Danica Patrick makes NASCAR history

DAYTONA BEACH, Fla. Danica Patrick has made history before — as a woman and a racer, in Indianapolis and Japan.

The spotlight is nothing new. But never has it been this bright before.

Patrick won the Daytona 500 pole Sunday, becoming the first woman to secure the top spot for any race in NASCAR's premier circuit. It's by far the biggest achievement of her stock-car career.

29 Photos

Danica Patrick

"I was brought up to be the fastest driver, not the fastest girl," she said. "That was instilled in me from very young, from the beginning. Then I feel like thriving in those moments, where the pressure's on, has also been a help for me. I also feel like I've been lucky in my career to be with good teams and have good people around me. I don't think any of it would have been possible without that.

"For those reasons, I've been lucky enough to make history, be the first woman to do many things. I really just hope that I don't stop doing that. We have a lot more history to make. We are excited to do it."

Her latest stamp in the history books came with a lap at 196.434 mph around Daytona International Speedway. Patrick went out eighth in the qualifying session, then had to wait about two hours as 37 fellow drivers tried to take her spot.

Only four-time Cup champion Jeff Gordon even came close to knocking her off. Gordon was the only other driver who topped 196 mph in qualifying. He locked up the other guaranteed spot in next week's season-opening Daytona 500.

"It's great to be a part of history with Danica being on the pole," said Gordon, who joked that at least he was the fastest guy. "I think we all know how popular she is, what this will do for our sport. Congratulations to her. Proud to be on there with her."

• Danica Patrick crashes in Daytona qualifier

The rest of the field will be set in duel qualifying races Thursday.

However the lineup unfolds, all drivers will line up behind Patrick's No. 10 Chevrolet SS.

And she knows her latest achievement will mean more public relations work.

The routine is nothing new for Patrick, who was the first woman to lead laps in the Indianapolis 500. She finished third in 2009, the highest finish in that illustrious race for a woman. And she became the only woman to win an IndyCar race when she did it in Japan in 2008.

Hardly anyone witnessed that victory.

Leading the field to the green flag in NASCAR's showcase event should be must-watch television.

"That's a huge accomplishment," team owner and fellow driver Tony Stewart said. "It's not like it's been 15 or 20 years she's been trying to do this. It's her second trip to Daytona here in a Cup car. She's made history in the sport. That's stuff that we're proud of being a part of with her. It's something she should have a huge amount of pride in.

"It's never been done. There's only one person that can be the first to do anything. Doesn't matter how many do it after you do, accomplish that same goal. The first one that does always has that little bit more significance to it because you were the first."

Even before her fast lap Sunday, Patrick was the talk of Speedweeks. Not only did she open up about her budding romance with fellow Sprint Cup rookie Ricky Stenhouse Jr., but she was considered the front-runner for the pole after leading practice sessions Saturday.

And she didn't disappoint.

She kept her car at or near the bottom of the famed track and gained ground on the straightaways, showing lots of power from a Hendrick Motorsports engine.

"It's easy to come down here in your first or second year as a driver and clip the apron trying to run too tight a line or do something and scrub speed off," Stewart said. "That's something she did an awesome job. Watching her lap, she runs so smooth. ... She did her job behind the wheel, for sure."

The result surely felt good for Patrick, especially considering the former IndyCar driver has mostly struggled in three NASCAR seasons. Her best finish in 10 Cup races is 17th, and she has one top-five in 58 starts in the second-tier Nationwide Series.

She raced part-time in 2010 and 2011 while still driving a full IndyCar slate. She switched solely to stock cars last season and finished 10th in the Nationwide standings.

She made the jump to Sprint Cup this season and will battle Stenhouse for Rookie of the Year honors.

Starting out front in an unpredictable, 500-mile race doesn't guarantee any sort of result, but securing the pole will put her in the limelight for at least the rest of the week.

She also won the pole at Daytona for last year's Nationwide race.

This is considerably bigger.

The previous highest female qualifier in a Cup race was Janet Guthrie. She started ninth at Bristol and Talladega in 1977.

"It's obviously a history-making event that will last a long, long time," Guthrie said, praising Patrick's feat. "It's a different era, of course. Different times. I can't imagine what I would do with a spotter or somebody telling me how to drive. It's rather a different sport now. Back then, there was a much greater difference from the front of the field to the back."

Guthrie received a lukewarm reception from fellow drivers back then.

Patrick was much more welcomed, undoubtedly because of her background and popularity.

She's comfortable being in the spotlight, evidenced by her racing career, her television commercials and her sudden openness about her personal life.

"I think when pressure's on and when the spotlight's on, I feel like it ultimately ends up becoming some of my better moments and my better races and better results," Patrick said. "I just understand that if you put the hard work in before you go out there that you can have a little peace and a little peace of mind knowing that you've done everything you can and just let it happen."

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Country Star Mindy McCready Shot Herself, Cops Say

Mindy McCready, the country singer who soared to the top of the charts with her debut album, "Ten Thousand Angels," but struggled with substance abuse, served time in jail and fought a lengthy battle with her mother over custody of her son has died of what appears to be a self-inflicted gunshot wound, police said. She was 37.

Deputies from the Cleburne County Sheriff's Office were dispatched to a report of gun shots fired at McCready's Heber Springs, Ark., home at around 3:30 p.m. today.

There they found McCready on the front porch. She was pronounced dead at the scene from what appeared to be a single self-inflicted gunshot wound, according to a statement from the sheriff's office.

McCready's boyfriend, David Wilson, died in January of a self-inflicted gunshot wound. McCready was ordered to enter rehab shortly after Wilson's death, and her two children, Zander, 6, and 9-month-old Zayne were taken from her. She was released after one day to undergo outpatient care.

McCready scored a number-one Billboard country hit in 1996 with "Guys Do It All the Time," but in recent years, the country crooner has received more media attention for her troubled personal life than her music.

She has been arrested multiple times on drug charges and probation violations and has been hospitalized for overdoses several times, including in 2010, when she was found unconscious at her mother's home after taking a painkiller and muscle relaxant.

Angela Weiss/Getty Images

Her mother, Gayle Inge, was appointed to be her son Zander's legal guardian in 2007 after McCready was arrested for violating probation on a drug-related charge. The boy's father is McCready's ex-boyfriend Billy McKnight.

Following a custody hearing in May 2011, McCready released a statement, saying, "We have progressed in a positive manner to reunite me and my son, Zander. I feel very optimistic this will happen in the near future."

But just six months later, in November 2011, was accused of violating a court order for failing to bring Zander back to her mother in Florida after a visit. The boy was placed in foster care while McCready and her mother worked out the custody dispute.

McCready's struggle with substance abuse was broadcast in 2010 on the third season of "Celebrity Rehab with Dr. Drew."

McCready also claimed to have carried on a decade-long affair with baseball star Roger Clemens that began was she was 15 years old and he was 28. Clemens denied that the relationship was sexual in nature.

"You know what, I don't think I'm ever going to be one of those people that has a normal, quiet existence," McCready told ABC Radio in 2010. "I've been chosen for some reason to be bigger and larger than life in every way. Negative and positive."

McCready, who was born and raised in southern Florida, moved to Nashville when she was 18 to start her music career.

Within a few months, she was starting to work with producer David Malloy, who got her tapes to RLG Records. The company signed her to a contract after seeing her in concert, giving her a record deal less than a year after her arrival in Nashville.

Her debut album, "Ten Thousand Angels," went gold within six months of its release in April 1996, and eventually went multi-platinum. Two more followed: "If I Don't Stay the Night," in 1997; and "I'm Not So Tough" in 1999.

Her most recent album, "I'm Still Here," featuring new versions of her early hits "Ten Thousand Angels" and "Guys Do It All the Time," was released in March 2010.

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False memories prime immune system for future attacks

IN A police line-up, a falsely remembered face is a big problem. But for the body's police force – the immune system – false memories could be a crucial weapon.

When a new bacterium or virus invades the body, the immune system mounts an attack by sending in white blood cells called T-cells that are tailored to the molecular structure of that invader. Defeating the infection can take several weeks. However, once victorious, some T-cells stick around, turning into memory cells that remember the invader, reducing the time taken to kill it the next time it turns up.

Conventional thinking has it that memory cells for a particular microbe only form in response to an infection. "The dogma is that you need to be exposed," says Mark Davis of Stanford University in California, but now he and his colleagues have shown that this is not always the case.

The team took 26 samples from the Stanford Blood Center. All 26 people had been screened for diseases and had never been infected with HIV, herpes simplex virus or cytomegalovirus. Despite this, Davis's team found that all the samples contained T-cells tailored to these viruses, and an average of 50 per cent of these cells were memory cells.

The idea that T-cells don't need to be exposed to the pathogen "is paradigm shifting," says Philip Ashton-Rickardt of Imperial College London, who was not involved in the study. "Not only do they have capacity to remember, they seem to have seen a virus when they haven't."

So how are these false memories created? To a T-cell, each virus is "just a collection of peptides", says Davis. And so different microbes could have structures that are similar enough to confuse the T-cells.

To test this idea, the researchers vaccinated two people with an H1N1 strain of influenza and found that this also stimulated the T-cells to react to two bacteria with a similar peptide structure. Exposing the samples from the blood bank to peptide sequences from certain gut and soil bacteria and a species of ocean algae resulted in an immune response to HIV (Immunology, doi.org/kgg).

The finding could explain why vaccinating children against measles seems to improve mortality rates from other diseases. It also raises the possibility of creating a database of cross-reactive microbes to find new vaccination strategies. "We need to start exploring case by case," says Davis.

"You could find innocuous pathogens that are good at vaccinating against nasty ones," says Ashton-Rickardt. The idea of cross-reactivity is as old as immunology, he says. But he is excited about the potential for finding unexpected correlations. "Who could have predicted that HIV was related to an ocean algae?" he says. "No one's going to make that up!"

This article appeared in print under the headline "False memories prime our defences"

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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Briton survived Outback by drinking contact lens fluid

SYDNEY: A British backpacker who endured three days missing in Australia's punishing Outback survived by drinking his contact lens fluid and urine, his mother said Sunday.

Samuel Woodhead, 18, was found Friday on the sprawling remote property Upshot Station, about 130 kilometres (80 miles) from the far-flung central Queensland town of Longreach, from where he had set off on Tuesday.

He became lost in extremely harsh terrain and mother Claire Derry credited his training at the Royal Military Academy Sandhurst for his survival in the remote and unforgiving Outback with little more than sunburn and dehydration.

"He tried drinking his own urine and he wasn't able to cope much with that, so he drank tiny sips of the contact lens fluid," Derry told the Sun-Herald newspaper.

He lost 15 kilograms over three days and nights and Derry said she and her son were both incredulous that he'd been found alive.

"Sam is incredibly fit, that was something I clung on to," she said, adding that her son wanted to go into the Royal Marines or the army.

"He'd not long ago been on an appropriateness course for Sandhurst... so I knew he had a lot of knowledge to draw on."

Australian authorities had held grave fears for the man's survival in a region where heat, a lack of water, venomous snakes and the possibility of injury could prove deadly.

Planes, motorbikes, and four-wheel drives were being used in the search, with neighbours also combing the area on foot and horseback and an emergency services helicopter dispatched with medical staff.

When he was found Derry said her son told her his rescuers said "they normally find people out here with their eyes pecked out.

"All he could say was 'Mum, just thank these wonderful people. I've loved Australia from the minute I arrived here. These people are extraordinary'."

Derry was on board a flight from Britain to Australia and had been fearing the worst when she learned that her son had been found alive. She celebrated by embracing the flight crew and popping some champagne.

"One of the airline staff came up to me and he was smiling. He handed me this piece of paper saying Sam was found alive and well," she said.

- AFP/ir

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Internet rules: More cats. LESS CAPS

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

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STORY HIGHLIGHTS

• Yes, there ARE some rules to the Internet, though, for now they're mainly an inside joke


• Some rules based on pop culture, some have become Web memes


• Other rules ominously quote Anonymous


• Is there a need for rules on the vast and wild Web? Depends on where you stand

Editor's note: In the gallery above, we've selected a handful of our favorite Internet rules, or truths. (You might recognize a few.) What are some of yours? Tell us in the comments. We'll feature some of the best on CNN.

(CNN) -- Hello!

Welcome to the Internet. It's a big place, so let me show you around.

You're approaching Oversharing Pass, where residents routinely post too much information. The Facebook Gorge and Twitter Triangle are particularly nefarious time-sucks. Restraint is advised.

Up ahead is Hyperbole Junction, which is the Worst. Spot. Ever. We recommend that you maintain an even keel and stay to the center; the extreme left and right can be dangerous.

And over there is the infamous Lair of Sociopaths, the home of trolls and loners who mercilessly mock everyone who enters their territory. Watch your step: They may trip you up and you'll fall into the Chasm of Lulz.

Our world isn't all dangerous, of course. You may visit Squee City, where images of cute cats and laughing babies fill the landscape. You'll also meet countless kind strangers, hilarious raconteurs and hard-working fact-checkers. They make it all worthwhile.

Hmm. Maybe it would be easier if you had a guide -- you know, some rules to help you find your way.

What, you didn't know there are rules of the Internet?

Of course there are rules. How do you think we maintain order around here?

A parody of rules

That's a joke.

But there really are some rules of the Internet -- even if they, too, began as kind of a joke.

According to the site KnowYourMeme.com, the Rules began around 2006 as a guide for the Internet collective Anonymous and emerged on the old Encyclopedia Dramatica, a bawdy meme catalog. Soon a version emerged on 4chan, an online bulletin board where most users post anonymously, says Jamie Cohen, director of web/digital media at Hofstra University's School of Communication.

"Chris Poole (4chan's founder) kind of designed it, kind of like a Netiquette rules," he says, describing the unspoken code of conduct that lubricates Internet discourse. (Poole has attributed the rules to Gaia Online, a role-playing community.)

But the rules of the Internet deliberately mocked many of those conventions. The self-reflexive parody fit perfectly with its community's attitude, points out Anthony Rotolo, a professor at Syracuse University's School of Information Studies.

"These jokes are meant to comment on something happening in the world," he says. "Later they get accepted as truisms or become a meme."

The absurdity has been reflected even in the supposed number of rules. Though the best-known first version claimed there were 50 rules, only 18 were listed. Number 1 was initially "Do not talk about Rules 2-33"; no Rules 2-33 were on the list.

The sarcastic attitude was reinforced by the kicker found on Encyclopedia Dramatica. It was a parody of Wikipedia's stub language: "This article is crap. You can help by completely re-writing it."

'Fight Club' and Monty Python

Very quickly, the lists started multiplying and expanding, liberally borrowing from comedy, Web culture and math-science tropes. On one list, a few were designated by complex numbers and mathematical symbols. Some were observations; others were directives.

Some have traced the Internet rules to Chris Poole, the founder of 4chan.

Two rules were taken from "Fight Club": "You do not talk about 4chan (or "/b/," 4chan's random, free-wheeling bulletin board) and "You DO NOT talk about 4chan." One version of Rule 6 stated "There is no Rule 6," which is from a Monty Python sketch. Rule 42, "Always bring a towel," was drawn from Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series. (If you have to ask, read the books.) "Profit," Rule 49, came from "South Park."

Other rules went the reverse direction and became part of mainstream culture. Rule 34 -- "If it exists, there is porn of it" -- is likely the most famous. But there's also "Pics or it didn't happen" (Rule 30), "For every given male character, there is a female version of that character; conversely for every given female character, there is a male version of that character" (Rule 63) and, of course, the corollary to Rule 34 -- "If no porn of it exists at the moment, it will be made" (Rule 35).

Most retained a sense of humor, riffing off established rules and occasionally ending with a giggly "No exceptions."

But a handful were, and remain, as serious as a judge -- notably the three directly about Anonymous (commonly Rules 3-5):

- We are Anonymous.

- We are legion.

- We do not forgive, we do not forget.

The overall Internet rules may have started as a joke, but such ominous language from Anonymous speaks to some of the paradoxes of the Web:

Rules? Why do we need some stinkin' rules?

After all, rules can be helpful -- or divisive. They can create community -- or subvert it.

Even Anonymous, the activist group itself, cuts both ways, says Rotolo. When it hacked the extremist Westboro Baptist Church, many people cheered. But when it goes after less unpopular targets, some cry vigilantism.

Cohen says that the rules themselves try to have it both ways. They're funny until someone gets hurt.

They "play more of a game type of role. They can be bent or broken or cheated or moved around, as you would in any game that has no physical reaction," he says. "That doesn't take into account ever the result of real people being affected by this -- such as teenagers, children, anybody who's seeing things that they shouldn't."

He adds, "There's a lot of rules in there that work for (the creators) more than anyone else. Until they become victims of their own thing, they don't know how powerful the rules are."

Evolving from the Wild West

Of course, the Internet isn't that old, and we're still in its Wild West era in many ways. As the technology evolves from a handful of hackers on Usenet bulletin boards to billions of users on officially sponsored sites, the customs -- the rules -- of the Web will evolve with it.

But we're not talking about the kinds of changes that your family makes to the rules of Monopoly (no, Free Parking is NOT for the pool of money acquired via Chance and Community Chest). We're talking something more expansive: All the established customs of our carbon-based life forms, making way for the instantaneous and virtual modes of silicon-based electronics.

Who knows what new rules may be written?

"When you're in the midst of social change, it's impossible to determine where it's going," says Peter S. Vogel, a former programmer who's now a Dallas-based attorney. "And I think we are in the greatest social change in the history of humans, because there are no boundaries of geography or time."

We haven't even sorted out what happens when the differences in local culture meet global technology. Bruce Umbaugh, a philosophy professor at Webster University in St. Louis who teaches a course on philosophy and technology, argues that not all parts of the world are as tolerant or open-minded as Western democracies.

There's a lot of rules in there that work for (the creators) more than anyone else.
Jamie Cohen, Hofstra University

"There are a lot of other places in the world that are actively using the technology of the Internet to control the free communication among citizens, and to identify critics of the government and hurt them," he says. "We need to be mindful in what we advocate from our perspective that the tools that are implemented on the Net are tools for the global Net."

In other words, citizens of other countries already face actual, enforceable rules -- unlike the folkways established by Web users in the West. Witness the frictions of the Arab Spring, or the restrictions of societies such as North Korea.

It's the kind of perspective that provides a different context for the issues raised by a libertarian, anything-goes Internet. It's hard enough to stop "Star Wars" comment boards from devolving into flamebaiting, meme-generating files of NSFW Yodas.

So for now, we're still making our way through the Series of Tubes, and nobody knows where the boundaries lie. We joke, we grimace and we marvel at the creativity of the hive mind. The Internet is a big place, and countless cultures have set up residence. Eventually, what is now humor may lose its zing; what are now customs may become laws.

Will the rules ever become The Rules? Maybe some future generation will figure out the true guideposts of Internet life, and the singularity will be upon us.

Nah. It'll never happen.

What did we miss? Share your rules for the internet below in the comments. We'll feature some of the best on CNN.

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Dozens of pro-Dorner protesters rally at LAPD HQ

LOS ANGELES Dozens of protesters rallied outside Los Angeles police headquarters Saturday in support of Christopher Dorner, the former LAPD officer and suspected killer of four who died after a shootout and fire this week at a mountain cabin following one of the biggest manhunts in recent memory.

Protesters told the Los Angeles Times they didn't support Dorner's deadly methods, but objected to police corruption and brutality, and believed Dorner's claims of racism and unfair treatment by the department. Many said they were angered by the conduct of the manhunt that led to Dorner's death and injuries to innocent bystanders who were mistaken for him.

Play Video

New details of Dorner's final hours

Michael Nam, 30, who held a sign with a flaming tombstone and the inscription "RIP Habeas Corpus," said it was "pretty obvious" police had no intention of bringing Dorner in alive.

"They were the judge, the jury and the executioner," Nam said. "As an American citizen, you have the right to a trial and due process by law."

During the hunt for Dorner, LAPD Chief Charlie Beck called for Dorner's surrender and said he didn't want to see the suspect or anyone else injured.

Dorner was already believed to have killed three people when he was cornered Tuesday at the cabin near Big Bear Lake, and during the standoff shot and killed a San Bernardino County sheriff's deputy, authorities said.

Play Video

Reporter records gunfight in Dorner capture effort

Only after calls for surrender and use of milder tear gas did deputies launch pyrotechnic gas canisters into the cabin, and the subsequent fire was not intentional, the Sheriff's Department said.

Dorner died of a self-inflicted gunshot wound at the end of the standoff, sheriff's officials said.

The 33-year-old has already inspired a burgeoning subculture of followers. While most don't condone killing, they see him as an outlaw hero who raged against powerful forces of authority, and some even question whether he really died.

Tributes include a ballad titled "El Matapolicias," or "The Police Killer," penned by a Mexican crooner with lyrics paying homage to Dorner, and a YouTube clip showing excerpts from a video game titled "Christopher Dorner's Last Stand Survival Game" whose opening frame declares him "A True American Hero."

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Meteor Blast Creates Rush to Cash In

The shattered glass and broken walls caused by the massive explosion of a monstrous meteor over this remote, industrial Russian city is not even cleaned up, and people are already trying to cash in.

Some residents want to turn this city known mostly for its tank factory into a tourist destination, while others from all around the world are determined to find fragments of the meteorite.

Meteor hunters say it's a once in a lifetime opportunity. A small piece of the space rock that exploded over Russia Friday could be worth thousands of dollars, and bigger chunks could fetch hundreds of thousands.

SEE PHOTOS: Meteorite Crashes in Russia

"I haven't been able to sleep for the last two days because of this," said Michael Farmer, who runs the website Meteor Hunter. "This is a once in a lifetime event. We've never seen anything like this in the last hundred years."

He said he started planning a trip to Chelyabinsk as soon as the meteorite exploded.

"The next morning I was on the phone working on visas. I'd like to get a visa and get over to Russia as quickly as possible," he said. "When this type of thing happens, you know hours count so we try to arrange that as fast as possible."

A day after a massive meteor exploded over this city in central Russia, a monumental cleanup effort is under way.

Authorities have deployed around 24,000 troops and emergencies responders to help in the effort.

Officials say more than a million square feet of windows -- the size of about 20 football fields -- were shattered by the shockwave from the meteor's blast. Around 4,000 buildings in the area were damaged.

Nasha gazeta, www.ng.kz/AP Photo

The injury toll climbed steadily on Friday. Authorities said today it now stands at more than 1,200. Most of those injuries were from broken glass, and only a few hundred required hospitalization.

According to NASA, this was the biggest meteor to hit Earth in more than a century. Preliminary figures suggest it was 50 feet wide and weighed more than the Eiffel Tower.

NASA scientists have also estimated the force of the blast that occurred when the meteor fractured upon entering Earth's atmosphere was approximately 470 kilotons -- the equivalent of about 30 Hiroshima bombs, but it did not cause major damage because it occurred so high in the atmosphere.

"This was caused by a small asteroid, about 15 meters in diameter, coming in at around 18 kilometers per second, that's in excess of 40-thousand miles per hour," NASA planetary scientist Paul Abell said. "As the asteroid comes in, it interacts with the atmosphere and effectively it converts all the energy, the kinetic energy of the asteroid, the mass of the asteroid and the velocity and it's actually that velocity, the asteroid just effectively explodes and that creates the pressure wave, the blast wave that comes down."

Treasure hunters hoping to cash in on the bits of space rock aren't the only ones eager to find pieces of the meteor, Abell said. Scientists say the material could offer valuable information.

"One of the things we'd like to learn is first of all, what was the composition of the asteroid, where did it come from," he said. "We know it came from the asteroid belt but can we link it to a bigger asteroid and also, get an idea of the dispersal pattern."

Residents said they still can't believe it happened here.

"It was something we only saw in the movies," one university student said. "We never thought we would see it ourselves."

Throughout the city, the streets are littered with broken glass. Local officials have announced an ambitious pledge to replace all the broken windows within a week. In the early morning hours, however, workers could still be heard drilling new windows into place.

Authorities have sent divers into a frozen lake outside the city, where a large chunk of the meteor is believed to have landed, creating a large hole in the ice. By the end of the day they had not found anything.

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False memories prime immune system for future attacks

IN A police line-up, a falsely remembered face is a big problem. But for the body's police force – the immune system – false memories could be a crucial weapon.

When a new bacterium or virus invades the body, the immune system mounts an attack by sending in white blood cells called T-cells that are tailored to the molecular structure of that invader. Defeating the infection can take several weeks. However, once victorious, some T-cells stick around, turning into memory cells that remember the invader, reducing the time taken to kill it the next time it turns up.

Conventional thinking has it that memory cells for a particular microbe only form in response to an infection. "The dogma is that you need to be exposed," says Mark Davis of Stanford University in California, but now he and his colleagues have shown that this is not always the case.

The team took 26 samples from the Stanford Blood Center. All 26 people had been screened for diseases and had never been infected with HIV, herpes simplex virus or cytomegalovirus. Despite this, Davis's team found that all the samples contained T-cells tailored to these viruses, and an average of 50 per cent of these cells were memory cells.

The idea that T-cells don't need to be exposed to the pathogen "is paradigm shifting," says Philip Ashton-Rickardt of Imperial College London, who was not involved in the study. "Not only do they have capacity to remember, they seem to have seen a virus when they haven't."

So how are these false memories created? To a T-cell, each virus is "just a collection of peptides", says Davis. And so different microbes could have structures that are similar enough to confuse the T-cells.

To test this idea, the researchers vaccinated two people with an H1N1 strain of influenza and found that this also stimulated the T-cells to react to two bacteria with a similar peptide structure. Exposing the samples from the blood bank to peptide sequences from certain gut and soil bacteria and a species of ocean algae resulted in an immune response to HIV (Immunology, doi.org/kgg).

The finding could explain why vaccinating children against measles seems to improve mortality rates from other diseases. It also raises the possibility of creating a database of cross-reactive microbes to find new vaccination strategies. "We need to start exploring case by case," says Davis.

"You could find innocuous pathogens that are good at vaccinating against nasty ones," says Ashton-Rickardt. The idea of cross-reactivity is as old as immunology, he says. But he is excited about the potential for finding unexpected correlations. "Who could have predicted that HIV was related to an ocean algae?" he says. "No one's going to make that up!"

This article appeared in print under the headline "False memories prime our defences"

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.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

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Anti-North Korea leaflets launched on Kim's birthday

IMJINGAK, South Korea: North Korean defectors in the South launched 200,000 anti-Pyongyang leaflets across the tense inter-Korean border on Saturday, the birth anniversary of the North's late leader Kim Jong-Il.

The defectors used gas-filled balloons to float the leaflets along with $1 currency notes across the western border town of Imjingak, despite high tensions owing to the North's third nuclear test on Tuesday.

The balloons were inscribed with slogans such as "Stop provocative acts with missiles and nuclear tests", "North Koreans rise up" and "The Kim dynasty will soon collapse".

North Korea celebrates the birthdays of both late leaders -- Kim Jong-Il's on February 16 and his father Kim Il-Sung's on April 15 -- as major national holidays.

Kim Jong-Il, who died of heart attack in December 2011, was succeeded by his son Jong-Un.

Anti-Pyongyang activists momentarily suspended such leaflet launches until after the South's presidential election in December as the government urged them to halt such activities for fear of provoking Pyongyang.

North Korea has in the past threatened "merciless military strike" in response to anti-regime propaganda leaflets, with local residents warned to evacuate such areas.

The North conducted a third nuclear test on Tuesday, whose detonation power was much larger than those of two previous ones in 2006 and 2009.

Pyongyang said the test was a riposte to UN sanctions imposed after its launch of a long-range rocket in December, which it claimed was part of a legitimate space programme.

- AFP/ck

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