spotlight tells the true story of journalists at the "boston globe" who investigated the catholic church's cover-up of molestation by the city's priests. >> this film gave a voice to survivors. and this oscar amplifies that voice which we hope will become a choir that will resonate all right way to the vatican. >> reporter: the first time a director won back to back oscars in 66 years. the biggest upset. a bridge of spies, not sylvester stallone won best supporting actor. best supporting actress, alicia vikander. mad max fury road, six oscars. real star of the show was chris rock. felt he hit it out of the ballpark. at the museum of modern art in new york city, film technicians earned an oscar of their own. they find and preserve classic films some 100 years old.

>> reporter: the film archives of the museum of modern art curators are trying to restore a silent film classic. >> if you look closely you can't see it now. but you can see it is very scratched. >> reporter: the 1923 film, one >> this is the only surviving complete print of the film. >> katie trainer manages the collection. >> this print was 4 k scanned at a lab. and now they're in the process of going through it like, moma's film archive is the oldest in the world. >> our little guy. >> reporter: so influential. in 1977, the academy honored the museum for pioneering work. >> this is our oscar. >> nice. >> museum of modern art, department of film. >> specifically for our work in

>> raj roy says as moma's library expanded it outgrew the museum's new york city location. this sprawling storage facility was built in hamlin, pennsylvania. >> cold in here. >> very cold, yeah, all the better to keep these. at this temperature, 35 degrees. relatively dry. we can keep these almost 400 years. >> reporter: this is just one of more than 50 storage vaults. for 25,000 titles. everything from experimental films to classics like "birth of a nation" and "grapes of wrath" and "the third man." >> a film called citizen kane on any many reels. keep them flat. dry. cold. having the analog storage version. the best thing. lets me sleep at night. knowing we have this.

>> posters, ephemera. record from distributors, studios. >> moma also archives those. >> these are all from the atlanta premiere of gone with the wind. >> reporter: like the studio scrapbook of press clippings from "gone with the wind's" 1939 premiere which includes a page on the black actors in the film. awe moma's work of restoring "rosita" in all will take two years. it will bring back a major mary pickford film also the first am director, ernst lubich. head of film preservation at moma. >> how does the film like that disappear? >> mary apparently took a personal dislike to it. for reasons that are still not completely clear. it seems she deliberately allowed the film to deteriorate. didn't renew the copy right on the film. >> the museum discovered a copy in the soviet union in the 1970s.

just too much for the technology of the time to handle. >> reporter: now rosita's time has the finally come. and kerr wishes more films could be restored to the quality of douglas fairbank's final movie, "the iron mask" made in 1929. >> this is a copy made directly from the original camera negative. actual film passed through the camera on the sets. >> reporter: even showing the films will become challenging. 35 millimeter projectors are no longer manufactured. and spare parts will keep projectors going only for another decade. >> but after that. we have to start digitizing this massive collection, a huge understaking. make is my head explode. >> you feel like you are in a race? >> it is getting there. don't think the seriousness of

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>> every four years we have to squeez an extra day into february. except we don't add an extra day every four years if that year is evenly divisible by 100 and also divisible by 400. if that sound confusing, it is. we decided to dig into what leap years are all about. started with one special leap day birthday girl. >> daisy bell ward appeared in sun day's finest for her birthday party this weekend. >> isn't she beautiful? >> she was born on february 29, 1916, making her america's oldest living leap baby. >> amazing. >> you made it. >> yeah. >> reporter: the bash complete with an 80-piece marching band was celebration of her 100 years. according to the calendar her 25th birthday. daisy seemed to embrace the latter. why does daisy's birthday only come around once every four

do you know why we have a leap year? >> no. >> no. >> probably something about the sun. >> the seasons and, global warming. >> i don't know. >> el nino. >> reporter: we decided might be best to consult an expert. theoretical physicist. why do we need a leap year? >> mother nature has a sense of humor. did not make a calendar when you go around the sun in 3465 days. what we learn in school. no, mother nature made it so every 365 days plus 5:49 and few odd seconds. that means that every year we have to compensate for one quarter of a day. after four years we have to add one more day. so when did we figure out the need for this extra day it? was bay back in 46 bc.

calendar wasn't working. consulted with an astronomer. they realized what the egyptians had already discovered. we need an extra day every four years to stay on track. so he instituted the julian calendar. even that wasn't quite right. the solar year is .242 longer, not even .25. when we add a full day every four years we are left with surplus of 11 minutes every year. that can start to add up. finally in 1582, pope gregory 17th. instituted the gregorian calendar we follow today. how is it different? i will let michio kaku explain. >> 11 minutes difference in one year, builds up. the pope had to intervene the

so for example in the year 1600. divisible by 400. a leap year. in 1700. 1800. 1900. no leap year. year 2000 there was again a leap year. >> lot of tweaking. >> that's right. >> luck we he have digital watches to keep track. it turns out, accounting for leap years is difficult for traditional watches. >> this watch has a wheel that turns one revolution every four years to accommodate the extra day. >> some body engineer a wheel. years? >> many of us have to adjust the gauges, end of february. protect the leap, perpetual calendar does that for you. >> to see how it works. we looked at one under a >> it is a cycle of 48 months for the leap year. we have a 48.

each lobe represents a month. >> reporter: it take is a year and a half to construct one watch. it will set you back around $85,000. you have four years to save up for the next leap year. around the world, leap year traditions vary. in greece, it's bad luck to get married any day of the leap year. up north. february 29th. the own day a woman can propose marriage to a man. for daisy, her birthday tradition has always been a nice dinner with family and friend. but this year was different. after all, it's not every day you turn 25. one last thing to think about this leap year morning. if you've haven't left for work. consider just saying home. if you are a salaried employee better pizza." which is why i'm introducing our new papa's quality guarantee: love your pizza, or get another one, absolutely free. pget any large pizza up to 5-toppings pfor just $9.99.

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of its driverless cars. last month in mountain view.

maneuver sandbags and side swiped a bus when it reentered its lane. no one was hurt. damage was minimal. peter greenberg got a look at the state of the technology. >> reporter: to see where driver's cars are heading. we went for a ride with professor raj kumara at carnegie melon university. where the technology was created over 30 years age for all the people telling us we are going to be driving, driverless car tomorrow, you say? >> just wait. the magic all happens in here. >> reporter: right. keep waiting. because despite all the technology and decades of research, the driverless car has a long way to go. >> the biggest nightmare that

car is that somebody deploys this technology prematurely and it causes an accident and some child dies. >> reporter: as disturbing as unlikely, a scenario on the mind of researchers and slowing momentum of autonomous vehicles. >> we as human beings are much less tolerant of an error a machine makes. >> gill pratt heads the research institute. global initiative from the manufacture the driverless car. >> how do you program decisions into the driverless car? >> what you are really talking about in artificial intelligence is called planning. planning for near infinite number of ethical scenarios like this. suppose your car is approaching a head-on collision. to avoid the vehicle, your car can move right because crossing the yellow line on the left is illegal. what is there is a person. or group of people to your right? >> these machines have ability to understand what is happening in the world much better than a human can. >> every time? >> the leading tow yo ta research at mit. >> whatever time it is reasonable. self driving can be used to day.

where we don't about whether there is catastrophic collision. >> back on the road oot carnegie melon, our driverless car takes a detour. on the eve of super tuesday,

matters protesters. >> get them out. get them out. out. out. out. out. >> also tonight, a cop is gunned down on her first day on the job. the big cheese at a food company pleads guilty to selling parmesan that had no parmesan. and david martin with an american hero. >> that's five bronze stars, two purple hearts. >> that's correct. >> and now the highest military honor of all. >> announcer: this is the "cbs overnight news." no candidate will clinch the nomination today, but super tuesday may generate irreversible momentum for hillary clinton and donald trump. they're favored in most of the 12 state primaries and caucuses. for democrats, a step towards certainty. for republicans, another jolt in the party's identity crisis. polls show trump leading in at

he is trailing ted cruz in cruz's home state of texas. the republican race, petty, profane and unprecedented now has prominent republicans talking of an independent candidate if trump wins the nomination. race became the weapon of choice today. major garrett is with the republicans. >> reporter: following the news that former kkk leader david duke was supporting donald trump, black lives matters protesters interrupted a trump rally in virginia. a "time" magazine photographer tried to leave the press area to shoot the protesters as escorted from the venue. he was thrown to the ground by a secret service agent. photographer chris morris admitted to cursing at the agent before the confrontation became physical. morris said the agent grabbed him by the neck and put him in a chokehold. >> i am dealing with some real sleaze bags up here. believe me. i think the press is worse, they're worse than the politicians. trump makes a sport of

it clear protesters are unwelcome. >> out. get out. out. >> trump's momentum towards the gop nomination brought a sharper edge to his already raucous rallies. marco rubio complained that gutter rhetoric makes headlines. >> what an indictment on the state of political debate in the country today. >> reporter: yesterday, rubio himself doech ve into the mud. >> you know what they say about men with small hands. you can't trust them. you can't trust them. >> reporter: rubio is hoping for strong enough finishes tomorrow to stay competitive in the delegate count. ted cruz is banking on a victory in his home state of texas. >> and we are i believe going to have a big chunk of delegates. i think everyone else will be way, way, way behind. at that point it will become abundantly clear this is a two man race. >> reporter: secret service interviewed the agent involved in the altercation at the trump rally. agency policy to protect the candidate

the photographer involved, chris morris said he will not press charges. >> specially not after the way he provoked the agent. major garrett reporting for us. major major, thank you. awful this all of this followed trump's responses to support he is getting wanted or not from the ku klux klan to. day, mitt romney said trump has been disqualified. here is dean reynolds. >> reporter: campaigning in virginia today, donald trump was boasting again. >> we have amazing endorsements, people that really mean, we have hundreds of people now that want to endorse. - >> reporter: praise from david duke, former grand wiz offered the ku klux klan may test his following more than ever. >> voting for these people, voting against donald trump at this point is treason to your heritage. >> reporter: last friday, trump seemed to say no thanks. >> i disavow. >> sunday he declined to renounce the k.k.k., duke or his support. >> i don't know anything about david duke, okay.

you are talking about with white supremacy or supremacists. i don't know. trump tried to clear up any confusion. >> i disavowed david duke all week long on facebook on twitter. he said a bad earpiece made it hard to hear the question about the kkk sunday though he used the same one for several interviews. in any case it is clear some far right groups like what they're hearing from him. he has won the backing of the neo-nazi website, daily stormer for example and american national super pac is making calls in super tuesday states. >> we don't need muslims. we need smart, well educated white people to assimilate to our culture. vote trump. >> reporter: southern poverty law center which tracks hate groups says the super pac was started by white supremacist american freedom party, trump's rhetoric is a coded appeal to racists. >> the idea that any mildly

could not know what the ku klux klan was is perhaps one of the most ludicrous statements we have heard in mainstream politics in many years. >> reporter: the super pac backing marco rubio put it this way. >> trump refuses to denounce the kkk. think about that? for president. >> donald trump has been heavily criticized before, scott, and so far, his support for the nomination among voters in the party of abraham lincoln has held firm. >> dean reynolds reporting for us tonight. thank you. >> the polls are pointing for a very good super tuesday for hillary clinton. here is nancy cordes. >> thank you. >> reporter: clinton said the republican candidates were behaving like grade schoolers. >> remember the little box that used to be on your kids' report cards. play well with others. i would have to put a big no. >> reporter: she is poised to

the latest cbs news battleground tracker shows clinton leading sanders by 20 points in virginia, 24 points in texas and 2 points in georgia. other polls have her up in tennessee, alabama, and massachusetts. and she is the former first lady of arkansas. that leaves sanders hoping for a strong showing in oklahoma. colorado. minnesota. and his home state of vermont. >> we can win. no question here in minnesota. if we have a turnout. the two have found common cause in their distaste for donald trump. when sanders called trump a hate mongor online, clinton retweeted it. but otherwise she has begun to focus less on him and more on her likely race against the republicans. >> one advantage i have is they have been after me for 25 years and i'm still standing. >> reporter: the state department is releasing its final batch of clinton's 30,000 e-mails tonight. but, scott, that does not mean

the fbi is still looking into her use of a private server and a federal judge wants some of her top aide to testify about it. >> nancy cordes with the democrats. thank you.

john dickerson, cbs news political director at the top of the broadcast we talked about the republican identity crisis. what's going on within the party? >> well if there was a wall between the republican party and donald trump it is 10 feet taller. in conversations with republican strategists and staffers on the hill they're at wit's end about what it would be look to have donald trump as the party nominee. what they pointed out in his interview is that he seemed to be trying so carefully not to offend anyone and call anyone a bigot when asked about the kkk and white supremacists. suddenly he got politically correct. what they think, republicans i talked to, he was trying to not offend any southern voters. so in super tuesday, tomorrow. what house and senate leaders are worried about, what is it going to look like in the fall when they and colleagues have to respond to every in send cendiary thing he says.

take the nomination away. or put a third party candidate in if he became a nominee. slip a third party candidate in there. hard to tell if they're more unsettled about being tainted by trump or the fact there is not much they can do to stop him from the nomination. >> thank you very much, john. in ohio today, a 14-year-old boy opened fire on classmates in a school cafeteria north of cincinnati. two students were shot. two others were hit by shrapnel. none of the injuries is life threatening. the suspect ran, but was caught nearby. there is no word yet on the motive. in virginia, the funeral is tomorrow for the prince william county police officer who was gunned down on her first day on the job. today the prosecutor said he may seek the death penalty. here is justice correspondent jeff pegues. >> reporter: 28-year-old ashley guchlt in guindon just beginning a new

first day in uniform would be her last. >> hold your traffic. shots have been fired. >> reporter: saturday night she and two other officers were responding to a domestic violence call at this home. as officers approached the front door they were shot. guindon rushed to the hospital. pronounced dead a few hours later. the two other officers are expected to survive. police say 32-year-old ronald hamilton opened fire on the officers with a rifle. hamilton a staff sergeant in the u.s. army is also accused of killing his wife, crystal hamilton in the home. the couple's 11-year-old son managed to run to safety. according to the army, hamilton worked in it at the pentagon joint chiefs staff center and served in iraq two years. prosecutors say hamilton had a previous run-in with the law but would not release details.

prosecutor, paul ebert. >> sad, sad, sad. an example of an officer's worst nightmare. >> officer guchlt ind indon in her high school yearbook wrote, live for something rather than dying for nothing. guindon, the 14th police officer killed in the line of duty so far this year. scott, 11 of 14 were killed by gunfire. a number that has risen dramatically compared to the same time last year. jeff pegues. thank you, jeff. turning overseas -- isis has been losing ground on the battlefield but striking back with a series of bombings in and around baghdad the past two days. more than 100 were killed. most at this park it place in a shiite neighborhood. isis is sunni. the other main faction of islam. the u.n. said today the cease-fire in syria is holding for the most part. a hotline set up by the u.s.

report violations has been ringing off the hook. the civil war left many of syria's cities in ruin. and elizabeth palmer got rare access homs, a city that once had as many residents as philadelphia. now just a fraction. >> reporter: after four years, and mega tons of explosives, the syrian army finally took back the city of homs from opposition fighters. but several rebel units escaped into the suburb of alwar where they tried to make a last stand. in the end though the violence was too much. under siege and outgunned, the rebels caved in and agreed to talk. they're just out of sight at the end of that road. the syrian army wouldn't allow us in. but nay do allow the women out to get medical care and to shop for food. what's changed?

negotiations going on with the government they tell me. life has improved. the siege has ended. and our electricity and water are back. supplies are flowing in too, though every single box is checked by the military. and every canister of gasoline probed for hidden weapons. but now what? in december, six busload of rebels and families struck a deal for safe passage out of alwar to opposition area farther north. that leaves about 1,000 left. stuck. still trying to hammer out the terms of their defeat. there have been several of these, call them stalemates, call them mini-truces across the country in the last couple of years, scott. they don't always go smoothly. some are more successful than others. but in the end, they all most certainly save lives. >> elizabeth palmer in the syrian capital damascus for us tonight. liz, thank you.

parmesan cheese. but it was 100% wrong. there is a new warning about a contraceptive implant used by hundreds of thousand of women. and the best of america. awarded the medal of honor. the "cbs overnight news" will be right back. can a toothpaste do everything well? this clean was like pow! it added this other level of clean to it. it just kinda like...wiped everything clean. 6x cleaning my teeth are glowing. they are so white. 6x whitening i actually really like the 2 steps. step 1, cleans step 2, whitens. every time i use this together, it felt like... ...leaving the dentist office. crest hd. 6x cleaning, 6x whitening

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if you love cheese, this news was pretty unappetizing. some parmesan contains wood pulp. then last friday an executive at a pennsylvania food company pleaded guilty to selling cheese that had no relation to what was on the label. we asked jim axelrod to take a look. >> reporter: you would think when fda investigators found castle cheese marketing 100% parmesan cheese it was actually 0% parmesan the company had a problem. >> the product that they were marketing which was on the label was not what they were selling. >> reporter: the u.s. attorney brought the case against the company after an fda inspection in 2012 found the parmesan was a

like swiss and cheddar. and in one case, an unknown ingredient. >> advertising it as parmesan and romano and putting something else so supplier could make more money. that's clearly fraud on the consumer. this was fraudulent in your view? >> yes. >> reporter: we found fraud might not be the worst of it. these fda record show finished cheese was stored in the unrefrigerated room which could cause back tear y er bacteria to thrive. the company found listeria in its production area ten times. but castle continued to produce and sell its cheese to stores like target and wal-mart without testing it. that might be troubling enough. if we didn't also find record from the pennsylvania department of agriculture which inspected castle around the same time as the fda. those record tell a very different story. in june of 2012, state inspector

condition. i appreciate the plant management and the quality work they do. his glowing reviews continued until august 2013 when he left the department of agriculture for a new job. director of quality control at castle cheese. >> i'm with cbs news. we asked trotter to explain reviews of castle but he declined. the market. the company filed for bankruptcy in 2014. the fda will be rolling out new food safety regulations, the fda tells us designed to get state and federal inspectors on the same page. >> jim, thank you very much. well, chris rocked the oscars last night. up next, how many people saw

>> if they nominated a host. i wouldn't even get this job. so you would be watching neil patrick harris right now. >> chris rock roasted the oscars last night on the issue of diversity. all of the acting nominees were white. and rock pointed out that's happened many times in the past 88 years.

oscar viewers were the fewest in eight years. george kennedy won an oscar in 1968 for his role in "cool hand luke" and fikts chur in xture in all four airplane movies and showed off his comedic side in the naked gun. george kennedy died yesterday. he was 91. the fda is iesh ugh the strongest warning abut assure, an implaktable permanent contraceptive device used by 750,000 women. some come plaend of chronic pain and bleeding. the fda ordered the manufacturer, bayer to conduct a

of removing the device from the today president obama presented the medal of honor to

david martin has his story. to call edward buyers a combat veteran doesn't come close. reading your uniform correctly. five bronze stars, two purple hearts. >> correct. >> how many combat tours have you done? >> i have none nine combat tours. >> in 2012, member of seal team 6 he was sent to rescue a man kidnapped by the taliban. as they approached the building the point man saw they had been detected. >> he saw a guard come out of the door. he shot him. and we started sprinting toward the door. >> nicholas czech went in first. he was shot and died. >> second person in. entered into the room. i saw another enemy standing there with a weapon. i shot him. i saw a person moving across the floor. didn't know whether or not that person was the american hostage or, if he was an enemy. so i moved down toward him.

when he heard dr. joseph call out from another part of the room. that's when high shot the person i was on top of. jumped off him. and on to the doctor, three or five feet away. >> why did you jump on the doctor? >> we did that. we are in body arm ore. want to protect him from any other potential threats. when i did that. i realized there was an enemy within arm's reach. of where we are laying. and so i was able to -- hold him against the wall, by grabbing him around the throat. and that was, gave enough time for our teammates to get in there and to take care of that threat. >> when you say take care of the threat? how did that work? >> our teammates came around and, they shot him. >> reporter: you were holding him by the throat against the wall? >> correct. yes. >> reporter: when it was over. five taliban. one navy seal, nicholas checque laid dead or dying.

how long did this >> took a minute to go in and take care of all we talked about. >> reporter: a lot of action going on in a very confined space. >> that's the nature of this job. close quarters combat. >> reporter: takes longer to tell it than it did to happen? >> yes, it does. >> reporter: now a medal of honor to go with five bronze stars and two purple hearts. you have to wonder how many other minutes of close quarters combat edward buyers saw in his nine combat tours. one thing for sure, he will never tell. david martin, cbs news, washington. that's the "cbs overnight news" for this tuesday. for some of you, the news continues. for others, check back with us a little bit later for the morning news. and, cbs this morning. from the broadcast center in new york city.

it's tuesday, march 1st, 2016. this is the "cbs morning news". >> super tuesday. a cross roads in the path to the white house. millions of americans will vote today and determine the future of the presidential race. >> he thought that i was doing it for publicity and attention, and that ripped me apart. >> tearful testimony from erin andrews. the sportscaster tries to win a $75 million lawsuit over a nude video secretly shot while she was in a hotel room. fender bender. for the first time, one of google's self-driving cars causes an accident. why the tech giant says it's only partly to blame. and storm survivor. a fedex driver lives to tell how