Are those marks . The science revealed. Good evening. And its great to have you with us here on a monday night. And we begin with the travel nightmare, still playing out at this hour. Thousands of passengers stranded after a computer outage at delta airlines. The scene in boston. Passengers who should have been in the air waiting in long lines there. Many still hoping to get on flights. And this image from denver tonight. The Ripple Effect being felt across this country. And just take a look at the radar from last monday morning at 7 00 a. M. You can see the number of delta flights in the air. And the same time today, just a few delta flights getting off the ground there. Abcs david kerley, leading us off. Reporter delta, the countrys secondlargest airline, and its passengers, grounded. Everything is down right now. Everything is down . Yeah. Reporter a computer meltdown that has already delayed a third of the airlines 6,000 flights. For a short time this morning, in the air over the u. S. And not just here. Lines forming as deltas entire computer system, worldwide, went down. Leaving jets from newark to london stuck at the gate. I was like, oh, no, you know, were headed out, and we might no have anywhere to go. Reporter for some passengers, a night sleeping on the floor. Frustrating delays. I tried to call delta and they told me that id have a threehour hold. Reporter an electrical component failed at deltas atlanta center, a power outage that shut down computer systems. Pilots couldnt get data. Working. The ceo took to twitter. I apologize for the challenges this has created for you. Reporter computers. We rely on them for everything, dont we . Its a good thing, until the Technology Goes bad, right . Reporter just last month, it was southwest that suffered a computer glitch, leading to the cancellation of 2,300 flights. Delta is still struggling to get back on schedule. Tonight, delays range from one to three hours for flights. David . David kerley, leading us off tonight. David, thank you. Boy who died while on a water slide at a water park here in the u. S. , in kansas city, kansas. The slide is the tallest in the world, taller than the empire going down the slide, you can reach speeds of nearly 70 miles an hour. 10yearold caleb schwab was there with his parents and three brothers. His father is a state representative. And tonight, what one witness, a nurse who was right there, now says he witnessed. Abcs alex perez is in kansas city. Reporter tonight, an eyewitness giving the first accounts of the horrific accident that killed 10yearold caleb schwab. Basically, i heard a couple loud booms, just sounded like something hit the slide like, boom, boom, and looked at my cousin standing next to me, i said, i think thats a body. Outside of the raft. Reporter steve cast nay day was in the schlitterbahn water park in kansas city sunday afternoon. He says schwab was riding in the front of the raft with two women in the seats behind him when the hand on the slide, the lifeguard said, theres nothing you can do. Reporter earlier in the day, cast nad nay day rode that water slide with his cousin. She told him, the velcro on one of the two seat belts came loose. Her belt has come undone. Reporter schwab was a freckledfaced baseball fanatic and son of kansas state representative scott schwab. In a statement, the family saying, since the day caleb was born, he brought abundant joy to our family. The ride, called verruckt, the german word for insane, standing the statue of liberty, and plummets 17 stories in just seconds. Riders reaching speeds of nearly 70 miles per hour. Abc news was there when the ride opened two years ago. The slide requires a minimum height of 54 inches and two to three riders must be in a raft. Combined weight of the riders must be between 400 and 550 pounds. Reporter but before its big debut, questions about its safety. Early tests showing sandbag dummies flying off the slide. And safety nets were added. And in a statement tonight, park officials would only say the investigation into what went wrong is ongoing. The slide will remain closed indefinitely, but the rest of the water park is set to reopen on wednesday. David . Alex perez in kansas. Alex, thanks. Now, to major developments in the race for the white house tonight. A group of 50 republicans signing a letter this evening saying donald trump, in their words, would be, quote, the most reckless president in american history. It comes just as trump tries to out tonight. Showing Hillary Clinton at 46 , trump at 34 . She has a 12point lead. Tonight, trumps new tax plan, and how he handles protesters in the crowd. Is it a sign, a new sign of discipline . And tonight, an apparent break within the bush family. Who is now signaling support for trump . Abcs tom llamas, on the campaign trail. Reporter in a rare moment today, donald trump, who never backs down from a fight, let protesters interrupt him at i will say, the Bernie Sanders people had far more energy and spirit. I will say that. Reporter trump once encouraged his supporters to take on people disrupting his rallies. Knock the crap out them. All right, you can get them out. Id like to punch them in the face, ill tell you. Reporter but today in detroit, trump shed that brawler label to focus on the economy. I want to jumpstart america, and it can be done, and it wont even be that hard. Reporter trump revealing that under his plan, childcare expenses wont be taxed. And hell simplify the tax code by having just three brackets. 12 , 25 and 33 . For Many American workers, their tax rate will be zero. Reporter Hillary Clinton today saying shell be a Small Business president , slamming trumps proposals. They tried to make his old, reporter for her part, clinton Still Standing by this promise she told david. You have said, it is your goal not to raise taxes on families making under 250,000 a year, a goal. But can you say thats a promise, as you stand here tonight . That is a pledge that im making. I made it a promise . When i ran in 2008. Yes. And it was the same one that president obama made. Reporter and now, trump may have more than clinton to worry about. I do believe hes a fraud and hes a conman. Reporter former cia operative Evan Mcmullin launching an ind mcmullin, who recently worked on policy in the house of representatives, is being helped by republicans unhappy with trump. Well, what do you say to republicans who support trump who say a vote for you is going to be a vote for Hillary Clinton . He was already losing badly. Hes alienated broad swaths of our population. Donald trump cannot win. He is ensuring that Hillary Clinton win the white house. Reporter and tonight, in what appears to be a break with with trump, one of jeb bushs sons telling republicans they have to back trump. And you know, for team bush, its a bitter pill to swallow, but you know what . You get back up and you help the man that won and you make sure that we stop Hillary Clinton. And tom llamas with us live here in new york tonight. Tom, back to that list of 50 National Security advisers, all of them republicans, i mentioned a moment ago, thats a rare move. Any reaction from the trump camp tonight . Reporter david, donald trump just responded, calling the people on that list, part of the failed washington elite that have made the world a more dangerous place. David . Tom llamas with us live again tonight. Tom, thanks, as always. Overseas tonight, the hunt is on for an american professor who has been abducted in afghanistan. Officials say he and another professor who teach at the American University were driving near the school in kabul when several men in military uniforms stopped their car and abducted them. Kidnappings and other crimes have reportedly surged since western troops started to withdraw. Devastating toll from a suicide bombing there. At least 70 people were killed. Most of them lawyers who had gathered after the head of their local Bar Association has been targeted and killed. A breakaway Taliban Group and isis both claiming responsibility. Back here at home tonight, and to severe floods were watching at this hour. Parts of floridas gulf coast, already under water. The pictures. Roads and businesses in st. Pete beach already swamped. A number of accidents have been cleared along state gh up to a half foot of rain coming in some parts. Also, a Tropical Storm were watching. So, lets get right to rob here tonight. Hey, rob. Reporter david, a lot of deep tropical moisture over the southeast. Look at the radar. You see it rotating around this low. We have flooding from raleigh to asheville. But the big target is florida, the panhandle there. We have flood watches that have expanded west toapalachicola. Flood warnings between perry and cross city. Over 12 inches of rainfall falling there. Over 20 in some of the areas just offshore. Think, is going to persist right through the end of the week. Here is javier. Probably see this moisture get into the Desert Southwest later on. Right now, it is hitting cabo san lucas. Max winds, 65 miles an hour. Will remain pretty strong as it rides up the baja. Very active Hurricane Season in the pacific, david, this year. Rob, great to have you. Another weather headline were following tonight, a small wildfire east of los angeles, exploding in just hours. Tripling in size, in fact. The pilot fire, as it is being called, is burning in the San BernardinoNational Forest tonight. Several dozen homes have been evacuated and parts of two state highways are now closed. Now, to the american athletes in rio making us proud already, and taking the lead. Michael phelps learning his 19th gold in the 4 x 100 freestyle relay. And first time winner ryan held, his tears as the National Anthem was played. American swimmer lily king with a number one signal when she won. But then signaling Something Else to the russians, its making news tonight. The mens Gymnastics Team posting this image of themselves, hoping for some extra support in their team usa, ahead in the medal count. And abcs matt gutman, from rio. Reporter tonight, some bling added to Michael Phelps treasure chest. His 19th gold. A domination of the pool in the 4 x 100 meter freestyle. Phelps with that now customary celebratory flex of his 64 frame. And as the anthem played, the vet grinning, but rookie ryan held couldnt hold back his tears. The Caeleb Dressel cries, and finally, the most decorated olympian in history is overcome, too. Also winning in the pool, phenom katie ledecky. Besting her own world record in the 400 meter freestyle, so far ahead, she was already celebrating before her competitors even touched the wall. It wasnt only smiles in the pool, some scowls, too, and a taste of the cold war when yulia efimova, previously suspended american swimmer lily king responding with a finger wag of her own, while watching the event in the ready room before beating efimovas time herself. Shes shaking your finger number one and youve been caught for drug cheating, im just not a fan, so you know, going to go swim my heart out for usa and hopefully that turns out the best. Reporter these fellow superstars sharing a picture. Phelps and the human spring known as simonbi sweep of the Gymnastics Team competition qualifier. The crowd roaring as biles nails her signature move named after her, of course. The women finishing one, two and three. The mens Gymnastics Team currently out of medal contention, but it is led by sam mikulak. Were training to be the best in the world. We have that as our goal, and thats what we want to accomplish. Reporter who we met at team usas Training Facility in he even took some time out to teach me the basics of the pommel horse. Mikulak suggesting today that the mens team, who always seem to get less attention than the womens team, might better market their sport if they competed shirtless. They certainly made a statement with this instagram picture they posted in copacabana beach earlier this year. Also disappointing, surprisingly, the williams sisters, out in the first round of their olympics doubles tournament. This is their first loss in olympic doubles since 2000. But with katie ledecky, Michael Phelps and the womens Gymnastics Team all vying for gold behind me tomorrow, there is plenty of opportunity for redemption. David . Its been an incredible start. Matt gutman tonight, our thanks to you. And well hear from amy robach a little later. Next tonight, though, to a new study, when it comes to Drowsy Driving and the danger right next to you on highways across this country. Abcs gio benitez with the new findings tonight. Among them, that Young Drivers are especially at risk when it comes to sleep deprivation. Reporter tonight, a startling new look at the growing sleeper threat othe you remember this fedex truck, weaving. A sleepy driver allegedly at the wheel. Then watch as it slams into a car, losing control. But in that new report, teens and young adults are now to blame for more than half of these crashes. Nearly 84 million fatigued americans drive every day. Last year alone, 5,000 people killed. Companies like volvo Offering Technology to catch drowsy drivers with automatic brakes. Im trusting it, no brak no brakes. Reporter wow. And alert systems. Here we go. Driver alert. Time for a break. Reporter and david, experts say the increase in teen Drowsy Driving is due in part to digital obsession. So, while the problem is new, there are some old solutions. Go ahead and turn your radio on while youre driving. Or open that window to let that fresh air in. Or even stop when youre on those long drives. David . The ageold advice still works. There is still much more ahead on world news tonight this monday. Another female jogger discovered dead. The second young woman in less than a week now. News coming in on the investigation, and the new warning from now this Second Community tonight. Also, the murder mystery in san francisco. The College Baseball star killed near a popular tourist spot. Authorities say he was attacked while playing pokemon go. And then later, right here tonight, the french gymnast who broke his leg from the knee down. It was so difficult to watch. The new image and message from him tonight. Michael phelps, already winning gold as we just heard from matt, but so many asking, what is the other color there, those marks . Amy robach, standing by tonight. Shes got the Science Behind what Michael Phelps did. Im mary ellen, and i quit smoking with chantix. I have smoked for 30 years and by taking chantix, i was able to quit in 3 months and that was amazing. Along with support, Chantix Varenicline is proven to help people quit smoking. It absolutely reduced my urge to smoke. Thoughts or actions while taking or after stopping chantix. Some had seizures while taking chantix. If you have any of these, stop chantix and call your doctor right away. Tell your doctor about any history of Mental Health problems, which could get worse or of seizures. Dont take chantix if youve had a serious allergic or skin reaction to it. If you have these, stop chantix and call your doctor right away as some can be lifethreatening. 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Its the whole package. No ones done this. Crest healthy, beautiful smiles for life. Dont let dust and allergens get beautiful moments. Fes most allergy pills only control one inflammatory substance. Flonase controls 6. And six is greater than one. Flonase changes everything. . Next tonight, there are now two separate murder mysteries under investigation. Police are looking into the second death of a female jogger. A google employee, found dead in massachusetts. This just days after a young woman was killed jogging in new york. Reporter tonight, residents in princeton, massachusetts, are on edge. Authorities are warning them to use an abundance of caution, after discovering the body of 27yearold vanessa marcotte, who disappeared while jogging on sunday afternoon. We have a young woman who appears to be a murder victim. And you cant be too careful right now. Reporter marcotte was visiting her mother in massachusetts, but she lives in new york city, where she works for google. Around 1 00 p. M. Sunday, she went for a jog and never came back. We do not know if this was a random act. Reporter marcotte was found by a police k9 unit in a wooded area half a mile away from her mothers house. She is the second new York Resident to be killed in less than a week while going out for a jog in broad daylight. On tuesday, karina vranos father found her body with police just off of a jogging trail near her parents home in chilling message for her daughters killer. I guarantee you, you will pay forever. Reporter Authorities Say there is nothing at this point connecting the massachusetts case with the death of karina vetrano. They are urging people to jog in pairs and Pay Attention to their surroundings. David . Line see davis, thanks so much. When we come back, the new headline that can involve anyone that shops online. The new rival for amazon tonight, and will it save you money . Also, we all saw that french athlete on the ground, breaking his leg from the knee down. 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The cyclist from the netherlands going head over heels on the bike course in rio. Just incredible, landing on her head, suffering a concussion. But she did tweet from the hospital today, saying, thank you for your support, saying this is not easy, coming once in every four years. The french gymnast getting back on his feet tonight. Millions saw him suffer a gruesome hes now recovering after surgery, already Walking Around the hospital. And still in rio tonight, a tennis player from argentina seen right here, stuck inside an elevator for 40 minutes, trying to get to his match. His countrys Handball Team coming to the rescue. He got out of the elevator, went on to beat the top ranked player in the world, novak djokovic. That elevator was good luck. When we come back on a monday, Michael Phelps wearing gold, but covered in mystery marks. So many asking, where did they come from . Houston Mission Allergy escape. All. Gone to extremes to escape their unrelenting nasal allergy symptoms. 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Cups on the skin, supposed to help increase blood flow and reduce soreness. Phelps is such a believer in it, he featured it in his recent under armour ad. And hes not the only one using the technique. Gymnast alex naddour posted this instagram picture of himself, all with those telltale cupping bruises, which can take two weeks to heal. Many athletes here believe cupping speeds the healing of overworked muscles. Science has yet to provide any acal but placebo effect or not, one thing is for sure. These athletes believe it is giving them the extra push they need. David . He got the gold. Must have worked. Amy robach tonight, thank you. And well see you on gma. Im david muir. I hope to see you right back here tomorrow night. We start with a tragic breaking news. This happened just this afternoon at a local home park. 25 vehicles five vehicles in a crash on i 25. This is near 136. Reporter they have nonlife threatening injuries. They were blocked for a couple of hours. Police just cleared the scene about 10 minutes ago. Traffic was slowing down of one car was driving in the center llne for him to another. The semi almost went over the submit divider