2,500 needy families to get help with childcare costs

SINGAPORE: Some 2,500 low-income families will benefit from a S$250,000 initiative to help their children.

The five Commmunity Development Councils will help identify eligible families with monthly household incomes of less than S$3,500.

OCBC Bank will also contribute S$100 when a low-income family deposits the first S$50 into their Child Development Account (CDA).

Under the existing Baby Bonus scheme, the government will match the contributions to the CDA dollar for dollar.

The money in the account can then be used at approved institutions for the child's development and healthcare needs.

Acting Minister for Social and Family Development Chan Chun Sing said: "This year, we have also expanded the kinds of things that you can spend the CDA money (on). For example, it will also include early intervention programmes, visits to the doctor, medical insurance and purchase of healthcare-related products. We hope that in this small way, we can help families to defray the cost of bringing up the children, especially for the needy families."

Under the initiative, parents can also attend financial literary talks by OCBC Bank staff volunteers to learn more about money management.

- CNA/xq

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Pearlman: I think Bobby Petrino is slime

Bobby Petrino was named head coach at Western Kentucky, months after being embroiled in scandal at University of Arkansas

STORY HIGHLIGHTS

• Bobby Petrino was named the new football coach at Western Kentucky this week


• Hiring came just months after he was fired from Arkansas amid scandal


• Jeff Pearlman says, sadly, this is no surprise in big-time college sports


• He says the vast majority of players are ultimately hurt by the behavior of coaches and administrators

Editor's note: Jeff Pearlman is the author of 'Sweetness: The Enigmatic Life of Walter Payton.' He blogs at jeffpearlman.com. Follow him on Twitter.

(CNN) -- I have a dog named Norma.

She is a small beige cockapoo who barks at the mailman.

I would not trust Bobby Petrino to watch her.

Jeff Pearlman

I also would not trust Bobby Petrino to take my car in for a tire change. I would not trust Bobby Petrino to deposit my Aunt Ruth's Social Security check. I wouldn't trust him to clean my bowling ball, shop for a Christmas ham, change a twenty for two tens, tell me the time or recite the proper lyrics to Blind Melon's "No Rain."

This is not because I am a particularly untrusting person.

No, it's because I think Bobby Petrino is slime.

In case you missed the news, two days ago Western Kentucky University held a press conference to announce that Petrino, undeniably one of the nation's elite football minds, had agreed to a four-year, $850,000 per year deal to take over the Hilltoppers.

With nearly 400 giddy sports fanatics in attendance, Petrino, standing alongside Todd Stewart, the school's athletic director, spoke of honor and loyalty and love and redemption. The ensuing press release, issued by Western Kentucky's sports information department, was straight out of Disney: 101. It made Petrino sound like a cross between Vince Lombardi, Martin Luther King and Gandhi; God's gift to young men seeking to better themselves.

Petrino fired as Arkansas head football coach

What it failed to mention—and what the school desperately wants everyone to fail to mention—is that Petrino may well be the least ethically whole man in the, ahem, ethically whole-deprived world of Division I collegiate sports.

Why, it was only seven months ago that Petrino, at the time the University of Arkansas' head coach, was riding his motorcycle when he crashed along Highway 16 near Crosses, Arkansas.

When asked by school officials to explain what had happened, he failed to mention that, eh, also on the bike was Jessica Dorrell, a 26-year-old former Razorbacks volleyball player who worked as the student-athlete development coordinator for the football program. It turned out that Petrino, a married father of four, was not only having an affair with Dorrell (who was engaged at the time), but was a key voice on the board that hired her for the position when she wasn't even remotely qualified.

During an ensuing university investigation, it was determined that Petrino made a previously undisclosed $20,000 cash gift to Dorrell as a Christmas present.

Ho, ho, ho.

To his credit, Jeff Long, the school's athletic director, defied the wishes of every pigskin-blinded Razorback fan and fired Petrino. In a statement, he rightly wrote that, "all of these facts, individually and collectively, are clearly contrary to character and responsibilities of the person occupying the position of the Head Football Coach—an individual who should serve as a role model and a leader for our student-athlete."

Now, ethics and morals and character be damned, Bobby Petrino has returned, spewing off nonsense about second chances (Ever notice how garbage men and bus drivers rarely get the second chances we are all—according to fallen athletic figures—rightly afforded as Americans?) and learning from mistakes and making things right.

Western Kentucky, a school with mediocre athletics and apparently, sub-mediocre standards, has turned to a person who lied to his last employer about the nature of an accident involving the mistress he allegedly hired to a university position she was unqualified to hold. Please, if you must, take a second to read that again. And again. And again.

Bobby Petrino, holder of a Ph.D. in the Deceptive Arts (he also ditched the University of Louisville shortly after signing a long-term extension in 2007, and quit as coach of the Atlanta Falcons 13 game into his first season later that year. He informed his players via a note atop their lockers), will be the one charged with teaching the 17- and 18-year-old boys who decide to come to Bowling Green about not merely football, but life. He will be their guide. Their compass. Their role model.

Bobby Petrino and social media prove a bad mix

Sadly, in the world of Division I sports, such is far from surprising. This has been a year unlike any other; one where the virtues of greed and the color of green don't merely cloak big-time college athletics, but control them. In case you haven't noticed, we are in the midst of a dizzying, nauseating game of Conference Jump, where colleges and universities—once determined to maintain geographic rivals in order to limit student travel—have lost their collective minds.

The University of Maryland, a charter member of the ACC, is headed for the Big Ten. The Big East—formerly a power conference featuring the likes of Syracuse, Georgetown, St. John's and Connecticut—has added Boise State, San Diego State, Memphis, Houston, Southern Methodist and Navy. Idaho moved from the WAC to the Big Sky, Middle Tennessee State and Florida Atlantic went to Conference USA, the University of Denver—a member of the WAC for approximately 27 minutes—joined the Summit League. Which, to be honest, I didn't even know existed.

Rest assured, none of these moves (literally, nary a one) were conducted with the best interests of so-called student-athletes in mind. New conferences tend to offer increased payouts, increased merchandising opportunities, increased exposure and increased opportunities to build a new stadium—one with 80,000 seats, 100 luxury boxes, $20 million naming rights, $9 hot dogs and the perfect spot for ESPN to broadcast its Home Depot pregame show.

Why, within 24 hours of quarterback Johnny Manziel winning the Heisman Trophy, Texas A&M was hawking Heisman T-shirts for $24 on its website (Or, for a mere $54.98, one can purchase his No. 2 jersey).

Percentage of the dough that winds up in Manziel's pocket? Zero.

After another spectacular exit, Petrino eyes football return

That, really, is the rub of it all; of Petrino's crabgrass-like revival; of coaches bounding from one job for another (even as players can only do so after sitting out a year); of Rutgers moving west and San Diego State moving east and athletic department officials moving on up (to a penthouse apartment in the sky); of $54.98 jerseys.

It's the athletes ultimately getting screwed.

Sure, for the 0.5% of Division I football players who wind up in the NFL, the deal is a sweet one. The other 99.5%, however, are mere pawns, sold a dizzying narrative of glory and fame and lifelong achievement, but, more often than not, left uneducated, unfulfilled and physically battered.

They are told a coach will be with them for four years—then watch as said figure takes a $2 million gig elsewhere but, hey, only because it was right for him and his family.

They are told they will receive a great education, then find themselves stuck on a six-hour flight from California to Newark, New Jersey. They are told that these will be the greatest years of their life, that the college experience is a special one, that only the highest of standards exist.

Then they meet their new coach: Bobby Petrino.

Follow @CNNOpinion on Twitter

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The opinions expressed in this commentary are solely those of Jeff Pearlman.

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Hundreds pack Conn. church for vigil after rampage

Updated 11:39 PM ET

NEWTOWN, Conn. Twenty-six candles — one for each of the victims — flickered on the altar Friday as hundreds of grief-stricken residents gathered for a vigil in memory of the children and staff killed in a shooting rampage at a school in this Connecticut town.

With the church filled to capacity, hundreds spilled outside, holding hands in circles in the cold night air and saying prayers. Others sang "Silent Night" or huddled near the windows of St. Rose of Lima Roman Catholic church.

"Many of us today and in the coming days will rely on what we have been taught and what we believe, that there is faith for a reason," Gov. Dannel P. Malloy said at the vigil Mass.

The residents were gathered to mourn those whose lives were lost when a 20-year-old man killed his mother at their home, then descended on Sandy Hook Elementary School, opening fire as youngsters cowered in fear amid the sounds of gunshots and screams. Twenty children were among the 26 dead at the school.

The shooter, Adam Lanza, armed with at least two handguns, committed suicide, authorities said.

Even though there were 26 candles on the altar, Monsignor Robert Weiss said it was important to remember everyone who died, including Lanza and his mother.

"Ours is not to judge or to question," he told reporters after the service. "But we are really holding in our hearts especially the children and the staff of the school."

"These 20 children were just beautiful, beautiful children," Weiss said. "These 20 children lit up this community better than all these Christmas lights we have. ... There are a lot brighter stars up there tonight because of these kids."

Weiss said he spent much of the day trying to console those who had lost a child or other family member, adding that he had no answers for their questions of how something so horrible could happen.

But through their sorrow, some parents found solace in remembering their loved ones, he said. One father whose son was killed recalled how his boy had made his first soccer goal this year.

Some parents said they struggled with mixed emotions after their own children survived the massacre that took so many young lives.

After receiving word of the shooting, Tracy Hoekenga said she was paralyzed with fear for her two boys, fourth-grader C.J. and second-grader Matthew.

"I couldn't breathe. It's indescribable. For a half an hour, 45 minutes, I had no idea if my kids were OK," she said.

Matthew said a teacher ordered him and other students to their cubbies, and a police officer came and told them to line up and close their eyes.

"They said there could be bad stuff. So we closed our eyes and we went out. When we opened our eyes, we saw a lot of broken glass and blood on the ground," he said.

David Connors, whose triplets attend the school, said his children were told to hide in a closet during the lockdown.

"My son said he did hear some gunshots, as many as 10," he said. "The questions are starting to come out: `Are we safe? Is the bad guy gone?"'

At the vigil, Newtown High School freshman Claudia Morris, 14, said students had gathered in the school hallways after the massacre, asking each other, "Are you all right? Are you all right?"

"No one has answers to why this happened," she said. "It just seems so unreal."

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School Shooting: Officials Seek Details on Gunman

The FBI is in at least three states interviewing relatives and friends of the elementary school gunman who killed 20 children, seven adults and himself, trying to put together a better picture of the shooter and uncover any possible explanation for the massacre, ABC News has learned.

The authorities have fanned out to New Jersey, Connecticut and Massachusetts to interview relatives of Adam Lanza, 20, and his mother, who was one of Lanza's shooting victims.

The victims died Friday when Lanza invaded Sandy Hook Elementary School in Newtown, Conn., and sprayed staff and students with bullets, officials said. Lanza also was found dead in the school.

Lt. Paul Vance said 18 children died in the school and two more died later in a hospital.

Six adults also were slain, bringing the total to 26. Among them was the school's principal, Dawn Hochsprung, multiple sources told ABC News. Another adult victim was teacher Vicki Soto, her cousin confirmed.

In addition to the casualties at the school, Lanza's mother, Nancy Lanza, was killed in her home, federal and state sources told ABC News.

According to sources, Lanza shot his mother in the face, then left his house armed with at least two semi-automatic handguns, a Glock and a Sig Sauer, and a semi-automatic rifle. He was also wearing a bulletproof vest.

READ: Connecticut Shooter Adam Lanza: 'Obviously Not Well'

Lanza then drove to the elementary school and continued his rampage, authorities said.

Newtown Teacher Kept 1st Graders Calm During Massacre Watch Video

Newtown School Shooting: What to Tell Your Kids Watch Video

It appeared that Lanza died from what was believed to be a self-inflicted gunshot wound. The rifle was found in his car.

"Evil visited this community today," Gov. Dan Malloy said at a news conference Friday evening.

CLICK HERE for more photos from the scene.

In the early confusion surrounding the investigation, federal sources initially identified the suspect as Adam's older brother Ryan Lanza, 24. Identification belonging to Ryan Lanza was found at the shooting scene, federal sources told ABC News.

Ryan Lanza soon took to Facebook to say he was alive and not responsible for the shooting. He later was questioned by police.

During the rampage, first-grade teacher Kaitlin Roig, 29, locked her 14 students in a class bathroom and listened to "tons of shooting" until police came to help.

"It was horrific," Roig said. "I thought we were going to die."

She said that the terrified kids were saying, "I just want Christmas. ... I don't want to die. I just want to have Christmas."

A tearful President Obama said Friday that there was "not a parent in America who doesn't feel the overwhelming grief that I do."

The president had to pause to compose himself after saying these were "beautiful little kids between the ages of 5 and 10."

As he continued with his statement, Obama wiped away tears from each eye. He has ordered flags flown as half staff.

It is the second worst mass shooting in U.S. history, exceeded only by the Virginia Tech shooting in 2007 when 32 were killed before the shooter turned the gun on himself. The carnage in Connecticut exceeded the 1999 Columbine High School shooting in which 13 died and 24 were injured.

Friday's shooting came three days after masked gunman Jacob Roberts opened fire in a busy Oregon mall, killing two before turning the gun on himself.

The Connecticut shooting occurred at the Sandy Hook Elementary School, which includes 450 students in grades K-4. The town is located about 12 miles east of Danbury, Conn.

The massacre prompted the town of Newtown to lock down all its schools and draw SWAT teams to the school, authorities said.

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Bell tolls for Beijing's Drum Tower homes

BEIJING - China's capital is to destroy swathes of ancient courtyard homes surrounding a 13th-century landmark in what is being called an effort to preserve Beijing's historical legacy, residents said Friday.

Large numbers of hutong homes, some of them dating back to the Qing dynasty, will be demolished around the Drum and Bell Towers -- a tourist hotspot in Beijing's historic centre -- to make way for a large plaza, they said.

Notices for the "destroy and evict" project are plastered throughout the quarter, dated Wednesday and saying the work was due to be completed by February 24.

Besides protecting the historic legacy of the capital, the project is also aimed at restoring and repairing old and dilapidated buildings, the notices said.

Forced evictions are a major source of unrest in China. Ordinary citizens routinely accuse local officials and developers of cashing in on a property boom by clearing away longstanding residents to pave the way for new projects.

Destroying old homes in central Beijing has particular sensitivity. Critics say new development projects rob the capital of its cultural legacy.

"We have been hearing this was going to happen for years, but now that the notices are up there is not much you can do but leave," said souvenir shop seller Ma Yong.

"When I first saw the notices I felt nothing but despair."

Besides having her rented shop torn down, Ma's small home nearby, where she lives with her retired husband, will also be flattened.

Residents must negotiate compensation with the newly set up "destroy and evict" office near the Bell Tower, with compensation beginning at around 40,000 yuan (US$5,800) per square metre.

Between 130 and 500 homes are to be destroyed, state press reports said.

Officials refused to answer questions when approached by AFP.

"A lot of people are opposed to the campaign, 40,000 yuan per square metre is too cheap, especially with the price of housing in Beijing sky-rocketing," said the manager of a coffee shop near the Drum Tower, who gave her surname only as Wang.

"People are already asking for 150,000 yuan per square metre," she said.

Others said they were happy with the compensation.

"We took the money," said Zhou Li, 51, who was to move out to the suburbs with his elderly parents this weekend after living most of his life near the Bell Tower.

- AFP/ir

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Nuke watchdog close to deal with Iran

Iran President Mahmoud Ahmadinejad said at an October press conference that Iran will not back down on its nuclear program.

STORY HIGHLIGHTS

• NEW: IAEA and Iran close to an agreement, nuclear watchdog chief says


• Iran calls the talks "constructive" but does not address access to Parchin


• Prof. Fereydoun Abbasi Davani is among those being slapped with sanctions


• Abbasi Davani, the head of Iran atomic agency, survived a bomb that Iran blamed on Israel

(CNN) -- The head of a U.N. nuclear watchdog group said Friday a deal with Iran over its nuclear program is likely in January, an agreement that will also allow inspectors to gain access to a military complex where Tehran is believed to be testing nuclear materials.

The news followed reports that the International Atomic Energy Agency wrapped one-day talks in Iran over its nuclear program, widely suspected by the United States and other Western nations as a front for the country's development of nuclear weapons -- a charge Iran has repeatedly denied.

"We have agreed to meet again on 16 January next year, where we expect to finalize the structured approach and start implementing it then shortly after that," IAEA chief inspector Herman Nackaerts told reporters after returning to Vienna, Austria.

Read more: CNN Fact Check: Iran and the Bomb

The talks between Iran and the International Atomic Energy Agency (IAEA) were aimed at jump-starting negotiations, while allowing agency inspectors to gain access to a military complex where Tehran is suspected of testing nuclear materials.

Access to the Parchin military complex, just outside Tehran, is a key element in the negotiations.

"We have not been given access to Parchin this time. But as you know access to Parchin is part of the structured approach, and we hope as I said that we will implement that shortly," Nackaerts said.

Read more: U.N. watchdog: Iran makes significant nuclear steps

Iran's liaison to IAEA, Ali Asghar Soltanieh, characterized the talks as constructive, according to state-run news agency IRNA. The report stopped short of saying whether the talks included discussion about investigators getting access to Parchin, which was requested at a meeting in November in Vienna, Austria.

The next round of talks were scheduled for January 16, Soltanieh told IRNA. The IAEA also confirmed the talks would continue on that day.

The United States, meanwhile, slapped new sanctions on Iran on Thursday, targeting a handful of companies and individuals it says are providing materials and technology to Tehran's nuclear program.

The sanctions, announced by the U.S. State and Treasury departments, are the latest to target Iran's economy as well as its ability to develop nuclear material.

Read more: U.N. nuclear agency expresses 'serious concern' about Iran nuke activity

The sanctions were essential "given Iran's continued intransigence on its nuclear program," said Victoria Nuland, the U.S. State Department spokeswoman.

Among the targets of the latest sanctions is Prof. Fereydoun Abbasi Davani, the head of the Iran Atomic Energy Organization.

Abbasi Davani and his wife survived a car bomb two years ago that Tehran has blamed on Israel. At least four scientists associated with Iran's nuclear program have been killed since 2010.

The companies being targeted with sanctions: FaraTech, the Neda Industrial Group, Aria Nikan Marine Industry, Towled Abzar Boreshi, Iran Pouya, Terjerat Gostar and Tarh O Palayesh.

Read more: Inspection at Iran nuclear facility finds higher-level traces of uranium, U.N. says

The sanctions freeze the companies' assets and prohibit business dealings in or with the United States. Companies and banks that defy the U.S. sanctions could be cut off from the U.S. financial system, the State and Treasury departments said.

Iran maintains its nuclear program is for civilian energy purposes only. But the IAEA has said it cannot verify whether the intent of the program is for peaceful means.

A number of Western nations have placed economic and arms-related sanctions on Iran since November 2010 when the IAEA said Tehran was pursuing technology that could be used to build nuclear weapons.

Since then, Iran has been hit by the United States and the European Union with an oil embargo as well as sanctions targeting its banks and number of its businesses.

CNN's Saskya Vandoorne reported from London and Chelsea J. Carter from Atlanta.

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As "fiscal cliff" looms, health reform questions linger

Washington lawmakers this month are squarely focused on deficit reduction as they attempt to scramble off the so-called "fiscal cliff." All the while, however, the government is proceeding with the costly and ambitious rollout of the Affordable Care Act.

Key components of President Obama's health care law won't go into effect for about another year, but federal and state lawmakers are obligated to start building up those health care systems now. Many Republicans, however, argue the Obama administration hasn't said with certainty what the programs will ultimately cost or how they'll be governed. Democrats largely chalk up the complaints to the latest chapter in Republican-led obstruction against the Affordable Care Act, pointing to Democratic-led states that are making progress implementing the law.

The "fiscal cliff," meanwhile -- the series of tax hikes and deep spending cuts set to kick in next year -- has cast a shadow over the entire health care debate. While lawmakers spar over the details of large new health care systems, Congress could be forced in the coming weeks to make spending cuts and policy changes to programs like Medicaid.

At a congressional hearing Thursday on the subject of the health care law, Louisiana's secretary of the Health and Hospitals Department Bruce Greenstein told Congress it felt as if they were operating in a "parallel universe."

"It feels somewhat awkward to be here testifying on the implementation of one of the largest expansions of entitlement programs in nearly 50 years," he said, "at the same time as ongoing discussions about federal spending reductions to avert the 'fiscal cliff' and raising the debt ceiling take place."

In spite of those concerns, states face one deadline today: Deciding whether or not they will establish and operate their own health care exchange system -- a state-based online marketplace where consumers should be able to compare health insurance plans and purchase one. If they don't want to build or operate their own exchanges, they can hand the responsibility to the federal government or enter into a state-federal partnership.

At the same time, state leaders are deciding whether to expand Medicaid, the joint federal-state program currently open to disabled and certain low-income people. The Affordable Care Act calls for states to open up Medicaid to anyone below 138 percent of the poverty line -- the Supreme Court, however, ruled over the summer that the Medicaid expansion shouldn't be mandatory. There's no deadline for states to say whether or not they will expand Medicaid.

Through these two components -- the exchanges and the Medicaid expansion -- roughly 36 million people are predicted to obtain health insurance by 2022.

1/4

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Critics Faulted Rice's Work on Benghazi, Africa

United Nations Ambassador Susan Rice removed herself from possible consideration as secretary of state after becoming yet another player in the divide between the left and right.

Rice, who withdrew her name Thursday, has faced months of criticism over how she characterized the Sept. 11 attack on a U.S. consulate in Benghazi, Libya. She also has come under fire for her approach to dealing with African strongmen.

Rice became a target for conservatives when she went on Sunday morning current affairs shows such as ABC News' "This Week" following the Benghazi attack and failed to characterize it as a pre-meditated act of terror. Instead, she said it was a spontaneous response to an anti-Islam film produced in the United States and cited in the region as an example of anti-Islamicism in the West.

After it became clear that Rice's assertions were untrue and elements of the Obama administration may have known that to be the case, Republican Sens. Lindsey Graham, John McCain and Kelly Ayotte said they would do whatever they could to block Rice's possible nomination to replace Hillary Clinton as secretary of state.

GOP Senators 'Troubled' After Meeting With Ambassador Rice Watch Video

President Obama to Senator McCain: 'Go After Me' Watch Video

Susan Rice: U.S. Not 'Impotent' in Muslim World Watch Video

"This is about the role she played around four dead Americans when it seems to be that the story coming out of the administration -- and she's the point person -- is so disconnected to reality, I don't trust her," Graham said. "And the reason I don't trust her is because I think she knew better. And if she didn't know better, she shouldn't be the voice of America."

Members of the administration defended Rice. At his testimony before Congress, Gen. David Petraeus, the former CIA director, said Rice was speaking from unclassified talking points given to her by the CIA.

Senate Intelligence Committee Chairwoman Dianne Feinstein, D-Calif., reiterated what Petraeus said outside his closed-door hearing before the Senate.

"The key is that they were unclassified talking points at a very early stage. And I don't think she should be pilloried for this. She did what I would have done or anyone else would have done that was going on a weekend show," Feinstein said. "To say that she is unqualified to be secretary of state, I think, is a mistake. And the way it keeps going, it's almost as if the intent is to assassinate her character."

Minutes after she announced her withdrawal from the process, Graham tweeted, "I respect Ambassador Rice's decision."

McCain's office released a paper statement saying, "Senator McCain thanks Ambassador Rice for her service to the country and wishes her well. He will continue to seek all the facts surrounding the attack on our consulate in Benghazi that killed four brave Americans."

Over the last few weeks, criticism of Rice had grown beyond her response to Benghazi to include a closer scrutiny of her work in Africa, where she had influence over U.S. policy during the Clinton administration.

Critics of her Africa dealings were not partisan -- but included human rights workers, journalists and some Africans themselves.

Among the most serious critiques was the accusation that she actively protected Rwandan President Paul Kagame and senior members of his government from being sanctioned for funding and supporting the rebels that caused Eastern Congo's recent violence.

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Search for aliens poses game theory dilemma

SENDING messages into deep space could be the best way for Earthlings to find extraterrestrial intelligence, but it carries a grave risk: alerting hostile aliens to our presence. Game theory may provide a way to navigate this dilemma.

So far the search for extraterrestrial intelligence (SETI) has mostly been restricted to listening for signs of technology elsewhere. Only a few attempts have been made to broadcast messages towards distant stars. Many scientists are against such "active" SETI for fear of revealing our presence. If all aliens feel the same way then no one will be broadcasting, and the chance of detecting each other is limited.

To weigh up the potential losses and gains, Harold de Vladar of the Institute of Science and Technology Austria in Klosterneuburg turned to the prisoner's dilemma, a game-theory problem in which two prisoners choose between admitting their shared crime or keeping quiet, with different sentences depending on what they say. An individual prisoner gets off scot free if they rat on a partner who remains silent, with the silent partner getting a maximum sentence. If they both rat on each other, each gets a medium sentence. By contrast, if both stay silent, both get token sentences - the best overall result.

De Vladar reasoned that the SETI dilemma is essentially the same, but reversed. Mutual silence for prisoners is equivalent to mutual broadcasting for aliens, giving the best results for both civilisations. And while a selfish prisoner rats, a selfish civilisation is silent, waiting for someone else to take the risk of waving "Over here!" at the rest of the universe.

This led de Vladar to apply the mathematics of the prisoner's dilemma to SETI (International Journal of Astrobiology (IJA), doi.org/jx7). In the classic version of the prisoner's dilemma, each selfishly rats on the other. But as we do not know the character of any aliens out there, and as it is difficult to put a value on the benefits to science, culture and technology of finding an advanced civilisation, de Vladar varied the reward of finding aliens and the cost of hostile aliens finding us. The result was a range of optimal broadcasting strategies. "It's not about whether to do it or not, but how often," says de Vladar.

One intriguing insight was that as you scale up the rewards placed on finding aliens, you can scale down the frequency of broadcasts, while keeping the expected benefit to Earthlings the same. Being able to keep broadcasts to a minimum is good news, because they come with costs - rigging our planet with transmitters won't come cheap - and risk catastrophic penalties, such as interstellar war.

Seth Shostak of the SETI Institute in Mountain View, California, says that game theory is a good approach but that there are too many unknowns. Perhaps aliens are not actively broadcasting because they don't need to. Shostak has recently shown that a civilisation even slightly more advanced than ours could use its sun as a "gravitational lens". Such a lens could detect the lights of New York City from up to 500 light years away, once the light has had time to travel that far (IJA, doi.org/jx8). And there are certainly alien star systems that are closer to us than that.

Earth has also been accidently leaking radio and TV signals for the past century, which may have already been picked up. "Any society at least a few centuries beyond the invention of radio will recognise that deliberate transmissions are not the way they will be found," says Shostak. Quick, turn off those lights!

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