process. not everyone is on board. >> thank you for watching tonight at 5:00, we will be back in 30 minutes with more news. captioning sponsored by cbs >> enough is enough! enough is enough! >> glor: students across the nation walk out to protest gun violence, as the parkland shooting suspect appears in court facing the death penalty. also tonight, three california thre schoolers are injured when a teacher accidentally fires a weapon. >> my immediate reaction was, yes, honored to take the job. >> glor: another major change at the white house, with more likely on the way. six american soldiers caught in an avalanche. a sound mind in a sound body-- a isw study suggests exercise could help stave off dementia. canine chaos-- united flies the wrong pets to the wrong places. and, remembering the brilliance and inspiring life of stephen hawking. >> so remember to look up at the stars and not down at your feet.

this is the "cbs evening news" with jeff glor. >> glor: this is our western edition, good evening. we'll begin tonight with walkouts across the country as a suspect appears in court in florida. hundreds of thousands of high school students left schools for at least 17 minutes, one minute for each of the people killed in parkland one month ago today. at the u.s. capitol, students were joined by some house and senate leaders. the national walkout was inspired by students of marjory stoneman douglas high school, and adriana diaz was there tonight. >> reporter: a sea of students streamed out of the school behind a national movement. parents at marjory stoneman douglas high school cheered them on, like rick and rosemary jensen. >> this wasn't the way i wanted my son to become an activist, but, you know what, i'm so glad the kids have found their voices. uoyinghope it is what is buoying them, because this isn't easy for them.

>> reporter: freshman alexa palen and brianna jesionowski hugged by a memorial for their friend, 14-year-old gina montalto. does a walkout, like what you guys are doing, do you think it helps? >> it does help, because it shows that the community is so hrong and that we are coming through this together. >> reporter: but the father of 14-year-old victim alaina petty wants a different approach. on twitter, ryan petty encouraged students to walk up to the kid who causes nts urbances in class and ask how he's doing, adding the hashtag "walk up, not out." still, in portland, oregon, orudents in florida left a clear message, and snow in akron, ohio, didn't stop the students from showing their support. >> this is what democracy looks like! >> reporter: in nearby chicago, nearly 1,000 students left jones college prep, but they say the rest of america is now grappling with the gun violence they've battled for years.

y they don't live in cities or communities where guns play constantly, where children are dying 24/7 in the streets, no matter if they're coming to or from school. >> reporter: in washington, d.c.: >> if you can speak, speak! if you can march, march! >> reporter: young people wanted their voices heard. kate whitman organized her school walkout in new york city. >> we saw this in the '60s and the '70s with m.l.k., with the vietnam protest, and we're seeing this here right now. this is a part of history! >> reporter: while the walkout was underway, the n.r.a. tweeted, "let's work together and secure our schools and stop school violence. , protect our banks, our sports stadiums and our government buildings better than we protect our schools." the n.r.a. wants congress to push through legislation that increases school safety. jeff? >> glor: adriana diaz in parkland, thank you very much.

ere gunman in the school shooting stayed silent today. his lawyers repeated their offer: nikolas cruz will plead huilty if his life is spared. prosecutors rejected it. they're going for the death penalty. newly released 911 calls from inside the high school reveal a frantic effort to save the wounded before help arrived. >> glor: coral springs police say they fielded 115 calls in two hours after the shooting. at a high school in seaside, california, a lesson in gun safety yesterday did not go as planned. it ended with three students wounded. ireya villarreal says this was not an isolated incident. >> reporter: as a california enacher attempted to instruct students about gun safety in his criminal justice class, the gun accidentally went off.

dennis alexander, a reserve officer, city councilman, and teacher, is now on administrative leave. >> my gosh, good that it went up to the ceiling. what if someone somehow got it? >> reporter: three students were hit by falling debris when the bullet hit the ceiling. bu fragments from the bullet struck a student in the neck. ay, eporter: also on tuesday, a school resource officer in iaexandria, virginia, accidentally discharged his weapon in his office. no one was hurt. two weeks ago, a teacher in g lton, georgia was arrested after barricading himself inside a classroom and firing at the school's principal. incidents like these come amid calls to arm teachers in schools nationwide. education secretary betsy devos addressed it on "60 minutes." >> do you think that teachers should have guns in the classroom? >> that should be an option for states and communities to consider. st >> reporter: the president sideinues to suggest that teachers should be allowed to carry concealed weapons on campus.

le far, in at least 11 states, school staff members are allowed to carry weapons in school or have access to them. jeff? >> glor: mireya, thank you. there is breaking news in the florida keys tonight. a navy fighter jet crashed this evening near key west. we navy says it was an f-18 hornet, like the one you see here on the screen. the two-person crew based in norfolk, virginia, ejected ctfore the crash. they were recovered. their condition, though, is not known, nor is the cause of that wreck. in vermont today, there was an avalanche as u.s. soldiers were conducting advanced mountain training. six of them were hurt. rescuers raced up the mountain to free them. osve were taken to the hospital. none of the injuries are considered life-threatening. anis was the second avalanche to hit that area in several days after heavy snowfall. at the white house tonight, the shake-up continues. a new economic adviser is about more tin, and more top members of the administration may soon be leaving.

jericka duncan has the latest. >> and i have a great job. >> so you're not leaving? >> i am not leaving. >> you're not leaving. ( applause ) louieporter: the president was touting economic growth and job security in st. louis today, but back at the white house, jobs seemed anything but secure. cnbc television contributor larry kudlow was named director of the national economic council, replacing gary cohn, who announced his departure last week. >> the greatest and most important thing for this or any other country is rapid economic growth and prosperity for everyone. >> reporter: so far, more than 20 senior administration staffers have either been fired, resigned, or reassigned. >> good afternoon, all. >> reporter: just yesterday, the thesident pushed out secretary of state rex tillerson, and there's talk of more changes. secretary of veterans affairs and obama-era holdover david an shulkin could be next to get the ot.t. in february, the inspector

general determined shulkin used fterayer dollars on a lavish trip to europe for his wife. he paid the money back after it became public. and national security adviser h.r. mcmaster's departure has been expected for weeks. sources say mcmaster and ve cident trump have clashed over policy, something the president said he relishes. >> i like conflict. i like having two people with different points of view, and i certainly have that. and then i make a decision. >> reporter: but trump's likely cmck to take mcmaster's place is former u.s. ambassador to the wn., john bolton, whose foreign policy ideas are more closely aligned with the president's. secretary of housing and urban development ben carson has also come under fire for spending $31,000 on a dining room set for his office. that order, jeff, was eventually canceled. >> glor: jericka, thank you. cbs news has confirmed that e drew mccabe, once the deputy director of the f.b.i., could be fired this week, just days short of his official retirement from the bureau.

jeff pegues is following this story. jeff? >> reporter: jeff, as you know, andrew mccabe has been caught up ep a high-level investigation by mccdepartment of justice inspector general. that probe is about how the f.b.i. conducted its investigation of hillary clinton's private email server. the final report is due soon, but according to sources familiar with its conclusion, it says mccabe misled investigators about whether he had talked to a stporter about an f.b.i. investigation into the clinton on,ndation. the f.b.i. has recommended mccabe be fired, and now it's up to the attorney general, jeff session, to decide. if mccabe is fired, he could lose his pension. cacabe has been a frequent target of president trump over the last year. in december, the president tweeted, "f.b.i. deputy director andrew mccabe is racing the clock to retire with full benefits. 90 days to go." mccabe, by the way, also led the initial stages of the russia investigation. within the f.b.i., lying during an investigation is considered a cardinal sin.

we did reach out to mccabe, but we have not yet heard back. jeff? >> glor: all right, jeff. thank you. britain expelled 23 russian diplomats today after the poisoning of a former russian spy. sergei skripal was attacked with a nerve agent developed by the soviet union. he and his daughter are in critical condition. the white house expressed solidarity with britain. at the u.n. security council, dos. ambassador nikki haley pointed the finger at russia. >> if we don't take immediate, concrete measures to address this now, salisbury will not be the last place we see chemical weapons used. they could be used here in new york or in cities of any country that sits on this council. >> glor: russian president vladimir putin said nothing about this today. he was busy campaigning for reelection in crimea, the province he took illegally from ukraine. elizabeth palmer is there. >> reporter: this is putin's

warm-up. and this is his base. pumping up potential russian voters is the name of the game now. there is no question that ngesident putin is going to win the election on sunday. it's no contest. and for that reason, a lot of russian voters are apathetic. so the kremlin is working hard to make sure they're not embarrassed by low turnout. putin's message today was proudly nationalistic. "crimea," he said, "has returned home to russia." he is talking about 2014, when russian troops wearing uniforms with no insignia, the so-called little green men, seized crimea from ukraine. at the time, putin denied he sent in the military. and then, when it was all over, he bragged about it. the u.s. and most countries called the seizure "illegal," d d slapped on sanctions. but today on his whirlwind tour,

putin visited the bridge russia is building to physically link its mainland to crimea, a pogaproject that's wildly popular with russians who support the land grab. but it's also a message to the west-- putin never backs down. that's something else russian t ters love about him. as he said before he left the stage, "i would like to hug you all." president putin made no mention of the growing rift with britain over the poisoning of the russian exile, sergei skripal. act the very fact that he held his rally here in disputed territory makes a bold statement about russia's attitude to international law. jeff? >> glor: indeed it does. liz palmer in crimea. thank you. a new study out today finds icaln who are physically fit may be 90% less likely to develop dementia. orth more on the link between a healthy body and a healthy mind, cbs news medical contributor dr. tara narula is here now. tara?

>> reporter: hi, jeff, how are reu? >> jeff: good. >> reporter: so this is an interesting study. researchers looked at about 190 swedish women who are middle aged. they gave them a fitness test and tried to tell whether they had low, medium, or high levels of fitness. they then followed them for neout 40 years to see who developed dementia. and they found that those in the highest fitness level group on average developed dementia at a erte of about 5% compared to f abouin the lowest, who developed it at the rate of aout 32%. in addition, higher levels of fitness seemed to delay the onset of dementia. so instead of getting dementia at the age of 79 in the medium fitness group, you would develop it at the age of 90, 11 years later, if you were at the highest level of fitness. >> glor: do we know why people working out develop this protection? >> reporter: it's interesting, we don't know for sure. some may be the indirect effects of controlling cardiovascular risk factors, blood pressure,

cholesterol, diabetes, obesity, improving blood flow to the brain. however, there may be also a component directly affecting the brain, where you're improving the architecture, the wiring, the connectivity, and communication going on in the mmain itself. >> glor: so any of this physical fitness that you can squeeze in is obviously a very good thing. >> reporter: yes, and the earlier you start the better. you don't have to do crazy levels of fitness. 150 minutes a week of moderate- level aerobic activity. >> glor: good to hear. tara, thank you very much. coming up next on the "cbs evening news," when dogs fly. onited airlines delivers the wrong dogs to the wrong cities. and, the mediocre student who captured the imagination of the world. each day justin chooses to walk. at work... and after work. he does it all with dr. scholl's.

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>> reporter: ten-year-old german shepherd irgo was supposed to fly from oregon to kansas city. but when owner, carol swindle, arrived in kansas city, he was given a great dane instead. the dogs got switched, and irgo went to japan. >> at this point, all i can do is be hopeful that my dog is going to be okay and return safely. >> reporter: united says the error happened during the dog's connection in denver. today, the airline is apologizing, something it's done a lot this week. >> he was barking during the flight. that stopped, like, after two hours. >> reporter: monday night, on a flight from houston to new york, a flight attendant ordered them to put this bag in the overhead bin. inside was their ten-month-old french bulldog, kokito. >> she was literally not moving or anything. >> reporter: kokito died. united admits the flight attendant did not hear or understand and did not knowingly place the dog in the overhead bin.

more than 500,000 animals flew in 2017, nearly 140,000 on united. overall, 24 died; 18 of those on united. >> what happened with this is disgraceful. >> reporter: republican senator john kennedy, himself a dog owner, plans to push legislation banning animals from the hierhead bin. >> we need to get to the bottom ba it. and i know we have many important things to do, but this is important too. >> glor: kris, what is united saying about this tonight? >> reporter: well, united said tarting in april, they are going to issue brightly colored tags for carry-on bags that contain live animals. that's to further flag flight crews that there is a live animal inside. senator kennedy plans to submit his bill tomorrow. and as for irgo, his japanese adventure is going to last a little bit longer. the airline expects he'll be home tomorrow. he'll be flying inside the

passenger cabin this time with a human escort, and may be coming home first class. jeff? >> glor: all right, good luck to irgo on the way back. kris, thank you. when we come back here, toy story, the final chapter. 3, 2, 1... not cool. freezing away fat cells with coolsculpting? now that's cool! coolsculpting safely freezes and removes fat cells with little or no downtime. and no surgery. results and patient experience may vary. some rare side effects include temporary numbness, discomfort and swelling. ask your doctor if coolsculpting is right for you and visit coolsculpting.com today... for your chance to win a free treatment. and back pain made it hard to sleep and get up on time. then i found aleve pm. the only one to combine a safe sleep aid...

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r> glor: a one-time rising star in silicon valley gave up control of her company today and will pay $500,000 to settle a ayvil fraud case with the s.e.c. ith theth holmes claimed her blood-testing company theranos had developed revolutionary technology that could detect a d reer of diseases, but the f.c.c. found it used traditional equipment. theranos, once valued at $9 billion, closed its lab in 2016. more than a million fords and lincolns are being recalled because the steering wheel could become loose and fall off. the recall affects the ford fusion and lincoln mkz, model years 2014 through 2018. ford says the problem may have caused two accidents and one injury.

toys "r" us reportedly told u.s.oyees today they are going out of business. all 700 u.s. stores, including onthes "r" us, will be sold or mosed in the coming months. as many as 33,000 jobs will be lost. up next here, what a genius taught the world. because we've seen a thing or two. ea. [cougar growling] [passenger] what are you doing? [driver] i can't believe that worked. i dropped the keys. [burke] and we covered it. talk to farmers, we know a thing or two because we've seen a thing or two. ♪ we are farmers. bum-pa-dum, bum-bum-bum-bum ♪

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>> glor: we end here tonight with one of the wonders of the universe. his name was stephen hawking. hawking died today at his home herey in cambridge, england. he was 76. pre's mark phillips. >> understanding how paradoxes between quantum mechanics... y haeporter: the body had been ravaged by disease, but the mind ared i into the cosmos. >> hello! >> reporter: stephen hawking had

even trained, hoping to go into space. >> i could have gone on and on. space, here i come. r reporter: his life would have been an inspiration, even if he medn't defied medical science and lived 50 years longer than a e, ion afflicted with a.l.s., the muscle-wasting lou gehrig's en if e, is supposed to. and even if he hadn't, as he ince told "60 minutes," gone scientifically where no man had gone before... >> for me, it is quite an achievement. i never thought i would get so far. >> reporter: his physical limitations had, he said, freed his mind to develop brilliant new theories on the origins of the universe, or on what actually happens in space's black holes. and his ability to explain those theories, using his computer in hhesized voice. and in his unlikely bestseller, "a brief history of time," made him probably the most famous scientist of his generation. of earned him one of president

obama's first medals of freedom. >> professor stephen hawkins was a brilliant man and a mediocre student. >> reporter: hawkins' life story, depicted in the 2014 epvie "the theory of icteything," might have been dismissed as a hollywood fantasy if it wasn't true. >> i reversed the process all ocess y back to see what happened at the beginning of time itself. tseleporter: but he didn't need dntors to play him-- he was hite willing to play himself, on "star trek." >> i fold. >> wrong again, albert. >> reporter: and on "the simpsons." >> i wanted to see your utopia, but now i see it is more of a fruitopia. >> reporter: but it's the science that endures. that and his message. >> so remember to look up at the stars and not down at your feet. >> reporter: mark phillips, cbs news, london. >> glor: that is the "cbs evening news" tonight. i'm jeff glor. the news continues now on cbsn. good night. captioning sponsored by cbs

cell phone companies are using churches to build their new cell towers.. and bypassing the normal review process. good evening, kpix5 news begins with a surprising way that cell phone companies are using churches to build cell phone towers and bypass the normal review process. good evening.>> they are unlikely business partners, verizon wants to make a deal with a santa rosa church. several companies -- cell phone companies are seeking a higher calling. >> reporter: the cell phone tower would be in the steeple right here along the side of this church. 60 feet in the air. this would be built right across the street from all of these houses. this church in the middle of the santa rosa neighborhood, it's ground zero in a crusade against verizon. >> my first thought why is brick other here -- my first

thought was, why is big brother here and do i want them in my backyard? >> they've gone 50+ years without a steeple. >> reporter: the church would get a 62 foot high steeple complete with across -- with a cross and cell phone antennas. this is a similar steeple that verizon built and paid for earlier this year at a church across town. >> a 60 foot tower looming over my home, seen from all angles. my front yard, side yard, backyard, even the yard furthest from them. i just don't want to have a commercial enterprise looking over my home. >> reporter: because these antennas would be building mounted, the permits are classified as minor rather than major. it has a different public notification process