To publicly question the engineering behind our smartphones, apps and social media platforms. He says theyre built to be addictive, and warns of long term consequences for us and our families. Never before in history have a handful of people at a handful of Technology Companies shaped how a billion people think and feel every day with the choices they make about these screens. Bruno mars may be the hottest lucky man in show business. And when you hear how he grew up youll understand why this fullback never takes anything for granted. Your house. I just really care about what people see. I want them to know that im. Im working hard for this. The artists that i look up to like, you know, michael, prince, james brown theyre not phoning it in. Theyre going up there to murder anybody that performs after them or performs before them. Im steve kroft. Im lesley stahl. Im bill whitaker. Im anderson cooper. Im lara logan. Im scott pelley. Those stories, tonight on 60 minutes. [beeping] wow. Good to know we have that on our prius [beeping] and lane departure alert. See what i mean . With so many safety features like pedestrian detection and lane departure alert, toyota doesnt need us test dummies as much. Oh, i get it, man hey, i gotta get my thrills somehow. The 2017 prius with Toyota Safety sense standard. Toyota. Lets go places. woman theres a moment of truth. Etes, and now with victoza®, a better moment of proof. Victoza® lowers my a1c and blood sugar better than the leading branded pill, which didnt get me to my goal. Lowers my a1c better than the leading branded injectable. The one i used to take. Victoza® lowers blood sugar in three ways. And while it isnt for weight loss, victoza® may help you lose some weight. Noninsulin victoza® comes in a pen and is taken once a day. announcer victoza® is not recommended as the first medication to treat diabetes and is not for people with type 1 diabetes or diabetic ketoacidosis. 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Yeah, i love you, do you love me, too . Clap your hands if it feels good clap your hands, ohh i have no idea whats in tbut with this usp seal i know exactly whats in my nature made gummies. Nature made has the first gummie certified by usp. A Non Profit Organization that sets purity and potency standards. We, the device loving people want more than just unlimited data. We want unlimited entertainment. So we can stream unlimited action. Watch unlimited robots. Watch unlimited romance. If you are into that. But we also want more like. Unlimited hbo. Can i stop dying now mark . No cant do mi amigo. Its unlimited. Besides you are really good at it james. Dont settle for any unlimited data plan. Only the at t unlimited plus plan comes with hbo included at no extra charge. Whitaker north korea continues to test missile after missile, raising tensions with the United States. Kim jongun has promised to test an intercontinental ballistic missile. Such a weapon could eventually carry a Nuclear Warhead and threaten american cities. U. S. Defense secretary jim mattis called that possibility and the missiles kim has aimed at south korea a clear and present danger to the world. As we first reported in february, we went to south korea and saw how tense the situation has become. We got two important perspectives from the commander of the 28,000 american troops there, and the highestranking north korean to defect in decades. He told us kims Missile Program is part of an obsession with the survival of his regime. Thae yongho ive been in seoul for six months, and to be honest, i was never public until now. Whitaker we went for an evening out in seoul with thae yongho. He was north Koreas Deputy ambassador in london before he defected in august. A defection by someone of his rank is extremely rare. This was the first time he had walked about in public. Just off camera, six bodyguards watched his every move, as we made our way down one of the busiest shopping streets in asia. North korea has assassinated defectors in seoul. Thae yongho in order to prevent more possible defections from north korea i think kim jongun will do anything. Whitaker even kill you . Thae yongho of course. Why not . Whitaker the man who could order an assassination is kim jongun. The dictator is the third member of the kim family to rule north korea. They have controlled the impoverished country with an ironclad fist for 70 years. This missile test was in february. Kim devotes a quarter of his countrys economy to weapons like this, and his million man army, despite widespread food shortages. Thae yongho kim jongun strongly believes that once he possesses i. C. B. M. , then he can easily scare off america. Whitaker right now, how dangerous is north korea to the stability of south korea and as a threat to the United States . Thae yongho kim jonguns capability to wreak harm, not only to america but also to south korea and the world, should not be underestimated. Whitaker during his five years in power, kim jongun has expanded north Koreas Nuclear arsenal, despite International Sanctions that have brought his countrys economy to its knees. Electricity is scarce. From space, north korea is a black hole. Thats it, wedged between the shining lights of south korea, and china to the north. Thae said he was living a comfortable life here at the north Korean Embassy in london before he fled with his wife and two grown sons. His job in london was to spread north korean propaganda, and report back on his colleagues. You all live together under one roof . Thae yongho yes. Whitaker so you could keep an eye on each other . Thae yongho keep an eye on each other, control each other, and even spy on each other. Whitaker but thae said he lost all faith in the regime when kim jongun killed his own uncle in 2013, and executed dozens of perceived enemies, including diplomats. I have seen tape of you thae yongho yes. Whitaker giving speeches in london. Youre very convincing. You seem to be a true believer yourself. Thae yongho if i show any sign of hesitation, then i would be, you know, sent to whitaker what would happen to you . Thae yongho i would be sent to prison camps. So my whole familys life will be jeopardized. Whitaker thae said there was one big obstacle to his defection. Thae yongho all north korean diplomats are forced to leave one of their children back in pyongyang as a hostage. Whitaker as a hostage . Thae yongho yes. Whitaker his break came when that policy unexpectedly changed, and thaes oldest son was allowed to join the family in london. They all agreed to defect. He would not give us the details of his escape and who helped, but we know he was kept in a safe house by south korean intelligence agents and questioned for more than three months. He said it was too dangerous for us to meet his family. Now, ive been talking to you for a couple of days now. You come from a secretive place. Thae yongho yes. Whitaker but i think you still have lots of secrets. Thae yongho sure. Yes. Whitaker how do we know that what he is telling us is the truth, not just selfserving . Chung min lee you know, when a defector makes a decision to jump ship, he is doing it at a huge cost, his coworkers or relatives, inlaws will be purged or killed. Whitaker chung min lee was south koreas ambassador for National Security until last year. He said looks here can be deceiving. The risk of war today is exceptionally high. I think most americans right now would see this as a holdover from the cold war. But it seems to be quite hot when youre here. Chung min lee thats right. This is the only place on the entire planet where you have nearly a million forces on both sides standing, ready to fight a war in basically a nanosecond. And who is there right in the middle of this . Its basically the u. S. Forces. Whitaker lee helped shape seouls policy toward north korea. He went with us to panmunjom, the village in the two and a half mile wide Demilitarized Zone that separates north and south korea. As we got closer, seouls sprawl gave way to military check points. The agreement that suspended the korean war was signed here. But theres still no peace treaty. The war began when the communist north invaded in 1950. 34,000 americans were killed in what amounted to a stalemate. Chung min lee so this is the longest war on paper since world war ii. So we are still technically in a state of war. Whitaker today both sides still stare each other down. Thats north korea right there, that building just 100 yards away. We were told to avoid sudden movements that could be interpreted as threatening. It wasnt long before north korean soldiers took an interest in all the activity. So we went inside a negotiation hut that straddles the border. What is right behind the door . Chung min lee right behind the door is, basically from there this is north korea. Once you go out, thats it. We have no jurisdiction on that side of the door. Whitaker so if i were to walk out that door . Chung min lee thats it. Whitaker im in the hands of north korea . Chung min lee thats true. Whitaker lets stay on this side. It was all surreal. This part of the d. M. Z. Closest to seoul had the feel of a cold war theme park complete with a fake village on the north korean side built to impress the south. And in case you missed the point, loudspeakers blared propaganda marshal songs praising kim jongun. A few miles away, tourists crowded an observation deck, snapping photos with troops, cardboard cutouts, and the real ones. What the visitors could not see on the other side of those mountains are 10,000 artillery pieces the north Korean Military has aimed at seoul. All of which could reach the 28 Million People in and around the south korean capital. U. S. War planners estimate 500,000 people could be killed in a second korean war. Is there any other metropolitan area on earth this vulnerable . James slife certainly nothing that approaches seoul in terms of the size, the density of the population. Theres nothing like it. Whitaker u. S. Air force general james slife flew with us over the city. Its just 30 miles from the d. M. Z. We landed at Osan Air Base where korean airmen and their american colleagues monitor all activity north of the d. M. Z. For security, they shut off the giant video displays right before we came in. This facility is among the first to detect north Korean Missile launches. Youre, like, on a war footing all the time. Slife thats right. This is truly one of those places where the best way to prevent a war is being ready for a war. Whitaker the norths latest missile tests used a new type of solid fuel engine and were fired from mobile launchers, making them quick to deploy and difficult for u. S. Satellites to detect in realtime. Slife with the development of ballistic missiles, with the development of nuclear weapons, things here have a tension that you can feel in the air as you move around places like this. Whitaker we wanted to talk to the general who leads u. S. Forces in korea and would command korean troops in the event of a war. He asked to meet us at guard post four. Its a citadel on critical high ground at the end of a road lined with land mines. We were the First American news crew allowed in. This was no cold war theme park. Body armor was required and artillery was on standby in the event we came under fire. General vincent brooks has commanded u. S. Forces fighting in iraq and afghanistan. I dont think people at home know how tense this line is. Vincent brooks what it takes to go from the condition were in at this moment to hostilities again, is literally the matter of a decision on north koreas side to say fire. And on top of this, we have the missile capability thats been developed, over 120 missiles fired just in the time of kim jongun alone. Whitaker so now theyre talking about i. C. B. M. S that might be able to reach the west coast of the United States. How do you stop them from taking that next step . Brooks north koreas responsible for the direction that the region is going. It is responsible for the conditions of instability that are starting to arise. It has to take responsibility for that and stop. Whitaker his country is poor. His people are starving. What is it that he wants . Brooks survival whitaker survival. Brooks and recognition. Whitaker kim jongun is now recognized as a global threat. U. S. Intelligence estimates he has at least ten nuclear weapons. If the u. S. Decided it had no choice but to launch a pre emptive strike on an i. C. B. M. Test site, it could trigger the unthinkable. Brooks if north korea uses nuclear weapons, it will be met with an effective and overwhelming response. Now they can take it to the bank. We make that same point to our allies and partners, like the republic of korea and like japan. Whitaker effective and overwhelming response . Brooks effective and overwhelming response. Whitaker wipe north korea off the map . Brooks whatever overwhelms you. Whitaker that warning rang in our ears as we returned to seoul and met one last time with defector thae yongho. We asked about his brother and sister, still in north korea. What do you think has happened to them . Thae yongho they will be sent to prison camps. That is what i am absolutely sure. Whitaker does that weigh on you . Thae yongho of course. Yes. I cannot get rid of that kind of nightmare after night of seeing my brother and sister in prison camps. Whitaker thae told us he believes he can help topple the north korean regime by encouraging other defections and speaking out. During the campaign, President Trump called kim jongun a maniac. His language has been much more careful since the latest missile tests. Join the 60 minutes team under the watchful eyes and loaded guns of the north korean army. You are watching a very on 60minutesovertime. Com. Sponsored by pfizer. Your body was made for Better Things than rheumatoid arthritis. Before you and your rheumatologist move to another treatment, ask if xeljanz is right for you. Xeljanz is a small pill for adults with moderate to severe ra for whom methotrexate did not work well. Xeljanz can reduce joint pain and swelling in as little as two weeks, and help stop further joint damage. Xeljanz can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections, lymphoma and other cancers have happened. Dont start xeljanz if you have an infection. 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According to a former google product manager you are about to hear from, Silicon Valley is engineering your phone, apps and social media to get you hooked. As we first reported in april, he is one of the few tech insiders to publicly acknowledge that the companies responsible for programming your phones are working hard to get you to feel the need to check in constantly. Some programmers call it brain hacking, and the tech world would probably prefer you didnt hear about it. But Tristan Harris openly questions the longterm consequences of it all, and we think its worth putting down your phone to listen. Tristan harris this thing is a slot machine. Cooper how is that a slot machine . Harris well, every time i check my phone, im playing the slot machine to see, what did i get . This is one way to hijack peoples minds and create a habit, to form a habit. What you do is you make it so when someone pulls a lever, sometimes they get a reward, an exciting reward. And it turns out that this design technique can be embedded inside of all these products. Cooper the rewards harris is talking about are a big part of what makes smartphones so appealing. The chance of getting likes on facebook and instagram. Cute emojis in Text Messages. And new followers on twitter. Harris theres a whole playbook of techniques that get used to get you using the product for as long as possible. Cooper what kind of techniques are used . Harris so, snapchats the most popular messaging service for teenagers, and they invented this feature called streaks, which shows the number of days in a row that youve sent a message back and forth with someone. So now you could say, well, whats the big deal here . Well, the problem is that kids feel like, well, now i dont want to lose my streak. But it turns out that kids, actually, when they go on vacation, are so stressed about their streak that they actually give their password to, like, five other kids to keep their streaks going on their behalf. And so, you could ask when these features are being designed, are they designed to most help people live their life . Or are they being designed because theyre best at hooking people into using the product . Cooper is Silicon Valley programming apps or are they programming people . Harri