mark albert's in washington. mark, good morning. >> reporter: good morning, alison. sources tell cbs news it appears iranian negotiators are playing hardball, a sign the regime may not be getting what it wants in talks aimed at stopping it from developing a nuclear bomb. with less than 24 hours to go, secretary of state jhn kerry and leaders from five world powers continue to press iran to agree to a basic deal that would rein in its nuclear program for at least a decade. both sides realize there is a lot at stake. >> the down side of no deal is a nuclear armed middle east and iran with a weapon. the up side of a good deal is that iran is contained. its nuclear program is contained. >> reporter: difficult issues remain. among them, tehran's desire to continue sensitive research and development into uranium enrichment before the agreement expires. another question, how iran would dispose of its existing stockpile of atomic fuel. possibly the biggest hurdle, iran wants immediate relief from crippling sanctions while the u.s. wants to remove them over time. republican l

mark albert has more. good morning, mark. >> good morning. it's looming large. while officials involved with the talks this weekend said the country had agreed to send it to >> reporter: they want them to keep provisions that would prevent the country from getting a nuclear weapon for at least a decade. in return they're seeking immediate relief from crippling sanctions. there are questions over a major unresolved issue whether iran will comply to ship all the rich uranium it produces to russia. here a debate continues on whether to roll out more sanctions on iran if a deal is not reached. >> when you begin to see all these leaks that probably came out of the white house in terms of what the iranian deal was starting to shape up to be, there's a lot of concern in congress on a bipartisan basis. >> the best way for us to prevent iran from obtain agnew clear weapon is by pursuing diplomacy with the community. >> they say closing the deal is like summiting a final peak. the final few feet are the toughest. even if u.s. negotiators are able to seal a deal by tomorro

mark albert has more. good morning, mark. >> good morning. it's looming large. while officials involved with the talks this weekend said the country had agreed to send it to russia, one of tehran's negotiators reportedly denied such an agreement. with a deadline less than 48 hours away to reach agreement on the framework of an iran nuclear deal, secretary of state john kerry is in switzerland where leaders from iran the u.s. and five world powersremain locked in intense negotiations. >> if we're going to get this done iran has to take a deep breath and make some tough decisions. >> reporter: they want them to keep provisions that would prevent the country from getting a nuclear weapon for at least a decade. in return they're seeking immediate relief from crippling sanctions. there are questions over a major unresolved issue whether iran will comply to ship all the rich uranium it produces to russia. here a debate continues on whether to roll out more sanctions on iran if a deal is not reached. >> when you begin to see all these leaks that probably came out of th

this is the company's first recall in its 108-year history. >> axelrod: mark albert in our washington newsroom tonight, thank you. we have a new study to tell you about tonight. what appears to be awe breakthrough in treating heart disease. this has to do with which noninvasive test used for high-risk patients. dr. hooman yaghoobzadeh joins us right now. what does this study tell us, doctor? >> well, we've never had a study that compares head to head the two ways that we typically work up patients who have chest pain. this study takes a look to see when somebody comes in with chest pain what, tests the doctor should order. one test is a cat scan which is a way to actually look at arteries and see if there are blockages and how tight the block are. the other test is a stress test which doesn't look at the actual blockage but looks at blood flow to the heart muscle. each test has its benefits and limitations and the results of this study show that both tests are very good at keeping the rates of heart attack and death at two years very are low. >> axelrod: how will this best be applied?

cbs news correspondent mark albert is at the white house. >> reporter: secret service agents mark connollysecond in command on the president's security detail and george ogelb.a. senior supervisor allegedly hit a barrier with their agency suv within the white house complex after a nice of drinking last week. another supervisor is under investigation for overruling junior officers, who wanted to give the agents field sobriety tests. >> any private citizen who crash in the white the house and had been drinking would be arrested, would be given sobriety tests. >> reporter: but these agents weren't. >> these agent were not. >> reporter: ron kessler is author of two books critical of secret service management. he says the the president appointing long time agent joseph clancy as new director has done little to change the agency's culture. in the past few months most of the senior secret service leaders have been replaced, director has been replaced and this incident still occur. is there still a problem do you believe. >> the managers that mr. clancy replaced have been replaced by other manager

people on board touched down hard during a storm, in halifax, nova scotia, two dozen were hurt, mark albert now on early result office this investigation. and just started to say, get out, get out, get out. >> past passengers scrambled to escape the jetliner before 1:00 a.m. local time, 624 was in the final seconds of a two and a half hour flight from toronto where passengers heard and felt the impact. >> there was, clipped the power line and-- >> and a piece of steel or something came up through the floor under my seat. i thought we were goners. >> reporter: video taken afterwards shows a downed power line hanging near the edge of edge of the airport. mike cunningham with transportation safety board said the plane hit a bright oranged antenna ray just before touching down. 1,100 feet short of the runway. >> this caused considerable damage to the aircraft and the main landing gear came off of that flight. >> reporter: air canada coo told reporters it was safe to land at halifax, international airport despite the snowy weather. >> the windchill was 20 degrees below freezing as 25 of the 133

as mark albert tells us there is disagree over how long iran will have to limit its nuclear technology>> reporter: with a deadline less than 48 hours away to reach agreement on the framework of an iran nuclear deal, secretary of state john kerry is in switzerland where leaders from iran, the u.s. and five world powers remained locked intense negotiations. >> if we're going to get this done over the next few hours iran has to take a deep breath and make tough decisions. >> world leaders want iran to agree to key provisions that would prevent the country to getting a nuclear weapon for at least a decade. in return iran is seeking immediate relief from crippling sanctions. there are also looming questions over a major unresolved issue whether iran will comply with demands to ship all often riched you're un yum it produces to russia. >> here in washington a debate continues on whether to rollout more sanctions against iran if a deal is not reached. >> when you begin to see all these leaks that probably came out of the white house in terms of what the uranium deal was starting to shape up t

mark albert, cbs news, washington. >>> a new technology service in cupertino. the mayor will unveil a new fiber service. he's partnered with at&t to make it the first city in california to get ultra fast gig power internet service that's one gigabyte per second. to give you an idea of how fast that really is, at&t says it will allow people to download 25 songs in a second or a full length hd movie in 30 seconds! that would be wicked fast as it were. >>> on this monday morning, a graphic timeline released on the final moments of that germanwings flight 9525. why french investigators are very upset. >> plus, the fight over robin williams' estate heads to court. >> from the kpix weather center, good morning everybody. rain on easter? we'll have the details. >> and we will go flying over one of our slowest drives right now. out of the altamont pass, livermore valley. we're seeing the usual commuter traffic. and then it really bogs gown near the dublin interchange. we'll have the latest on this crash on westbound 580 after the break. but first, we want to know what

i'm mark alberts on "air force one." >> announcer: this portion sponsored by voya financial. changing the way you think of retirement. >>> good afternoon. nice to meet you. >> good to see you. are you going to fly "air force one"? >> that was president-elect barack obama's first trip to one of the boeing 747 that backs "air force one." the current planes are getting old and the pentagon wants to buy new ones. we were given extraordinary behind the scenes-access with how they might come about. mark albert is here this morning. good morning, mark. >> good morning. they're looking to to purchase three in place of two. six stories actually two-thirds of a football field long and carrying immeasurable prestige. ♪ more than "hail to the chief," more than the ubiquitous secret service agents mean than the sacred seal there's nothing more impressive than "air force one." >> it eucon to represent the power of the american presidency, the reach of the american presidency and it's come to symbolize america's technology and prowess.

mark albert is in our washington bureau roerwith more on that. good morning. >> good morning. bach mcdonald launch add new advisory committee, tasked with more ways to speed up care for veterans while eliminating some of the hassles and famures that angered so many americans. surrounded by veterans and the people who care for them president obama said the v.a. has made progress healing broken trust but the job is not done yet. >> there's still more work to do, and this discussion allowed us to hone in on some problems that continue to crop up. >> reporter: arizona senator john mccain thinks the new mooi v.a. advisory committee does not go far enough. >> the obama administration has been slow and reluctant to fundamentally reform it. >> reporter: weightlifts exposed last spring led to dubious practices at other facilities nationwide. since then the v.a. said it has extended support for veterans, extended the clinic hour reduced the waitlist by 55% and changed leadership at 91%. and later this month they will stream lyme how they make follow-up veteran claims and appeals requiri

bit of rebelliousness, it occurred to me that everybody i've written about from steve jobs, albert einstein, mark another, drop out of school. maybe that's why i'm not invited to give graduation speeches or rebel or question authorities, or in steve jobs' words, they think different. it's that leap of the imagination that separates intelligence from genius. >> and when you start a project like this and i'm fascinated by your books and, you know jucht the exploration of people like einstein, that you would think are so difficult to dig down into what they were really working on. somehow you managed to make it translatable. what about leo nard do do you think makes it so special. >> the great thing about da vinci are the notebooks, for most of his height of his career every day he's doing sketches of horses he may want in a painting or rocks. at one point i asked martin clayton, the curator of the collection, when he was doing the sketch of water, thinking of it as a scientific engineering project or something to do with a painting like the moan ha that lisa he said i don't think leonardo da vinci

albert maysles was 88. >>> when we come back, 50 years since the turning point in one of our country's greatest struggles. >>> this weekend, the first family will travel to selma, alabama to mark 50 years since a monumental moment in the civil rights struggle. that day in 1965 while stunning in the violence inflicted on peaceful protesters, galvanized a movement. tonight, our kristen welker brings us the story of that march on selma as seen through the youngest eyes there that day. >> reporter: a painful past is coming back to life in selma today as people arrive from all across the country to remember what happened on this bridge 50 years ago. march 7th, 1965, bloody sunday. a group of activists risked their lives for freedom, equality and the right to be treated fairly. sheyann webb christburg was the youngest person there. she was just 8. >> rassism just unleash ood its brutality upon us. people had begun to be beaten down with billy clubs as if they weren't even human beings. tear gas had begun to burst in the air, and people had begun to run for their lives. i was running. trying to make my way back. >> reporter: she made it home that day, and two weeks later the marchers