In this task, you are given news articles and you need to generate a highlight, i.e., a short summary, with a maximum length of 10 lines.

Call them drones; call them toy airplanes with digital cameras dropped into their girths. Either way, South Korean defense officials said on Friday they were sure that they came from North Korea and that they were up to no good. Three diminutive single-engine unmanned propeller planes that look like they could have come from a hobby shop were found on the ground in March and April in parts of the South near the border with the northern Communist regime. Though the low-tech buzzers don't seem to represent a major danger, they come in the shadow of North Korean missile launches and the impending countdown to the test of a nuclear device. And they made it through South Korean air defenses. Ministry of National Defense officials in Seoul immediately suspected that the sky-blue colored fliers belonged to Pyongyang. They formed an investigation team with the United States in mid-April to analyze the "travel log file" and photos taken by the drones and announced the results on Friday. Scientists found a "smoking gun that all three were sent from North Korea and are programmed to return to North Korea," South Korean defense spokesman Kim Min-soek said. Photos the drones took along on their journey corroborate their flight path, he said. Precarious cargo . Had the mechanical carrier pigeons made it back home, they would have delivered precarious cargo, but it would have been far from precious. Japanese-made digital cameras, which look like they could be of the consumer variety, were inserted into the bellies of the drones and had taken aerial photos of the South from around the border region. All three were programmed to fly over military facilities, and two of them had images of targets of military interest -- strategically important islands near the demilitarized zone, and the Blue House, residence and office of South Korea's President Park Geun-hye. Images from the third drone were not available to South Korean investigators. A wild ginseng digger had stumbled upon the plane and had deleted its memory card so he could use it himself, the Korea Times reported. The planes were not capable of transmitting images back to North Korea in real time, and the photos themselves were no better than what one might see on a service akin to Google Earth, Kim said in a previous briefing. Limited capabilities . There is little danger the drones could have made it far into South Korea. The type of drone is not used for long-range missions, a defense analyst said. Instead they're better suited to see what the enemy is up to on the other side of a hill or wall. "It has quite a small range, it doesn't have very long endurance so it would only be up there for a few hours. You would use those to see what the other guys are doing in a battlefield environment," said James Hardy, the Asia Pacific editor of IHS Jane's Defence Weekly magazine. "They're very much closely built off a remote-controlled aircraft that you can buy in a toy store. They're just a militarized version of that," Hardy said. The Korean drones are nowhere near as sophisticated as those used by the United States in Pakistan, Yemen and Afghanistan, he said. They would also not make much of a weapon, if someone decided to stuff explosives into them, Kim has said. "Even if they are to be used for future attacks, (they) can only carry 2-3 kilograms of TNT and cannot cause huge damage." North Korea has flaunted similar, larger UAVs at military parades in recent years, and some of them have been spiked with explosives, Hardy said. Video footage shows North Korean exercises using them as missiles, but it's an expensive way to build a bomb, he said. And it could only take out a single vehicle or ship. 'Tis the season . Spring is traditionally a time of high tensions between Pyongyang on the one side and Seoul and Washington on the other. Annual U.S.-South Korean joint military drills, that ended on April 7, drew criticism from North Korea, which views the exercises as "dress rehearsals for invasion," according to analyst James Person from the Woodrow Wilson Center. In March, Pyongyang fired two mid-range ballistics missiles off its eastern coast, in an apparent response to the drills. Days later, the two sides fired hundreds of shells across the Northern Limit Line, their disputed maritime border. The shells were shot into the sea, not at hard targets. North Korea also warned it was preparing to test another nuclear device. "It's all good stuff because it allows the North Koreans to do something provocative and slightly annoying which might embarrass South Koreans, but it's not provocative enough to create a proper military response," Hardy said. Slipping through . The drones would fit well into that category, since they slipped through South Korean air defenses. They are made of polycarbonate, which is difficult to detect with radar, according to South Korea's Yonhap news agency. They fly at an average speed of about 110 km per hour (68 mph) at an altitude of 1.3 km (.8 miles). They were launched in North Korea from three locations, South Korea's defense ministry said: Near the Kaesong area, 27 kilometers southeast of Haeju and 17 kilometers from Pyonggak. South Korea's defense ministry called the intrusion by the drones a violation of the truce that ended the bloody conflict between North and South Korea in 1953. Kim said Seoul will send a warning via the United Nations to Pyongyang and tighten air defenses as a response to the drones.
Three diminutive single-engine unmanned propeller planes were found in March and April .
They look like hobby shop model airplanes with consumer cameras shoved into them .
They don't have strong military or spy capabilities, but they made it through air defenses .
Spring is typically a time of high provocations between North and South Korea .

(CNN) -- You've been thinking about it for weeks. Mounds of turkey piled high with buttery mashed potatoes, dripping with gravy. Green bean casserole and pumpkin pie. Or sweet potato casserole and pecan pie. Cranberries. Collard greens. Stuffing. Every year, we spend hours making the traditional Thanksgiving favorites just like our mom used to do, like her mom did before that. "When you do something repeatedly over the years, it builds up a kind of power," nutritional psychologist Marc David says. "It creates its own momentum. To make the same dish year after year, decade after decade, there's something in that that connects us to the past." Nostalgia comes from the Greek word for homecoming (nostos) and pain (algos). But experts say feeling nostalgic is actually good for your mental health. Anything can bring on that special moment -- music, smells, photos. We play the same songs, cook the same recipes, take the same family photo in the same spot next to the same fireplace because we're human, David says. Our biological functions are based on repetitive rhythms. Our brains are hardwired to relax when surrounded by the familiar. "Emotional eating has gotten a bad name," David says. "We're emotional people. We are emotional beings. We're built for pleasure." Nostalgic products fill a need to belong and feel socially connected, according to an Arizona State University study published in the Journal of Consumer Research last year. That's why this time of year, TV and radio ads are filled with smiling families sitting around a large table in holiday sweaters, passing the dinner rolls. Even if you're far away from home, companies want you to believe that buying those same dinner rolls will fill your heart with holiday joy. Turns out, it works. Dr. Clay Routledge works with other researchers from the University of Southampton's nostalgia project. He recently published an article in the Journal of Personality and Social Psychology titled "The past makes present meaningful." Nostalgia, Routledge found, increases a person's self-esteem. Daily activities like going to class or attending meetings are routine, even boring. When we engage in nostalgia, we tend to think of the things that are really important to us. That makes us feel like our life is meaningful. Taste of Home's sweet potato tart recipe . "What's amazing about autobiographical memory is that bad memories fade faster than positive memories," Routledge says. "One thing that's interesting about nostalgia is that it's not 100% detail accurate -- it's more the highlights." Nostalgia is largely social. Routledge' s studies found that people who are alone or disconnected feel better after engaging in nostalgia. Yet you're probably dreaming right now about your grandfather's deep-fried turkey, not about him, right? "Is it really about the food?" Routledge asks. "Or is the food just sort of a trigger or cue for what the holidays are really all about, which is relationships. We don't eat these foods other times of the year because we've segmented them off as special. They go with this occasion. They go with the relationships." For Taste of Home editor Catherine Cassidy, Thanksgiving means cooking for the ones she loves. She gets satisfaction in putting good food on the table for her family. So many of our best moments from the past, she says, are rooted in our sense of smell. "We call them food memories. When it comes to the holidays we are always trying to recreate the magic and the specialness we experienced when we were children." So indulge in a little Thanksgiving daydream. Long for the oyster stuffing. Sniff the air in anticipation of mom's pumpkin pie. Then on the big day, enjoy your holiday feast, and all the benefits that come from the power of nostalgia.
Nostalgia comes from the Greek word for homecoming (nostos) and pain (algos)
Nostalgic products fill a need to belong and feel socially connected .
People who are alone or disconnected feel better after engaging in nostalgia .

Erie, Pennsylvania (CNN) -- The image remains chilling nearly eight years later: a pizza deliveryman sitting cross-legged on the pavement with a homemade bomb clamped around his neck, surrounded by nervous police who crouch behind their cars. "Why isn't anybody trying to get this thing off me?" he shouts to the dozens of officers nearby. But before a bomb squad can arrive, the device goes off, killing 46-year-old Brian Wells. In the agonizing minutes before his death on August 28, 2003, Wells told police the bomb had been fastened to his body by people who ordered him to rob a bank and follow a detailed checklist before it would be disarmed -- instructions that amounted to a twisted scavenger hunt. Timeline, evidence photos, video, 911 audio . The case fueled years of debate about whether the hapless Wells had been the victim of a heinous murder or a willing participant in a horrifically botched crime. The FBI later concluded that Wells had been a participant and closed the books on the case in March. Two people that agents identified as having been part of the scheme are in prison; a third has died. But Wells' family still believes he was a blameless victim -- "innocent 100 percent," his sister, Jean Heid, told CNN. "They screwed up big time," Heid said. "They let an innocent man, my brother, die while in their custody and they didn't even lift a finger to help him. "This case is going to be looked at for years to come, and they don't want it known that they screwed up," she said. "Brian never would have done this." In particular, she said, one of the plotters escaped justice. According to the FBI, Floyd Stockton knew of the robbery, but received immunity from prosecution and was allowed to go free. Prosecutors never called him as a witness in the trials, saying he was ill at the time. The FBI believes a Stockton associate, William Rothstein, was the mastermind of the heist and likely made the bomb, the affidavit says. Bombmaking materials were found in Rothstein's home. According to the FBI affidavit, one of the admitted conspirators said Stockton carried the bomb out of Rothstein's garage on the day of the robbery and handed it to Rothstein. Read the entire FBI affidavit warrant . Rothstein then secured the bomb around Wells' neck and followed him to the PNC Bank branch that Wells robbed shortly before his death, the affidavit states, quoting a witness who talked to Rothstein's girlfriend, Marjorie Diehl-Armstrong. Stockton is a registered sex offender who was a fugitive from a rape charge in Washington state at the time the plot unfolded and was staying with Rothstein at the time, according to court papers. According to Kenneth Barnes, a convicted crack dealer who is now serving a 20-year prison term in the bomb plot, Stockton was to have divvied up the money from the bank heist. Stockton has rebuffed repeated requests for comment from CNN, both by telephone and in person. Barnes also gave the FBI information that implicated Wells. According to an FBI agent's court affidavit, Barnes told authorities that Wells had been discussing the hold up about a month before it took place. Barnes' story had been corroborated by another witness in the affidavit. By all accounts, the 2003 case evolved into one of the most complicated and bizarre crimes in the annals of the FBI. Police investigating fake collar bomb extortion plot . Half an hour before the bomb went off, Wells had walked into the PNC branch on Peach Street in Erie. The bomb sat on his chest beneath a white T-shirt, which had the word "Guess" spray-painted on it. And he carried a cane, which turned out to be a homemade shotgun. Wells handed over a series of notes to the tellers, demanding $250,000. Tellers didn't have nearly that much in cash, and Wells walked out with a little less than $9,000. Police caught up with him in the parking lot of a nearby eyeglass shop, where he died begging for help. Because it was a bank robbery, the FBI became the lead investigative agency. Agents quickly assembled a task force of more than 50 law enforcement officers from a half-dozen federal, state and local agencies. At first, the FBI saw Wells as a victim. Rich Schapiro, a writer for Wired magazine, has reported extensively on the case and told CNN that the notes Wells carried led him to believe he could live. "The note suggested at the very end of this, if he completed it in the allotted time -- which wasn't much -- that he would be able to save his life," Schapiro said. One federal law enforcement official says the cast of characters ultimately linked to the crime is "like a band of criminal misfits." According to the FBI, those misfits began to turn on each other less than a month after Wells died. On September 21, Rothstein called Pennsylvania State Police to report that there was a body in his freezer -- the body of a man named James Roden, whom he said was killed because he was going to report the bomb plot to authorities, according to the FBI affidavit. Rothstein told FBI agents that Roden had been killed by Diehl-Armstrong and that he had helped Diehl-Armstrong hide the body. After her arrest, Diehl-Armstrong implicated Rothstein in the bomb plot, and she eventually told investigators she gunned down Roden when he threatened to go to police about the plan. Rothstein died of cancer before being officially linked to the crime. Diehl-Armstrong is now serving prison terms both for the botched heist and for Roden's killing. Her own lawyer says she has multiple personality disorders and sometimes has "difficulty" telling the truth. 'Pizza bomber' conspirator gets life behind bars . Barnes, meanwhile, saw his 45-year sentence for the bomb plot reduced to 20 years because he cooperated with authorities. And Stockton now lives in Bellingham, Washington, north of Seattle. He's the one Wells' sister wants brought to justice. "He didn't deserve immunity, "Heid said. "He's the guilty one that killed my brother. He deserved to be brought to justice." Prosecutors said Wells may have been duped into thinking the bomb was a fake before agreeing to take part in the holdup -- but they're confident he was part of the plot from the beginning. "No one could have sat through this trial without understanding the degree of evidence linking Mr. Wells to these participants," Assistant U.S. Attorney Marshall Piccinini, who led the government's case, told reporters. And Jim Fisher, a retired FBI agent and writer, told CNN that he believes Wells was murdered as part of the plot. "It was a first-degree murder," Fisher said. "This was an intentional, pre-meditated homicide. Moreover, it was extremely cruel in the way the crime was executed." CNN's Blake Luce and Curt Merrill contributed to this report.

Case of bomb-wearing bank robber pizza delivery man occurred in 2003 .
Man who allegedly knew about the bomb and the robbery was allowed to go free .
Erie, Pennsylvania, case one of the most bizarre bank robberies in FBI history .
Two people were convicted in the robbery; FBI closed the case this year .