The zika forest in uganda in the 1940s, is linked to serious birth defects. Dr. Jon lapook has the latest. The zika virus. Reporter today the World Health Organization sounded an alarm about the zika outbreak. Director margaret chan. Questions abound. We need to get some answers quickly. Reporter the organization will convene an emergency meeting monday to plan its response. The zika virus, which is linked to children being born with small heads, poses several challenges. Right now diagnostic tests arent perfect. Theres in treatment, and theres in vaccine. Dr. Anthony fauci, head of the Infectious Diseases branch of the nih, says the outbreak is a pandemic. You have multiple down fris in south america and the caribbean, so by anybodys definition, that would be considered a pandemic. Reporter theres concern the virus will eventually be found in mosquitoes in the u. S. South america and in the caribbean, sooner or later were going to see a local transmission. Reporter fauci says controlling mosquitoes that could carry zika is key, and the United States has one big advantage most of the United States goes through a real winter, and thats very, very important in containing mosquitoesborne viruses. Reporter 35yearold ana palazzo is pregnant with twins. Two months ago she cut short a trip to brazil and returned to new york. I want my babies to be safe, and i was very anxious about it. I didnt feel safe there. Reporter dr. Fauci says were not likely to see the same widespread zika Virus Outbreak here in the u. S. As in brazil. We can better control mosquitoes, but, scott, there are a lot of unknowns, and the Health Care Community is watching this very carefully. Pelley dr. Jon lapook. Doctor, thanks very much. Donaldr trump is a master of hes aiming to run away with it. Tonight as seven republicans debate in des moines, he is holding a simultaneous event billed as a veterans benefit. Its a highstakes gamble in his neckandneck race with ted cruz just four days before the caucuses. Heres major garrett. Reporter in South Carolina last night, donald trump played up his counterprogramming move against the fox debate. From here where do i go . Iowa. On to iowa. What am i going to do there . Who the hell knows. Were going to. You know what were going to do . Were going to raise a lot of money for the vets. Thats what were going to do. Reporter fox news scrambled to pull trump back on the stage, using bill oreilly to plead its case. Forget, go forward, answer the questions, look out for the folks. Just want you to consider it. Reporter the Trump Campaign has not said what veterans groups would benefit from his event tonight, but some have said thanks but no thanks. Progressive vote vets dot org. Veterans are not a political prop that you can trot out and exploit because they dont want to answer tough questions. Reporter trumps top competitor in iowa rid yuled the g. O. P. Frontrunner. He doesnt want to answer questions from the men and women of iowa about how his record doesnt match what he is selling. Reporter Chris Christie faulted trumps hairtrigger temper. This is a few days before the caucus, and the candidate leading in some of the polls decides in a snit not to come. Thats not respectful and its certainly not president ial. Reporter rand paul has clashed with trump before. Hes already hedging his bets because hes used to buying politicians. Well, ive given him plenty of money. Reporter he predicted more time tonight to shrinking the size of the government. Im concerned about the debt. Im concerned about the government leaving us alone. Reporter jeb bush running clicks to hope. Can jeb bush be a surprise story on caucus night . Yes, because the expectations are so low. Well, you have succeeded there, governor. Mission accomplished. Reporter rumors have run wild all day about a possible lastminute truce between fox and trump. Scott, moments ago Trumps Campaign manager told us, mr. Trump is not participating in the fox news debate. Pelley seems clear. Major garrett, thanks very much. By the way, cbs news will be carrying tonights trump event on our 24hour digital news service, cbsn. It is available on all devices at cbsnews. Com. And cbs news will bring you the next g. O. P. Debate. Thats saturday evening, february 13th, live from greenville, South Carolina. John dickerson is the moderator. Now to the democrats. With a newspaper. Heres nancy cordes. We should move to a medicare for all single payer program. Reporter his unapologetically liberal views attract supporters by the thousands, but in a stinging takedown of bernie sanders, the Washington PostEditorial Board called it an act. Mr. Sanders is not a brave truth teller, they wrote. He is a politician selling his own brand of fiction by obscuring the true cost of his generous proposal. Do they have a point in do voters deserve to have more specifics about how much more in taxes they would pay in a Sanders Administration . The answer is voters deserve as much information as we can possibly give them. Reporter senator sanders has released some details. Hed finance Free Public College tuition with tax on what he calls wall street speculators. Hed finance his medicare for all Health Care Plan by charging businesses a 6 incomebased individuals would pay 2 . You think you can convince republicans to raise taxes . I think we can convince the American People in the year 2016 all of our kids should be able to go to public colleges and universities tuitionfree. Reporter the editorial plays right into a case that clinton makes that Campaign Events like this one all the time. She argues that his ideas look good on paper but will never work in the real world. By now, though, scott, roughly half of Iowa Democrats are siding with him. Pelley nancy cordes on the trail in iowa. Nancy, thank you. Today teachers in detroit sued the School District over what they say are unsafe conditions. They had been staging sickout, forcing most of the schools to close. Adriana diaz reports that many parents are with them. Reporter after weeks of protests over dilapidated kindergartners are wearing coats, detroit teachers and parents say a lawsuit was their only remaining choice. Ivy bailey is interim president of the Detroit Federation of teachers. Educators have been snubbed, ignored, disrespected, and punished when they informed the School District of specific safety and health problems. Reporter the teachers cite mold, mag yachts in bathroom, mice and mushrooms that once sprouted in a classroom as common problems. Todays complaint states that schools are risking Childrens Health and safety. It says some students have suffered from respiratory illness, Chronic Fatigue and stomach pains. The lawsuit demands repairs and the removal of darnell earley, the governorappointed schools emergency manager. Last year he went from being the emergency manager of flint, which is now having a contaminated watered crisis, to managing detroits school system, which is half a billion enough is enough. Reporter Shoniqua Kemp and two of her children are plaintiffs in the suit. She blames earley. This emergency manager stepped into a situation where there is no money. Im not a millionaire, so sometimes i have to find ways to shuffle my money around the make things work. He went to school for this. He signed up for the job. He should at the very least do it. Reporter earley denied our request for an interview, but in a statement he said he is working to reduce the School Systems debt. Scott, he has 28 days to respond to the lawsuit. Pelley adriana diaz for us tonight. Adriana, thank you. Another rickety boat today filled with migrants sank off of greece. 25 drowned, ten of them children. The harsh winter has not slowed migrants escaping war and poverty. Volunteers are rescuing as many as they can, and Holly Williams set sail with them. Reporter they were so desperate the reach europe that abandoned their inflatable raft and stranded themselves on a cliff on the greek coast. Winter is normally the quiet period here on the greek coastline, but this year the rescue teams have been taken by surprise, because in january, around 50,000 people made the dangerous crossing. Thats over 20 times more than last january. And this months death toll is now more than 170, including some who tried the make the risky voyage at night and drowned when their boat capsized. A swedish team came to the rescue of the people stuck on the cliff. They fled syria, iraq and iran and amongst them was a tiny baby and a disabled man who was in the safety of a rescue boat, Behzad Abbasi comforted his oneyearold son ermia. He told us hes a christian and he and his family risked death to flee religious persecution in iran. 50 50. Maybe you win or maybe you lose you life. Reporter the swedish rescuers are funded by donations, and theyre all volunteers. Joakim brosten normally works in i. T. This is my way to give something to people that are in need. Reporter the swedish team found these migrants safe on a greek beach, but so cold they lit a fire fueled by their life jackets. There will be people coming from the landslide, and they will come and support you within the next few hours. Reporter as politicians try to stop the migrants from coming, ordinary citizens are dealing with a more pressing Holly Williams, cbs news, greece. Pelley 3 years ago today i picked up this press pass at the Kennedy Space center for Shuttle Mission 51l. I remember being amazed at how cold it was, and it would turn out that americas first inflight space disaster was triggered by a simple rubber gasket that had frozen overnight. We thought space flight was so routine there was even a schoolteacher aboard challenger, but in a flash we were reminded, astronauts are heroes for a reason. Manuel bojorquez looks back. Reporter the seven astronauts prepared for liftoff that morning at cape canaveral, florida, in front of a national audience. Mission specialist ron mcnairs wife cheryl was there. There was a lot of excitement and there was camaraderie. Hey, this is the u. S. Reporter it appeared to be a textbook launch, but 73 seconds in, a seal failed on the right rocket booster, causing a catastrophic explosion. Obviously a major malfunction. Reporter confusion on the ground soon gave way to grief. What happened . Whats going on . Report ron mcnair had flown on the changier before. In 1984 he became the second African American in space, inspiring americans with his saxophone playing in zero gravity. Two years later the father of two was gone in a national tragedy. Today the members of the challenger crew were pioneers. Reporter what was that like to have a nation mourn with you . That was a beautiful part of coming back from all of this tragedy. Reporter mcnair honors her husband by encouraging children to study science and technology, the same skills that helped a man from humble south see the earth from above. And he described it as just so beautiful and appearing without divisions or lines, peaceful, he said, as he thought the lord meant for us to live. Reporter here on earth in a grove dedicated to americas space pioneer, words worth remembering. Manuel bojorquez, cbs news at the Johnson Space center in houston. Back. Every insurance policy has a number. But not every Insurance Company understands the life behind it. For those whove served and the families whove supported them, we offer our best service in return. Usaa. We know what it means to serve. Get an insurance quote and see why 92 of our members plan to stay for life. 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In recent years the iconic mattel dolls have remained on the shelves. Barbie sales have now declined eight straight quarters. Mattel cites one possible reason. We were hearing that many thought barbie was out of touch. Reporter that t tically blondehaired, blueeyed doll with unrealistic proportions is getting a reality check. Mattel recently introduced 23 new dolls with different skin tones and hair colors, and today three new body types curvey, tall and petite. The character feeds the horsie. Reporter mattel took the new barbie e r a test run with a group of four or five year olds. They dont look like barbie. Some of them have brown skin and white skin. Reporter but what they noticed most were the different shapes and sizes. Im glad because we all get our barbie that looked like us. Reporter the nexex step foror mattel is getting parents to buy in. Barbie used to look. We live in a world how barbie is now, so i think its a really good thing. Reporter barbie may be ageless, but to her creators it was time for a listening long overdue makeover. Mireya villarreal, cbs news, cacafornia. Pelley a whihi man has been casto play Michael Jackson. Thats next. It dont matter if youre black or white your body was made for Better Things than rheumatoid arthritis. Before you and your rheumatologist move to biologic, ask if xeljanz is right for you. 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. Donstart xeljanz if you have an infection. Tears in the stomach or intestines, low blood cell counts, and higher liver tests and cholesterol levels have happened. 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Thats my lover reporter that has some criticizing why thth role of the king of pop is being portrayed by a white actor, joseph fiennes, in an upcoming british tv movie. Im as shocked as you might be. He definitely had a pigmentation issue, so he was probably closer to my color than his original color. Reporter this latest controversy comes after no actor of color received an oscar nomination for the second year in a row. Untie him. Reporter idris elbas role in beast of no nation was thought to be a likely nominee. He recently told the British Parliament about the racial Glass Ceiling i knew there wasnt enough yet for the industry to see me as a lead. Reporter black or white, fiennes says he hopes his performance passes. The more i looked at michaelel the more i fell in love with him. Reporter this isnt the first time filmmakers have cast while actors to play people of color. Recently apologized for its lack of diversity in an upcoming movie about egyptian gods. Pelley vlad, thanks very much. And were coming right back. This portion of the cbs evenininnews is spopoored by liberty insurance, see Car Insurance in a whole new light. And then you totaled him. You two had been through everything together. Two boyfriends, three jobs. Youre like nothing can replace brad. Th