>> p p p tikht's replica debaba takes on neurgency. could bthe last chancto catch ump foreext wewe's's supetutuday. alal tononhthtelizabeth palm tausidsyririatat turning t t he c w w. reporr:here is s rtaiy no cease-fe here at the moment, and the's not going to be any time soon.n. >> ple dayght reveals the destruction done ba night of olent storms. and ll this s ea take off? pls s r a wide body aircraft fowidedeies. >> at the end of theheayit's all abt making money. ptioniponsed by ss thth is the "cbs eveningews"

pelley: tonight, thehfive republican presidentialnt candates are holding theheef final dedete b bore super tututuy, the 12 primaries d caucuses that could be the turning point. r me iightor rvivbufomina donana t, is exctct td draw most of t firtotoght,and now his reve n e.mar gaft ie ba us mar? eporter: scott, repuicans here a agree-- tonigigould one of thlast c cnceseso d ump'momentum fore key contests isrepublan r rals' home state.pu a new poin texas sho ahehe, anjoashh habeeaea iio. but other poll p p marar rub ll behind trump his home state of f frida. toy, t tmp foced on a different republican candidite, one erom f fr years ago.o. the fe between m)]t@t@mnmn and donald trump started yesteay when romney repepeed his call

retus.s. trumthen took to twitter t cacaomney one of thestst g.o.p.didates s er and a dope... trump p so tweweed a p pture off hihielf sisning g at he e id was a rerent tax return. the caption, "isn't thisis ridiculous?" the tax issue bedeviled romn in t t 2campgn aft demo senate adry2 reidade a simir claim what r rney is now sayininaboutla trump. >> theord'd't that he hakm w w paid any taxes f/r 10 years. let him prove that he has papa taxes, because h hhasn't. >> repepter: the accusation was later debunked. l for h)papapatrhahaboasd tries to ke h h tax bilil low. >> i fight likhe non to payot taxes.s. te the way the govovovent spends my momoy. repr: a a anoteon twitter that"taxeturns have zero t tdo with somee'e'net worth." romney's response, "me thinks the donald doth protott too much." ump's g.g.p. rivals s o rubio and ted d d have both

returns.s.ir >> they'y' just t veve exoxoc, but we will release them, sure. >> i haven't m me e ough moneyy thaty tax returns are not that terereg. >> >eporter: donald trumu is on a ththe-state winning street and wowo60% of the d degates awarded so far. tuesday presen the biggesthaul ul o ol-- 595 delegates, justnder half of the amount quirir t secure the a a republican n nination. >> pelley: majaj garartt, for r tonight. major, thank y very mumu. the e xt democratitidebababa i spould s primama, is saturdaya in south carina. here's nanan cordes.r >> we e uljust turn this intnt vival. >> reporter: hillary clinton'snt inner eacher came out today as she courted d ack k owds in south cacacana l country. >> i think we need more siniing, doyou? i singngecauau i'm hap.. m i sing becau i frere foc >> reporter: i imichiganbernie sasaers was focusese minorities, too, meetite witdent sides in watertricken flint. >> p pple e re coming`sa, "this water is brown.

continued to ignore it.>v repepter: nejther cdididi can win theelegate-rich super tuesday states withoutminoritytyup.. 200 african ameririneicic p lf of f e deatelectotin alabama anan georgia,a, nearlrla thirin virginia anb tenenenee. a 32% of democratic voters i tetes wererepanic. >>hen you have pple likeeo trump sasasa that mexicans are rapists or criminans, that is ex trage. >> 2eporter: new national poll finds clinn leleing sanders among g spanic voters s a margin of two to one. she has a similar eded african mericans ough her husbandnd crime ll hasasn a sticking point for someme two acaclives matters estetsnterrupteded clinton fund-r-rser in charlesn laststnt night.es >> reporter:r:he protesters were escorted out, and clinn r said she w sorry forome e the terms she usedn thth90s,

"super predars." she was using the term to describe violent young gang members, but now, 20 years later, says it was a poor choice of words. both clinton a a sandede wto refofo the way drug es, , rticular, are ndled, scotttt beuse they sayoo my yog blks and latinos are endg behind barar pelle nancy cordes. k u, nance. this evening, president obama med prprress against tt isis terrorist g gupn sya. saiat isis has st 40% itstserritory, , , the pay of w ittrowhs, and is reduced tot using civilians as human shields. but the wider war in syria is not going mr. obama's way. amican-backed rebe are on e run. ththforces of the sadd dictatorship aredvancing for& the first timen years because of russian air suprt and anian troops. intn syr, buour elizabh

adadnce todathroh anapocyptic nd >>ter:r:his ed tbe a nenehborlrod. w it's a battltlield where the syrian a ay says it'y gogothe enemy on the runun there's just been an air strike behihi me.e. we're about fiveveiles from the cefeer o odamascus, and e syriri armrmis tryinin car this suburb ofofppososion fyghtete.% ththe is certainly no cease-fire here a athe moment andndherere not goininto b bat any time@ soon. solmer, one of the syryrn soldiers, take us to see the buildings half a mile e ay whereof he says the rebelslsre n n hiding. overhead, we can h h hthe licopters scouti their taetet theh.... ( explosion n what are they hihiing, solmer? "they're terrorists," he says. those ararbarrel bombs?

nisters filled with explosives rolled out of f choppe they're eap but hoibly inaccurate. and e there any civilis leftft over tre??? "no,o,he s ss "only fighte," "ut there are fighters' famies, , o, cowere under the a aacks. arby, , , nter tunnene the soldieie sayayere dug by fighters with the al qaeda- linked al-nusra frfrt where they hid and fought for years. neral youssuf, the m i charge, leads the wathrkrkh ruins heow controls. you're stililisisi air strikes in t suburbs i iorder fight nusra? "yes," he says,p,pecau thehere dangerers for sysya and ththth t world so we'e' justifiededed usinany aps that are legal. t thatateansnshat t en thihi over-s-setched and undertrained

but the truth is, scott, that by b now, all sides in this war ahi completely exhaustst, and likely ait sounds, just aa le osubus over, the army has actually reacbed a miniiua trwith the rebels s p llowow od a supplies reach %civililis. >>elley: elizabethalmer with rare firsthand reporng inside syria toninit.yria elizabeth, tnk you. todada theheirector o& thehe f.b. said that h bate e th apple isishe toughest fight hehe faced in governmt.a federal mamistrate ordered apple e unlock the e hone o o onof the san bernanaino rrists, but toy, appleha told thert thaordedeis dangerers. f jeff pegues has morere >> reporter: in its filing, apple saysyshe f.b.i. seeking a dangerouweweand that itce would be forced to dedice siat to 10 apple engineers to create new code that apple calls ene

apple saididhere would even have to be a governnt f fensic labre on company grounununhat t uld bet used to open hundreds of other seized devices in law enforcement's possession. applplsays: the coany eves the casepe triggersst amemement protodtind writingngpr couter code is equivaltoer freeeepeech. >>his is the hardest qstio q i have seen inovernment. >> reporter: f.b.i. direct james comey assud meers of congress today that the epreau only wanted accesssuo the iphone used bsan n n ardino terrorist syed f fook. mey yaid the f.b. is standingngn firmegrod, but cocgre needs to set thre limits on how far government inveveigators can go. >> i i hugugfan of privacy. i love encptptn. it's a great thing. but our need for public safety d our need for privavavare crashingnto ch o oer, anan we've goto sort that out as a

congress should have a bigger le in this debate, b b, scsct, the c urt se imoving% rward. gogole and facebooooare expected to file legal rsrsn suppt apple >> pellele jeff pegues for uss nigh jeff, ank you. tornadoes in severer states sterday killed at least four people, including three waverly, virginia, where we fi ch reid tonight.t. >> man, it'sn exe^rience, man. you got to experience it to talk ababt it. >eporter: vince donond was abouto s dn right he to wawah tv w wn the totoado d into his mobobe home, riff the roof anthe wall.. do you feel lucky tototoaliv >> i'm not lucky. i'blesd.d. b>> reportrr: b b theheornadodo toto h nbor's mobile he i ioundndndndanan i i sasag g"ross a highwhwhw two-o-ar-old, his father, and d otr n n ed. thr bodiesnd otherebriew re found 300 yds away. mehoho t ther surved with seous injuju. in nearby appopottox, rginia,

buildings were damaged after funnel cloud left ananighthtile path of destructio leaststhree tornadodo were rerereed inortcarolina. in oxforor parts of this farm were leveled.. ininennsylnia, a tornado ripped through amish countnt, hitting structurur in narvon. a torrential dowowour lead to flasasflooding in and around washington, d.c. in the new york area, a gust ofor wind sent this truck airbornrn and, s stt, ke a looat t t off queeee, new w rk, 12-f-f-f waves capsized aoast guard boat as it was ting to rescue fishermen ononnother vessel th had run aground.d. and back here in waverly,n virginiayou're looking a aa photog o ia-plus tires before the tornado. now you'u' look at a-plus tires aftethe tornado. this was the garage door. thatp there is the metal thatthth s once the roof.oooo

what happens when a tornado meets a building made of sheet metal. >> pelley: and we nt to point out no one was injured a` the ast guard inindentoday.. chip, ks very mumu. the world's s petioruc rtablectrwnics@has trxrxrred hu d dand forr chargeable batteries, but many ofofhese batteries are now bursng into flames in placesbu you would lelet expect. vinita nair is looking io this. >eporter: when the fire firstem igted, employees at thuc kentuc gasaststiti thought itom was a bomb. turned outo be an eat garette that exploded in josham hamilton's pants.re heuffererethird greensns it's j%zt the latest inciden involving defective liliium ion babaerieat pow e- cigarerees. 22-year-old evan spahlingeha totoe placed in a medicacay induced coma for three daysr after one of theblew up is mouth. >t's an alternativeveo smoking cigarettes. it's supposed to be a safer and a healththr wawaof doing it. >> rfporter: the same battety cells that p#per eigarettes,

nce e cember tre have bebeoard 52 repororinindents invoingg52 hoverbrds catching on fi jay whitacre is a profesr carnegeg m mlon univsityty he said the demand to make these products cheapap andore powerf has led some compies cututorners. >> what we're e eingight now s is a situauaon where maybe some of these batteries are simply nomade to the sasa standara2as baery that are made say, at sony y panasonic, which have much more stringent quality control. >> reporter: whitacre sasa if ium-ioiopowered itits like rettes and hovererards a considerer high-power applicatioioioio ififir b b bries are badad desiededhen n ey arereharg th can orheat. is it something g at the usur isis ing incorrrrtly? >> no. f in genal, withthhis nd of technology, it's v vy difficulte user t tbe a4afault.

lde a goododkahat ehcell lives in.ecbof e e ininhod bebe sisied to prott ththusus >> reporter: industry advocates say these incidents are still rare and t tt ususs shld always use`eompatible batteriess anchargers. thth say tavoid bttery contact t th metal oects, scott, sucucasasoins,`ys, jelry.s, >> pelley: vinita nair, , ank very much. ths a pl to o ve wider airirir ssengers wider seats. 'l'lgeto t t bottom of it. and a younunfan gs quite a gift from a legend when the cbs even news continums. go, , go, g/g/go, uchdown!n! choir and harp music. this place, it's the b bt-kept secret in n&otball mince. hey,y,ow did he get in here?! and wi t/t/tail fungus! git it! with jublia. jublia is a prescription medicine used treat toeoail fungu use jublia as instructeded by your r ctor. w 's prime time.

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person, like two pentstsnd two small children.>> >> the airlines will csider anythina that allows t tm to makeke buck. >> reporter: ben mutzabaugh is theditor o"uotay's" "t in thlog. >>en notng else in the e e stryrytheyeyey very clever about comimi up thge wa to sell seats to passenefrs, prcicily when they can chargegeore for either seats that are better or forts thatre less awawl.@. >> reporter:irbubuprevevusly sought patents for a desnn stacking passengers and this se-standing concept. seat maker zodiac created axagogottern whwhe e mimile seat faceshe passengers in thehe aisle d wiwiow while addg upup to 30 0 re passengers s@r ple. tennnnsee e ngressman stephen cohen rries a seats could jeardize safety making it hard to evacuate withinhe required 9090econds as seen in thth video. he's authored a bill reqring a ththf.a.a. to set nimum at- size stataards. >> if peoplean't getetut of an

ey@lostheir lives. houldn't be after r accident.ft afteththe's an accident, it'ss o late a a people are dede.>> r rororr: the big question now,cott, will an aie sayyy theyt thesesseatatd d ll safefe regegators ever allow them to be inslled in a plane? pelley:s van clve, ank you,u,ris. what's killing pyersn the n.b.a.? what a new study has found next. stock k ices, earngs, and divides...., an eititsummary y ore th cononlidates the stock ratings ofofop analystso a sing score...... and $7.95 ne u.s. equit]rades, lower than td ameritrade, schwab, , d e-trade, you alize the smartest investing ideaa isn't juststt inveve in,

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if you have sytoms of an allergrg reaction. symptoms may include rash, swelling, and difficulul breathing or swallowinin tatang jardiance with a onurea or insulili may cause loloblood sugar. ll your doctctctctut l the efdicines s u take and if you have anan medical nditions. so tk to your doctor, ananfor details, visit jardiance.com. i'm jerry b%ll the sond. and i'm jerry bell the third. i'm like a big bear and he's my little cub. this little guy y nontop. he's alwlws hanging out w)w) h h friends. yove got to be prered sit

ere's no "deep couch sitting." definitety not goofor my back.( thisiss the part i really y n'n' like r rht hererfr (d(drb whatat thah? paage! it's a swier wetjet. it almost feels like it's moving itlf. thisiss kind of fu.. that comes from my flolo? eww! is i ideep couch sitting. [jerfr b bl iiii deep couch sitting! >> pelley: heart problems account for three-quarters of spor-related d dths in young athletes. now, a newewtudydy help saveveay live a here's dr. jon pook. ortete two years ago, isaiaiaiustiwas one`ofofof tion's top college basketball player then, a physical befororthe n.b.a. draft revealed a hearar oblem, ending s career. i iust didi't know at to do with it, but it t s juju-- you know, juju accepting it, acceptininthate and healal more importananthth a game. >> rortete in the u.u., -related sudden cardiacn

baetball players.ig one big question is what's a no heart sizizfor these athletes? to fint, dr. david engel and colleagues revieieiethe heart trasasnds of m me than 500 n.b.a. players. when you first saw them, you thght these are big hehets. thesepare abnormal?( >> the first instinct is to say these hearts are earge we'r' t used to seei hearts for peoplehat are this big the average n.b.a. player is 6'7" and the average weight isis 222 pounds. >> reporter: i itus out, like y other r scle, the het getsts bier with exerci, althoughdh the hearts of thn.a. players were about 10% thicker than norm, that wasot felt toe dangous. the researar estlilies a sesese f doctoto going rward. d how does this help us? >> thihishould help us distinguish those changes from dangerous heart condns t ttda can lead to sudd cardiac ath. >> reporter: i iaddition, they found that the aortatathe major

d kning that wililillplpith future diagnosis. scott, dr. engelelays this is now a model r evaluating athletes in other sportsts >> pepy: j lapapap thank you very much, jon.. well, soccer's biggest star came ththugh with heart today for his biggesesfan. n. a ve-y-yr-ololwas photogphed wearing a lionen messi shirt made from a plasasc bag. it wene online and messi sent him an autogogphed shirt from argentina's national team. the bag has been retired. upt, a math teacher'r' formula for succccs s aithe odds.a foro s scess against the ds.. so let's start talking about your long term goals. knowing your future isisboutut rerehan st y y. 's how eard jones makes sense of investing. . foadultt with an vancnc lung cancer called "sqsqmous non-small cell",

it's not every day something this big comes along. a chance to o ve l lger with... . $ vo, niluma opdivoe firs d ly immunotrapy fda approved based on a clininil trial demonsating longer life... ...for these patients. in fac opdiviv significantly increased the chance of living lonr veveus chemothehapy. opdivo os fferent. it wor with your immune sysysm. opdivo can cause eour immuneystem to atback noal orgs snd ssues s your dy and affect how they work. this may happen any time during or after treatment has ended, and may become serious and lead to death. see your docr r ght ay if you e eerience new w worsening c cgh; chest pain; shsxtnesesof breath; diararea; se stomach papar tendererss; re nausea or vitinin eme eatie; constipation; exexssive thirst ourinin swollen ankles; loss of appetite; rash; itching; headachek confusion; h hlucination

om becoming more serious.. these are not all thth possibleide effects ofofpdivo.o. ll your doctor about a a your medical cditions, including immune emroblems, or if youove had ann orgatransplant, or lung, breathing, or,liver p pblems. a chance to live longer. ask yourururtor if oplpvo i iright r r u. bristol-myers sqbb thanks t patients and physicians whwhpaicipated in t t opdivo clinicrial. i take pictutus of sunrise it's my job d it's also my y ssion. t with my back pain i couldn't sleep... i couldn't get up in ti. then i found alele pm. alpmpms theonly one to combinesafe sleep aididplus the 1 1homrmr pain relievengtgstrength of aleve. and now... i bacac

>> pley:y:e entoght th a lution to math proem thathas stumumd the e stinds vor ceuries.

sucseed calculuhere'seya llllreal. >>eporter:r:rom m e outside, ncoln hi s sool does notot lo la plat inkpireregvgvtns. with gates the windows, in a tough east a.nehborho.. tay iall about makiyour lifea.@ >>%rorter: b loobeyo allll of t aou'l'lfi thisou n, antntny y. thiislmossilar this ght her rigig? epororr:he s okoreanan immiantstsyom tehes wh is considered the harde class inid scol, advanced placement cplculus. >> one o omy s sategie really to makaksure to ove that vironmenenwhere re not shshed of asking qstions.. do you i i >eporter: his approach to teaching goes beyondalcucuting the slope curur. yom makes his clcls meet after schohooneekendnd even sc holiliys thhard work has s id o o. >> it's not always fun, but i do know for sure, once they get the score and if i ask thehe "hey, was it worth i i" erersing ene of thth say itt was so worth it.

a row,very studentnthat has walked into his class has passed the a.p. calculus test. and this year,r,ne sdent, cedrick arguet got every question right. >> his style of f aching commands respect a hisisis personality is very likable. he gets to kw hihisiudts on a personol level. >> repter: what is the secret s here? >> ty know thahai sierely care about them, a i is prpr fothem. >> r rorter: with ve? yeah, with ve. >> reporter: cedrick arguetand yom were both ordered by the l.q. school board and president obama ted cedrick to whe house ience fa the 17-year-d was to go to cal-techchnd become a roroet scientist, while yom's focus is on his next batch ofalculus studen. >> this not rocket science.e. >> reporter: mireya villarqeal, nenenelos angeles. >> pellele andndhat's thcbs eveving newswsor tonight. for all of us at cbs news al arouou the world, good nig.

access.wgbh.orgi'm h llary clinton and i appre thth message.. r lifefe work hahabeenenenututeakingngarriers.s.and so would her presiy. which is why, r evevy americ who's not being paid whwh they'rereorth... who's held back by student debt or a system tilted againsthem- anthererare far too many ofyou- she understanan that our cotry cat te'spontia.. unlele we all dodo

a stronger c cntnt. / now from your breakingews leader this is k11 news a530 0 an 11 brking news alert. a a gunman o ons fire at a business in kansas - spree, we'll hello. im diannenderbrb hello. im d warar we begin tonight with h 11 breakinw newalert. police say at leastptwo peop wereikled and veral l hers have beenhot. this ialalunfofoing in hesuton, kansas, it's about 35353535miles north of wichitataas manal as three more may be intical l condaccording rererts from t tt area. e gunman opened%fire at a business called excel industriesesthey make turf care e products. ouousister station@nherereays the shooter is quote"down", but officials ararnot saying if the shooter is dead d not. hesston college is just ocks away from thth scene and it's currently on