientific, happened to be the only one which would lead us towards a solution of the problem of species.

Do you feel your contribution has been overlooked?
The idea came to me, as it had come to Darwin, in a sudden flash of insight: it was thought out in a few hours – was written down with such a sketch of its various applications and developments… then copied on thin letter-paper and sent off to Darwin – all within one week.

I should have had no cause for complaint if the respective shares of Darwin and myself in regard to the elucidation of nature's method of organic development had been thenceforth estimated as being, roughly, proportional to the time we had each bestowed upon it when it was thus first given to the world – that is to say, as 20 years is to one week.

You helped Darwin with the puzzle of bright colouration in animals, which led to the concept of warning colours. To ask his question again, why are some caterpillars so brightly coloured?
[Since some]… are protected by a disagreeable taste or odour, it would be a positive advantage to them never to be mistaken for any of the palatable caterpillars… Any gaudy & conspicuous colour therefore, that would plainly distinguish them from the brown & green eatable caterpillars, would enable birds to recognise them easily as a kind not fit for food, & thus they would escape seizure which is as bad as being eaten.

How did you feel looking back on your life's work, at the age of 89?
The wonders of nature have been the delight and solace of… life. Nature has afforded… an ever increasing rapture, and the attempt to solve some of her myriad problems an ever-growing sense of mystery and awe.

Do you have a message for our readers?
I sincerely wish you all some of the delight in the mere contemplation of nature's mysteries and beauties which I have enjoyed.

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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Football: Real Madrid break 500m-euro mark to top money list

LONDON: Real Madrid have become the first club in any sport to generate more than 500 million euros in revenue in a single year, according to the business advisory firm Deloitte.

The company's Football Money League, published for the 16th time on Thursday, sees Spanish champions Madrid retain their hold on first place ahead of perennial rivals Barcelona.

In an unchanged top six, Manchester United remain third, Bayern Munich fourth, European champions Chelsea fifth and Arsenal sixth, but English champions Manchester City soar five places to seventh.

AC Milan fall one place to eighth, with Liverpool remaining ninth and Italian champions Juventus rising three places to complete the top 10.

Madrid's revenue rose by seven percent to 512.6 million euros in the 2011-2012 season, equivalent to £414.7 million or $644.7 million at June 2012 exchange rates.

It enabled the nine-time European champions to hold onto top spot in the ranking for an eighth successive year, matching United's record from 1996-1997 to 2003-2004.

"It is an impressive achievement for Real Madrid to have surpassed 500 million euros in revenue in a single year," said Dan Jones from Deloitte's Sports Business Group.

"Real have led the way in the phenomenal rate of revenue growth achieved by the game's top clubs, with the double-digit (10-percent) increase by the top 20 clubs representing continued strong performance in these tough economic times.

"The combined revenues of the top 20 clubs have quadrupled since we began our analysis in 1996-1997."

Madrid triumphed in the Spanish Liga in 2011-2012, ending three years of dominance by arch-rivals Barcelona, but lost out in the Champions League after being beaten by Bayern in the semi-finals.

Overall, the combined revenue of the world's 20 highest-earning football clubs grew by 10 percent on the previous year to reach 4.8 billion euros.

City's climb of five places was matched by German champions Borussia Dortmund, who rose to 11th, and Italian side Napoli (15th).

"Manchester City's Premier League title-winning season, combined with participation in the UEFA Champions League, helped drive 51-percent revenue growth to 285.6 million euros, the largest absolute and relative growth of any Money League club," said Deloitte's Austin Houlihan.

"The club's progress to the top of the English and European game means that they are set to remain a top 10 Money League club for the foreseeable future."

The only new entry in the list was English side Newcastle United, who moved into the top 20 at the expense of Spanish club Valencia after a surprise fifth-place finish in the Premier League last season.

The English top flight remains the most well-represented league in the ranking, with seven of the 20 clubs hailing from the Premier League.

The Deloitte Football Money League 2013 (position, previous year's position, club, country, revenue in 2011-2012):

1. (1) Real Madrid (ESP) 512.6 million euros (£414.7 million)

2. (2) Barcelona (ESP) 483 million (390.8 million)

3. (3) Manchester United (ENG) 395.9 million (230.3 million)

4. (4) Bayern Munich (GER) 368.4 million (298.1 million)

5. (5) Chelsea (ENG) 322.6 million (261 million)

6. (6) Arsenal (ENG) 290.3 million (234.9 million)

7. (12) Manchester City (ENG) 285.6 million (231.1 million)

8. (7) AC Milan (ITA) 256.9 million (207.9 million)

9. (9) Liverpool (ENG) 233.2 million (188.7 million)

10. (13) Juventus (ITA) 195.4 million (158.1 million)

11. (16) Borussia Dortmund (GER) 189.1 million (153 million)

12. (8) Inter Milan (ITA) 185.9 million (150.4 million)

13. (11) Tottenham Hotspur (ENG) 178.2 million (144.2 million)

14. (10) Schalke 04 (GER) 174.5 million (141.2 million)

15. (20) Napoli (ITA) 148.4 million (120.1 million)

16. (14) Marseille (FRA) 135.7 million (109.8 million)

17. (17) Lyon (FRA) 131.9 million (106.7 million)

18. (18) Hamburg (GER) 121.1 million (98 million)

19. (15) Roma (ITA) 115.9 million (93.8 million)

20. (new) Newcastle United (ENG) 115.3 million (93.3 million)

- AFP/al

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'jOBS' biopic starring Ashton Kutcher to hit theaters April 19

Ashton Kutcher as Apple co-founder Steve Jobs.

(Credit:
Sundance )

The Steve Jobs biopic starring Ashton Kutcher will open in theaters on April 19, the movie's distributor announced today.

The indie film, which is set to debut Friday at the Sundance Film Festival in Park City, Utah, on Firday, covers Jobs' life during the years 1971 through 2000 -- a time frame that includes the founding of Apple, as well as his ouster, the forming of NeXT and Pixar, and then his return to the company when Apple acquired NeXT.

The movie should not to be confused with a separate production penned by "The Social Network" and "The West Wing" writer Aaron Sorkin. That movie is said to be based on Walter Isaacson's biography, while "jOBS" is based on widely available information.

Principal photography on "jOBS" began at Jobs' childhood home in Los Altos, Calif., in June. Photos from the production have since leaked out, showing Kutcher and others in costume.

Along with Kutcher, the movie also stars Matthew Modine as former Apple CEO John Sculley, Josh Gad as Apple co-founder Steve Wozniak, and "The Help" star Ahna O'Reilly playing Chris-Ann Brennan, Jobs' girlfriend, and the mother of his daughter Lisa. Other additions include J.K. Simmons and Kevin Dunn, who will play venture capitalist Arthur Rock and former Apple CEO Gil Amelio respectively.

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Deformed Dolphin Accepted Into New Family

In 2011, behavioral ecologists Alexander Wilson and Jens Krause of the Leibniz-Institute of Freshwater Ecology and Inland Fisheries in Germany were surprised to discover that a group of sperm whales (Physeter macrocephalus)—animals not usually known for forging bonds with other species—had taken in an adult bottlenose dolphin (Tursiops truncatus).

The researchers observed the group in the ocean surrounding the Azores (map)—about 1,000 miles (1,600 kilometers) off the coast of Lisbon, Portugal—for eight days as the dolphin traveled, foraged, and played with both the adult whales and their calves. When the dolphin rubbed its body against the whales, they would sometimes return the gesture.

Among terrestrial animals, cross-species interactions are not uncommon. These mostly temporary alliances are forged for foraging benefits and protection against predators, said Wilson.

They could also be satisfying a desire for the company of other animals, added marine biologist John Francis, vice president for research, conservation, and exploration at the National Geographic Society (the Society owns National Geographic news).

Photographs of dogs nursing tiger cubs, stories of a signing gorilla adopting a pet cat, and videos of a leopard caring for a baby baboon have long circulated the web and caught national attention.

A Rare Alliance

And although dolphins are known for being sociable animals, Wilson called the alliance between sperm whale and bottlenose dolphin rare, as it has never, to his knowledge, been witnessed before.

This association may have started with something called bow riding, a common behavior among dolphins during which they ride the pressure waves generated by the bow of a ship or, in this case, whales, suggested Francis.

"Hanging around slower creatures to catch a ride might have been the first advantage [of such behavior]," he said, adding that this may have also started out as simply a playful encounter.

Wilson suggested that the dolphin's peculiar spinal shape made it more likely to initiate an interaction with the large and slow-moving whales. "Perhaps it could not keep up with or was picked on by other members of its dolphin group," he said in an email.

Default

But the "million-dollar question," as Wilson puts it, is why the whales accepted the lone dolphin. Among several theories presented in an upcoming paper in Aquatic Mammals describing the scientists' observations, they propose that the dolphin may have been regarded as nonthreatening and that it was accepted by default because of the way adult sperm whales "babysit" their calves.

Sperm whales alternate their dives between group members, always leaving one adult near the surface to watch the juveniles. "What is likely is that the presence of the calves—which cannot dive very deep or for very long—allowed the dolphin to maintain contact with the group," Wilson said.

Wilson doesn't believe the dolphin approached the sperm whales for help in protecting itself from predators, since there aren't many dolphin predators in the waters surrounding the Azores.

But Francis was not so quick to discount the idea. "I don't buy that there is no predator in the lifelong experience of the whales and dolphins frequenting the Azores," he said.

He suggested that it could be just as possible that the sperm whales accepted the dolphin for added protection against their own predators, like the killer whale (Orcinus orca), while traveling. "They see killer whales off the Azores, and while they may not be around regularly, it does not take a lot of encounters to make [other] whales defensive," he said.

Read More..