If you missed the Academy Awards the other night. Alicia viklander, leo dicaprio won the oscars. The host, chris rock. Jumped into the controversy over the lack of black nominees. Kevin frasier reports. Will i am here at the Academy Awards. Otherwise known as the white peoples choice awards. Reporter chris rock wasted no time sunday night. Jabs at academys lack of racial diversity were expected from the moment the nominations were announced when it was revealed that all 20 nominated actors you realize if they nominated hosts i wouldnt even get this job. Rock kept the jokes coming, even out of the commercial break. Oh, were black. The broadcast politically charged atmosphere included more than just diversity issue. Dim. Caprio took home the oscar for best actor and took the opportunity to deliver a message about the environment. A passion of his more than a decade. Climate change is real. It is happening right now. It is the most urgent threat facing our entire species. Im the least qualified man here tonight. Thank you. Vice President Joe Biden walked on stage to a standing ovation and talked of speaking out against sexual abuse. Lets change the culture. Part of his introduction to lady gagas song till it happens to you. Till it happens to you you wont know how i feel victims of abuse filled the stage. Eat motional response from the audience was clear. Brie larson hugged each person as they came off stage. And the oscar goes to spotlight. Reporter the top honor went to a film with the strongest political message. Spotlight tells the true story of journalists at the boston globe who investigated the Catholic Churchs coverup of molestation by the citys 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 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. Anthony mason reports. Reporter the film archives of the museum of modern art curators are trying to restore a silent film classic. If you look closely you cant see it now. But you can see it is very scratched. Reporter the 1923 film, rosita stars mary bigford, one of americas first film icons. This is the only surviving complete print of the film. Yes. Katie trainer manages the collection. This print was 4 k scanned at a lab. And now theyre in the process literallying, frame by frame. Momas 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 film preservation. Raj roy says as momas library expanded it outgrew the museums new york city location. This sprawling Storage Facility was built in hamlin, pennsylvania. Cold in here. Very cold, yeah, all the belter tobelt 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 a film called citizen kanee 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. Old posters . Posters, ephemera. 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 winds 1939 premiere which includes a page on the black actors in the film. Awe momas work of restoring rosita in all will take two years. It will bring back a major Mary Pickford film also the first am can movie by legender edagerman director, ernst lubich. 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. Didnt renew the copy right on the film. The museum discovered a copy in the soviet union in the in horrible condition. Just too much for the technology of the time to handle. Reporter now rositas time has the finally come. And kerr wishes more films could be restored to the quality of Douglas Fairbanks 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. Projectors going only for another decade. But after that. We have to start dijgitizing this massive collection, a huge understaking. Make is my head explode. You feel like you are in a race . It is getting there. Dont think the seriousness of this has settled in, even in the archival. Movies are what america did best in the 20th century. Thats our defining art form. I dont want to lose one frame of that stuff. I really dont. An expensive septic disaster. But for only 7 a month, ridx helps break down waste. Avoid a septic disaster with ridx. Important message for residents age 50 to 85. Write down this number now. Right now, people are receiving this free information kit for guaranteed acceptance Life Insurance the Colonial Penn program. If you are on a fixed income, learn about affordable whole Life Insurance that guarantees your rate can never increase for any reason. 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Today you can do everything in just one click, even keep your toilet clean and fresh. Introducing lysol click gel. Click it in to enjoy clean freshness with every flush. Lysol. Yesterday was leap day. If you missed it you are not alone. February 29th comes around one every four years. Most of the time. Jamie wax has the confusing story of the extra day. Every four years we have to squeeze an extra day into february. Except we dont 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 days finest for her Birthday Party this weekend. Isnt she beautiful . She was born on february 29, oldest living leap baby. You made it. Yeah. Reporter the bash complete with an 80piece marching band was celebration of her 100 years. According to the calendar her 25th birthday. Daisy seemed to embrace the latter. Why does daisys birthday only come around once every four years . Do you know why we have a leap year . No. No. Probably something about the sun. The seasons and, global warming. I dont 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 son. 365 days. 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. Julius caesar realized the calendar wasnt working. Consulted with an astronomer. They realized what the egyptians discover. We need an extra day every four years to stay on track. He in to theed the julian calendar. Even that wasnt 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. 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 calendar one more time. So for example in the year 1600. Divisible by 400. A leap year. In 1700. 1800. 1900. No lope year. Year 2000 there was again a leap year. Lot of tweaking. Thats 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. 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 microscope. It is a cycle of 48 months for the leap year. We have a 48. 48 lobes. 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, its 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, its not every day one last thing to think about this leap year morning. If youve havent left for work. Consider just saying home. If you are a salaried employee your company is getting an extra day of work from you this year, for free. So why do i do it . Because i get paid. Und. On this side of the glove i know prostate exams can save lives. So, if you are a man over 50, talk to you doctor to see if a prostate exam is right for you. If we can do it, so can you. You could have seen this one coming a mile away. Google says it is partially responsible for the crash of one of its driverless cars. Last month in mountain view. A driverless lexus tried to 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 drivers cars are heading. We went for a ride with profess professor raj kumara at carnegie 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 . 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 people like me who work on the car is that somebody dough ploiz this technology prematurely and it kaus scauses 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 is called planning. Planning for near in fi that number of ethical scenarios like this. Suppose your car is approaching a headon 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. And used at low speeds perhaps where we dont about whether there is catastrophic collision. Back on the road oot carnegie melon, our driverless car takes a detour. Decided to take over. Yes, the system has been sitting quite some time. Evidence of the Autonomous Vehicle has miles to go. Thats the cbs overnight news. For some the news continues. For others check back with morning news. And krscbs this morning. From the Broadcast Center in new york city. Im demarco moore. On the eve of super tuesday, trump clashes with black lives 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. Thats five bronze stars, two purple hearts. Thats correct. And now the highest military honor of all. Announcer this is the cbs overnight news. No candidate will clinch the tuesday may generate irreversible momentum for Hillary Clinton and donald trump. Theyre favored in most of the 12 state primaries and caucuses. For democrats, a step towards certainty. For republicans, another jolt in the partys identity crisis. Polls show trump leading in at least six states. He is trailing ted cruz in cruzs home state of texas. The republican race, petty, profane and unprecedented now has prominent republicans candidate if trump wins the race became the weapon of choice today. 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. 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, im telling you. Theyre worse than the politicians. Trump makes a sport of criticizing reporters and makes it clear protesters are unwelcome. Out. Get out. Out. Trumps 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 dove into the mud. You know what they say about men with small hands. You cant trust them. You cant trust them. Reporter rubio is hoping for Strong Enough finishes tomorrow 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, thank you. All of this followed trumps 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 wizard of 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 dont know anything about david duke, okay. I dont know anything about what you are talking about with White Supremacy or supremacists. I dont 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 theyre hearing from him. He has won the backing of the neonazi website, daily stormer for example and American National super pac is making calls in super tuesday states. We dont need muslims. We need smart, well educated 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, trumps rhetoric is a coded appeal to racists. The idea that any mildly educated person in this country 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 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 make the deans list tomorrow. 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