To solve a mystery. How did a large passenger plane, 239 people onboard, simply vanish . At this hour, investigators working in a race against time to find any clue. Why was there no s. O. S. . One minute, a plane tracked by radar on this route. And then, at this point, right there, it was simply gone. And tonight, its a daunting task for the search teams, finding any scrap of debris on two sides of land, an area roughly the size of california and growing by the hour. Abcs bob woodruff is on the ground in beijing, tonight, on the dramatic disappearance. Reporter the plane has simply vanished. Today, in the waters of the south china sea, the search zone was expanded. But no clues. 34 helicopters and planes, along with 40 ships, including submarines. Even sites that monitor Nuclear Weapons have been asked if they saw an explosion the night the plane disappeared. While on land, agony and demands for answers from the families of the 227 passengers and 12 crew, including 3 americans, a father and businessman from texas, and 2 small children. Flying from malaysia to beijing, china, it all began one hour in, during the safest part of the flight. The night sky was clear. Planes Safety Record excellent. Veteran pilot. When, the plane disappears. Officials, today, are saying an oil slick that they tested was not from this flight. Nor was a yellow object floating in the sea. How could this be . The flight was tracked by radar, as it soared out into the ocean. But that commercial radar only reaches about 250 miles into the sea. Malaysian military radar may have picked up the plane, saying it might have turned back. But tonight, that is not clear. Why hasnt the plane been found . The search zone is massive. So, if the plane left its route, just turning a little to the left or right, the search zone expands by hundreds, if not a thousand miles. The plane does have black boxes that ping out a noise. And the waters are shallow, 165 feet deep. But submarines and special ships need to be within five to ten miles to hear it. Today, investigators searched for clues on the two passengers who boarded using stolen passports. Those two passengers bought their tickets at the same time, at this travel agency. Suspicious but few answers. The key, tonight, is why was there not a distress call . The pilots would have had the ability to call in by radio. But they did not. Was there just an instant catastrophe, which means they just didnt have enough time . All of that is still a mystery. Diane . Thank you, bob, reporting in from beijing for us tonight. And as bob said, we turn to two, big possibilities. Was there terrorism or a problem on the plane . Whether structural or pilot error . We have two reports, next, starting with abc senior justice correspondent, pierre thomas, questioning his sources about terrorism. Pierre . Reporter tonight, the fbi is urgently trying to find out why those imposters, one posing as this italian man, used stolen passports to get on Malaysia Airlines flight 370. Sources tell abc news, the fbi is planning to compare fingerprints and those at the airport to those of known terrorists. The fingerprints and stolen passports represent tantalizing clues. But investigators point out the stolen passports does not necessarily indicate terrorism. They are often used by drug smugglers and other criminals. Theres at least 40,000 stolen passports every year. It leaves us very vulnerable, not just to terrorist attacks. But also, it facilitates other criminal activity. Reporter police in thailand are questioning the owners of these travel agencies, which sold the oneway tickets used by the imposters. Abc news has learned they were purchased at the same time by an iranian man named mr. Ali. Some believe that suggests the men coordinated their activities. Another critical clue, the Surveillance Video of the suspects moving through the airport. Fbi officials hope to get that, too, so they can study the luggage of the imposters and their demeanor. Diane . Tracking it tonight. Thank you, pierre. And now, the other possibility, a malfunction in the plane. So sudden, so catastrophic, theres no chance to call for help. Was weather, in any way, involved . Or human error . Abcs david kerley talked to the experts. Reporter large passenger jetliners do not just disappear. Nothing causes an airplane to come down from 35,000 feet, other than things that can be catastrophic. Reporter and the list is long. A total structural failure. Loss of both engines. Complete electrical failure. Or pilot error. In fact, a tenyear study by boeing showed that nearly twothirds of aircraft losses are due to human factors. Even without the wreckage, investigators should be interviewing everyone who touched that plane. Those who loaded food. Pilots who flew this jet on earlier flights, maintenance records, cargo handlers. In fact , it was improperly stored cargo that led to a fire which brought down a valujet in the florida everglades. So, we need to keep an open mind, continue the search, find the wreckage, find those black boxes and begin to solve this mystery. Reporter those two black boxes, which record the pilots voices and data from the plane, can be critical. After nearly two years, those from air france 447 were recovered from the bottom of the atlantic by a mini sub. They showed that a sensor malfunction followed by pilot error led to the deadly crash. Recorders will tell us what happened, but sometimes not why. That was the case with twa 800, which went down off long island. It was an explosion. But it wasnt until all the recovered debris was reassembled that investigators could tell by bent supports in the belly of the plane, that the Center Fuel Tank exploded, ignited by a frayed wire. But tonight, with so few facts, flight 370 remains in the category of unsolved mysteries. Its unlikely it will remain a mystery. Every crashed passenger plane in recent history has been discovered. And the pieces of debris, a piece of skin like this or a seat, can yield a lot of clues. But there is time pressure because the batteries in those allimportant black boxes only lasts for 30 days. Diane . All right, david. I know you and the team will be staying on the story, minutebyminute, both on the air and at abc. Com. And now, next, back here at home, tonight. Officials in california say they dodged a big one. A 6. 8 magnitude earthquake. The largest there since 2010. It struck last night, by 1 estimate, lasting nearly 40 seconds. The epicenter, 50 miles west of eureka in northern california. But tremors felt as far away as oregon. No major damage, no injuries. But 3,000 people wrote in to say, they felt it, too. And today, some answers to a question asked by everyone in this country, after the shooting at the Elementary School in newtown, connecticut. Why . And what was in the mind of the shooter . For the first time, his father reveals details about the son he says changed. Heres abcs Senior National correspondent, jim avila. Reporter those killer eyes. And today, new insight into the mind behind them. Speaking for the first time to the new yorker magazine, adam lanzas father, peter, says he wishes his son was never born. You cant get any more evil. Adams dad describing him as, just a normal, little weird kid who didnt speak until he was 3. So sensitive to touch, the tags in his shirt had to be removed. Diagnosed with the asperger form of autism at 13. But peter lanza says autism was not responsible for the shooting spree. Study after study shows that asperger patients are rarely violent. In fact, the most comprehensive study of mass murderers found that only one other mass killer suffered from autism. Adams father says the boy loved Sandy Hook School but worsened as a teen. Social awkwardness, the uncomfortable anxiety, unable to sleep, stress, unable to concentrate, having a hard time learning, the awkward walk, reduced eye contact. Today, the father finally warning other parents, this could happen to them. Jim avila, abc news, washington. And next, here, tonight, a powerful group of people, rock stars, actors, executives, moms and dads, are uniting against the negative force of a word. It is a word that can take hold in grade school and crack confidence and dreams for a girl. That word is bossy. And nightline anchor, cynthia mcfadden, reports on the uprising, tonight. Reporter from beyonce. Im not bossy. Im the boss. Reporter to an array of celebrities. Being labeled something matters. Reporter today, a campaign is being launched to ban a word surprising in its power. Bossy. Spearheading the effort, sheryl sandberg, facebook c. O. O. And disney board member, the parent of abc news. This is the other b word. We call girls bossy on the playground. We then call them too aggressive or other b words in the workplace. Reporter the idea to ban bossy grew out of her book, lean in. Shes now joined by the head of the girl scouts, anna maria chavez. Why does bossy matter . Words matter. And girls are listening. We know that more boys than girls want to lead. And if you ask girls why they dont want to do it. They dont want to be disliked and they dont want to be called bossy. Reporter raise your hand if anyone has ever called you bossy. We saw that play out with this group of first grade girls at the Hunter School in new york city. So, whats more important . To be liked . Or to be a leader . To be liked. If youre a leader, your friends will get mad at you. And they wont want to be your friend anymore. Reporter in fact, Research Shows a direct link. A third of the girls who do not want to be leaders say its because they fear being called bossy or being disliked by their peers. I was called bossy when i was in ninth grade. My teacher took my best friend, mindy, aside and said you shouldnt be friends with sheryl because shes bossy. And that hurt. Reporter she overcame it. Many dont. We are 5 of the fortune 500 ceos. We are 17 of the board seats. We are 19 of the u. S. Congress. Thats not enough for 50 of the population. If you paid women as much as men, wed cut the poverty rate for this nations children in half. Reporter so, you really think you can change 77 cents on the dollar by banning bossy . We think it all goes together. Reporter sandberg hopes that by banning bossy, little girls will have one less obstacle to overcome. Cynthia mcfadden, abc news, new york. And more of cynthias reporting tonight on nightline. And next, we want to show you dramatic video, a dramatic rescue, of a hiker who plunged down the side of a mountain in north carolina. A National Guard helicopter was called in to pull the hiker in to safety. Police say he was repelling down the mountain, there he is, about 40 feet, he had fallen. And he was conscious, clinging to a rock for 4 1 2 hours, until help arrived and carried him away. And up next, right here tonight, something very personal from someone you know on world news. Youre going to see a panic attack on live tv. How it started our dan harris on a journey to find something that night make your life happier, too. When were back in two minutes. Music stops music resumes purina pro plans bioavailable formulas deliver optimal nutrient absorption. Purina pro plan. Nutrition that performs. It may seem strange, but people really can love their laxative. Especially when its miralax. It hydrates, eases, and softens, to unblock your system naturally. 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For my pain, i want my aleve. [ male announcer ] look for the easyopen red arthritis cap. And next, tonight, something different. Imagine millions of people watch your life come unglued. An allout panic attack on tv. It happened to our dan harris. But his journey of discovery brought back some lessons for all of us about our lives, too. And hes telling us about it tonight. Dan . Reporter diane, this is a very personal story, as you know, because you were there when it all started. Sometimes there are things that are holding us back from being happy. And were not aware of that until life hits us over the head with a frying pan. And that is what happened to me. From abc news, this is good morning america. Reporter welcome to the most embarrassing day of my life. Were gonna go, now, to dan harris, who is at the newsdesk. Dan . Good morning, charlie and diane. Thank you. Reporter this is me, ten years ago. And the reason this is the most embarrassing day of my life is not that it looks like ive been attacked by a blow dryer and a can of hair spray. No, its that im about to freak out on national television. Health news, now. One of the worlds most commonly prescribed medications may be providing a big bonus. Researchers report people who take cholesterollowering drugs called statins for at least five years, may also lower their risk for cancer. But its too early to to prescribe statins solely for cancer production. Reporter at this point, i realize im helpless. So, i bail right in the middle. That does it for news. Were going back to robin and charlie. Thank you, dan harris. Some of the headlines of the morning. Reporter once the fear subsided, the humiliation rushed in. I knew with rocksolid certainty that i had just had a panic attack on national television. So, why would i tell you this very embarrassing story . Because that onair meltdown was the culmination of something that had been building for years. Something i had never stopped to address. Its something we all battle, whether we have panic attacks or not. Call it the voice in your head. I feel stress. Reporter its the inner narrator that can control us and get in the way of living the life we want to lead. For brian simmons, it was outbursts of anger. I would act very reactively. Reporter for becky schmitz, it was emotional eating. Eating was my security blanket. Reporter for a young dr. Mehmet oz, it was a racing mind that kept him from focusing on one thing at a time. For me, saying a voice in the head is too benign of an expression for what really happens. That massive cacophony that we hear, deafeningly loud. Reporter does it surprise you at all how much time we all spend fixating on these selfdefeating voices we hear . I have always been surprised how much time we spend wasted on the voices in our head telling us we are not good enough. Reporter in my case, like many americans, my inner voice was pushing me to succeed. This is me in my late 20s. Thank you, dan. Reporter i had my dream job. But i also had doubts about whether i was good enough. Its hard to do that. Im going to try. Three, two, one. My solution, become a workaholic. After 9 11, i volunteered to spend years in war zones, where i covered the heroics of our men and women overseas. And got a real taste of both the horror and adrenaline of combat. After years of always barreling forward, when i finally slowed down, it was as if my mind revolted and i got depressed. And so, in my free time, i briefly but stupidly began selfmedicating. And it was those recreational drugs, my doctor would later tell me, that almost certainly produced that onair panic attack. But losing it in front of 5 Million People became a turning point. It set me off on a strange, unplanned odyssey. The kind of search so many of us embark upon for answers, understanding and strength. Ultimately, it would lead me to something i never would have expected, as it has for dr. Oz and millions of others. Going inside my mind is no longer going behind enemy lines. Reporter after a journey that involved megachurches, selfhelp gurus and brain researchers, what i found is simple, scientifically tested and completely free. Its being done by executives, pro athletes and u. S. Marines. Its not a miracle cure. But i like to say it makes you about 10 happier. More on that right here tomorrow night. Right here. And again, dan, for all of us who have been through this with you, wow. Thank you. Thank you. Thank you. And learn about the simple answers dan found tomorrow on world news, in his new book 10 happier. Dont miss tomorrow night. Remember the movie dumbo and those extra large ears . How in real life, they help elephants understand us. 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