it's march 26th. this morning, a warning for north korea. overnight, president obama issued a direct collage to the leaders with nuclear ambitions north from the dmz.ring into and new words on the trayvon martin situation. the new tiger woods. back in the winner's circle for the first time in three years. can he keep it going? and the incredible dive. we'll show you what happened while you were sleeping. director james cameron plunging into the deepest part of the ocean. something no one has done alone. good monday morning, i'm john muller. rob and paula are off this

morning. we're going begin with president obama's stern warning to north korea overnight. telling the country it will face the wrath of the world if it doesn't curb the nuclear plans. tahman bradley is live in washington with details. good morning. >> reporter: good morning, john. before the start of the summit, mr. obama had blunt remarks for the leaders of north korea and iran. in south korea for a summit starting today, president obama urged the communist neighbor to the north to change its way. north korea set to launch a rocket next month it says is a satellite for peaceful purposes. mr. obama spoke to the regime's laiders. >> there will be no rewards for provocation. provocation. those days are over. today we say, have the courage to pursue peace and give a better life to the people of

north korea. >> reporter: as the summit kicks off, tensions between the north and south remain high. south korea and other countries warned they might shoot down the rocket if it violates the south's territory. while the north says it would declare criticism of the project a deck a ration of war. the u.s. may withhold food aid. >> you can continue down the road you're on. we know where that leads. it leads to more of the same. more broken dreams, more isolation. >> reporter: president obama is meeting with russia's leaders with the aim of reducing both countries' stock pils of nuclear war heads. >> we have more nuclear weapons than we need. >> reporter: the president also used the start of the summit to pressure iran saying the country

must meet obligations not to pursue nuclear weapons. also in washington today, the supreme court begins three days of arguments on the couldn't constitutionality of the health care overhaul. people have been lined up for weeks to get tickets to get into that session. a great weekend for rick santorum. he scored a blowout win in the indiana primary. it earned him just ten delegates. the primary calendar is headed to the northeast. he's not expected to do as well there. it's one month since a young man was killed by a neighborhood watch volunteer. the man who shot martin is not speaking publicly about the incident, but his attorney and friend spoke to david muir. >> reporter: across the nation the rallies in support of trayvon martin, the unarmed teen

shot and killed by the head of the neighborhood watch. anger growing because the man with the gun, george zimmerman, hasn't been charged. i sat down with zimmerman's lawyer. how does he react? >> i think he's surprised at the way things have taken off. it's become a national issue. that issue calling him a racist. that's not who george zimmerman is. >> you're going to argue this was a case of self-defense. >> the evidence will show that. yeah. >> are you going to use the stand your ground defense? >> i believe that will be applicable in this case. >> reporter: the stand your ground defense. someone who feels threatened has no duty to retreat. when we heard that call to the police, and the dispatch eer saying, are you following him? >> are you following him? >> yeah. >> okay, we don't need you to do

that. >> okay, we don't need you to do that. why did he continue to martin. trayvon martin. >> those are questions that will be answered. >> reporter: we spoke to a friend of zimmerman's. >> he's moved. they've disconnected their phone numbers. they're in hiding. they're fearful. >> reporter: after talking with george zimmerman, he says he's convinced it came down to that final moment. >> at that point, either george or trayvon was going to die. >> as family friend, do you wish george had tlond the dispatcher who said, you don't need to follow him? >> of course. >> there could be charges brought if it is shown it was motivated by racial bias. police in a suburb of san diego investigating the murder of a woman from iraq as a

possible hate crime. the 32-year-old mother of five was found severely beaten in her home. next to a note that said,go bacr go back to your country. new details this morning about the massacre of afghan villagers but a u.s. soldier. they believe robert bales attacked one village, returned to base, and then went out and attacked anoth attacked another one. the u.s. has paid $50,000 to each victim's family. and $11,000 to each person injured. the pope wraps up the first ever visit to mexico. preparations are under way in cuba for the first papal visit in 14 years. yesterday, he told the mexicans to use their faith to fight drug

violence and poverty. in a lighter moment, he tried on a so mshlgs brero. time for the weather across the nation. evening rain from seattle to southern california. strong thunderstorms in the dakot dakotas. cooler air across the midwest and northeast. 40s in the twin cities to boston. 58 in new york. 63 in baltimore. 80s from miami to dallas. kansas city, the 50s. the pacific northwest, 61 in sacramento. coming up, the pox office behemo behemoth. what a weekend for "the hunger games." and an update on dick cheney's heart transplant. and tiger woods crushes any talk of a curse with a big win. we'll hear from him coming up. er

"munger games" feasting at the box office this weekend. the best debut for a first fill nm a series. it could earn $300 million for its studio. it's the first of four for the theorys. it took over $155 million over the week end. "21 jump street" was second.

"dr. seuss" was third. gas prices are up again. the national average is $3.89 a gallon. the high crude oil prices are caused by the standoff with iran over the nuclear program. and flying may get more expensive. the september 11th security fee could be raised up to flat a fl each way fee. that could hurt the industry's recovery. but they've raised prices themselves this year by as much as there are 30 per round trip. overseas markets disappointed. tokyo's nikkei average gained 7 points. hong kong's hang seng gained 50. on wall veet, the dow off 150 points. happy childhood may be worth its weight in gold. it leads to higher earnings

later in life. happier people are more productive and tend to get motivated more quickly. up next, playing a prank on hotels and their guests. wait until you and gone in a and gone in a flash. a sports arena here biting the dust. [ male announcer ] this one goes out to all the allergy muddlers. you know who you are. you can part a crowd, without saying a word. you have yet to master the quiet sneeze. you stash tissues like a squirrel stashes nuts. well, muddlers, muddle no more. try zyrtec®. it gives you powerful allergy relief. and zyrtec® is different than claritin® because zyrtec® starts working at hour 1 on the first day you take it. claritin® doesn't start working until hour 3. zyrtec®. love the air.

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wet on i-35 and 94 in minnesota. rain drenching highways in the dakotas. windy with snow on i-15, 25, 70, 80, and 90 in the rockies. late day downpours make for a slick ride on i-5 from seattle to northern california. now if you're flying, airport delays are possible in minneapolis, denver, salt lake city, boston, and new york. former vice president cheney recuperating in a virginia hospital after a hart transplant. some people are questioning whether at age 71, he was too old to get one. given that thousands of younger people are also in line. we asked dr. richard besser about this issue. >> it used to be that age 55 was the cutoff. anything above that, you wouldn't get transplanted. now they look at the person as a whole. if there's no kidney disease, there haven't been any strokes. they're in good health, age is no longer a barrier. >> he had been kept alive by an implanted heart pump up until the surgery.

he has five heart attacks in the last 25 years. his cardiologist says he's doing exceedingly well. and there is news this morning about sleep and your heart. researchers have found just how dangerous it is to get too little sleep. but they also found there's a greater risk if you get too much as well. abbie boudreau explains. >> it's 4:30 a.m. >> everybody's sleeping, but me. >> it's 1:00 in the morning. i'm not asleep. >> i'm absolutely exhausted. >> reporter: millions of sleep-deprived americans. >> most of the time, i'm tired all the time. >> reporter: and for women it's worse. suffering insomnia at twice the rate of men. a third of all women relying on medication to get sleep. the restless nights have real consequences. a new study says people who get less than six hours of sleep are twice as likely to suffer a stroke or a heart attack and have a higher risk of congestive heart failure. >> when people sleep too little.

not just one night of missing a few hours of sleep, but chronically sleep deprived, we see real metabolic changes. cortisol levels go up. blood sugar can go up. >> reporter: while so many fight to get more sleep, new science also warning not to get too much. more than eight hours of sleep a night put you at higher risk of coronary heart disease. researchers are not exactly sure why more sleep affects your heart. but one thing is clear. getting the six to eight hours should be a priority. just as much as hitting the gym. heart doctors say you have to get the right amount of sleep, or it may make all that effort here in vain. abbie boudreau, abc news, los angeles. >> good to know. pranksters have been having a field day with hotel guests across the united states. not everyone is laughing about it. a group known as prant net university calls the guest in the middle of the night. they pretend to be a manager of an official.

they're told there's an emergency happening, they're instructed to break windows, and even tvs. the gag is posted on the internet. they already caused hundreds of thousands of dollars in damage. in sports, time to check the brackets. the final four men's teams are set for march madness. one game is a bluegrass special. kentucky and louisville. in an intrastate rivalry. the other one is ohio state and kansas. meeting for only the ninth time in their histories. kentucky is the favorite to take it all on april 2nd. the headline on espn.com this morning, say hello to the new tiger woods. after a long drought, 923 days in fact, woods has, at last, won a pga event. he won the way he used to win, decisively. tom rinaldi spoke to him. >> when the final putt dropped, you shouted and shouted again.as in ttranslate what was in those shouts? >> pure joy. you know, i felt that -- once i

knocked the ball on the green, here at 18, the tournament was over. we have seen interesting things happen this year on tour. i had to get it done and put the ball on the green first. >> how, if at all, did this win feel different? >> um -- it feels good. just to come here and play. you know, in a hometown that i lived here for over a decade. it's an important week. and it means a lot to me, this tournament, obviously, with my kids being born here. what arnold's done for our tour and obviously, the community here. >> everything you do is so scrutinized. you hear the numbers, whether it's 2 1/2 years, 30 month, 923 days. we spoke a couple of weeks ago, you said you had zero doubts. what, if anything, did you learn today about yourself? >> i'm getting better. it's a matter of putting four rounds together. i did it this week. >> what does it mean to go to

augusta off a victory? >> it feels good. it feels good. to have that little bit of boost going into augusta. it's an important week. a lot of the things i did here this week will translate well to that golf course and the shape the shot. i'm very excited about that. >> tiger woods at the masters. should be a lot of fun. they've found a colorful way to celebrate spring in utah. thousands of people celebrating with chalk dust. it's the annual festival held at the krishna temple in spanish forks. looks like a lot of fulse."re s" the president's secret life as a basketball coach. and an historic deep sea dive overnight. another feat by hollywood director james cameron. -hold up. -why are we stopping? just need to refill my walgreens prescription.

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he spent hours there filming a national geographic special. a two-man crew touched down there this 1960. cameron is the first one to do it solo. all right, james cameron not the only thing popping up in the pacific ocean. a japanese fishing vessel lost during japan's tsunami is about 150 miles off c coast of british columbia, canada. the rusty both has been aterrorist for a year. and we're getting a glimpse of president obama, not as commander in chief, but as a basketball dad. in an interview, he shared what it's like to coach sasha's team. he's teaching the basics, dribbling and passing. the major challenge for them is getting the ball to the basket. go to espnw.com for more. for some of you, your local news is next. for everyone else, the incredible memory trick all of us can try. ohhh my head, ohhh.

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coming up next at 4:30. san francisco investigators try to unravel the relationships between the newly arrested suspect and five people discovered murder in a home. today supreme court will hear a history making argument on the healthcare law. and more on the forecast. >> brief break from the rain today but more heavy rain is on the way tonight and tomorrow. >> monday morning commu updating the top stories, the supreme court begins three days of arguments of president obama's health care overhaul. a ruling is expected in early summer.

thousands of supporters are expected to rally in sanford, florida, to mark one month since trayvon martin was shot dead. lawyers for the neighborhood watch volunteer who fired the fatal shot say his aks were justi justified. after wrapping up his first ever visit to mexico, pope benedict arrives in cuba. he'll visit santiago before visiting havana tomorrow. let's look at today's weather. late-day rain from seattle to just north of france. windy with snow in the sierra nevada. a wet day into minnesota. and finally, a man who says his memory is just average is the national memory champion for the second year in a row. he set a new record at this weekend's contest. he's here in new york. how and why did he do it? "nightline" anchor bill weir put him to the test. >> reporter: they say dogs have a short-term memory of about 20 seconds. honestly, mine is worse. jack of spades, jack of clubs. >> nope.

>> reporter: it's all the more humiliating because the guy sitting next to me can memorize the order of an entire deck of cards in 63 seconds. just one of the skills that makes nelson dellis the reigning national memory champion. it began when his grandmother got alzheimer's and he got scared. he stumbled into the world of memory competition. and realized that all of these elite mental athletes are also ordinary people with ordinary brains. they've all learned the ancient but simple technique. once you have it down, you, too, might be able to memorize the zip codes of a few dozen complete strangers. >> she was 07928, 02719. >> give him a hand, how about that? >> thank you. >> reporter: the key is to associate vivid images. with mundane names or numbers. my zip code is 10007. how would you lock that in?

>> 100 is frankenstein. 07 is james bond. i picture frankenstein sipping a martini. >> and how do you associate that with -- >> you have anchor hair. i would picture frankenstein inside the wave there sipping a martini glass. >> reporter: so, let's get back to dog brain. oprah winfrey giving me a ford festiva. just a few moments after turning the face cards into images -- jack of diamonds. queen of diamonds. >> mm-hmm. >> and king of clubs. >> there you go. >> look at that! >> pretty cool. >> reporter: bill weir, abc news, new york. >> way to go, bill. stay with us for "good morning america." have a great monday. a great monday.y@ good