. >> correspondent michael oku on l.a.'s teacher gaol and the lessons learnt from it. >>> later in this hour - hitting the high notes. some of broadway's best voices and why reaching the top is putting a dangerous strain on their most valued instruments. >> al jazeera america presents a breakthrough television event. borderland. six strangers. >> let's just send them back to mexico. >> experience illegal immigration up close and personal. >> it's overwhelming to see this many people that have perished. >> lost lives are relived. >> all of these people shouldn't be dead. >> will there differences bring them together or tear them apart? >> the only way to find out is to see it yourselves. >> which side of the fence are you on? borderland, sunday at 9 eastern, only on al jazeera america. >> al jazeera america >> this is the very tail section it was burning when we got here >> unbiased reporting... >> the violence has continued >> the violence has continued just a couple of miles from here >> in depth coverage... >> we've got a

. >> correspondent michael oku on l.a.'s teacher gaol and the lessons learnt from it. >>> later in this hour - hitting the high notes. some of broadway's best voices and why reaching the top is putting a dangerous strain on their most valued instruments. >> on tech know, >> scientists go up in the sky, >> we're flying over a fracking field in texas >> using ground breaking technology to check air quality down below. >> formaldehyde levels were astronomical...it's bad. >> tech know, every saturday go where science meets humanity. >> this is some of the best driving i've every done, even though i can't see. >> tech know. >> we're here in the vortex. only on al jazeera america. >> now available, the new al jazeea america mobile news app. get our exclusive in depth, reporting when you want it. a global perspective wherever you are. the major headlines in context. mashable says... you'll never miss the latest news >> they will continue looking for survivors... >> the potential for energy production is huge... >> no noise, no clu

. >> correspondent michael oku on l.a.'s teacher gaol and the lessons learnt from it. >>> later in this hour - hitting the high notes. some of broadway's best voices and why reaching the top is putting a dangerous strain on their most valued instruments. >> now available, the new al jazeea america mobile news app. get our exclusive in depth, reporting when you want it. a global perspective wherever you are. the major headlines in context. mashable says... you'll never miss the latest news >> they will continue looking for survivors... >> the potential for energy production is huge... >> no noise, no clutter, just real reporting. the new al jazeera america mobile app, available for your apple and android mobile device. download it now >>> in the ongoing fight to improve our schools there's no figure more central than the classroom teacher. in "america tonight"s special series "school's out", we look to california, where the teachers are at the heart of a battle over school reform. michael oku brings this report - do educator

"america tonight" can't michael oku. >> reporter: where you shop, what you buy, how old your children or are whether you drink too much. you would think it's private information. you would be wrong. the personal details are being collected, categorized and bought and sold every di by data brokers. >> the biggest business is gatheri gatheri gathering tremendous amounts of data. >> brian collect data for his blog. he said brokers hold the key to the king dom. >> they know what i buy, whether it's underwear, shoes, cars, houses. >> they know in some cases more about me than friends and relatives do. they know more about you than you do. >> reporter: at the world's largest information security conference in san francisco, the buzz was all about keeping your data safe from malware, spambots and other threats. pam dix job, the executive director of the forum says the real threat is not what hackers and thieves can steal, but what we hand over about ourselves voluntarily, unwittingly for free. >> the guys are good at keeping threats away. it doesn't mean companies can't buy and sell informat

michael oku finds alaska's wide-open spaces a welcome new threat. >>> also - a view of gaza under siege. a story developing at this hour. a plea for a pause falls on deaf ears. will an israeli casualty change what needs it be done. and the children that ran for their lives. >> what do you think would have happened to you if you stayed in el salvador? you don't think you would be living? >> lori jane gliha one on one with children who made a harrowing trip across the border alone. tonight they tell her why they did it, and whether the journey was worth it. >>> good evening. thanks for joining us. i'm julie chen. the heavy campaign and fire power enters a second week after hamas rejects a pause in the action deal. both sides launched new strikes. hospitals in gaza declared a state of emergency. 196 palestinians have been killed. 1400 injured. israel suffered its first fatality. a man near the border died after a shrapnel wound after a mortar attack in the south. the israeli defence minister was fired for criticising the top leadership for failing to take a harsher stand and not launching

michael oku finds alaska's wide-open spaces a welcome new threat. >>> also - aw

as michael oku reports, it's becoming a problem in alaska. >> hang on, i'm not supposed to go code 3 to the southside. we'll go a little faster. >> reporter: lately every night in the land of the midnight sun has been busy for this officer. he's been on patrol for half an hour when a report of a stabbing crack les through the radio. during his 9 hour shift. he will respond to as many as 15 incidents. anyone that visits, they'll ride along. it's a rude awakening. >> according to the fbi, there are more than 60 street gangs in alaska. >> in the past few months there has been a shooting or a stabbing. and a good majority are gang related. i remember growing up in miami, every school was infested with gangs. it's a huge eye opener. >> it's a disturbing trend that plays out along the alleys and roadways. >> why do you think your peers find the gang banging lifestyle attractive. >> the clothes they wear. drugs they have, the way they speak. >> why have gangs taken route. mountain view is not only pure, but a diverse area in america. they can be a way to belong. the o blood killings, the mo

michael oku finds alaska's wide-open spaces a welcome new threat. >>> al a

in this indepth report, michael oku visited a team of doctors determined to change that. >> every day in every hospital across the country, patients and families hope for small miracles. >> would i have to have surgery? >> that's something we left the door open for. >> reporter: here at the veterans administration hospital in california, timothy blumberg is being treated for esof goal cancer. while the yauts provides some of the world's advanced medical care, it's also the most expensive. last year alone, we spent 2.8 trillion on health care. about twice as much per person as canada, new zealand and france. the rate at which health care spending is growing in the country is sustainable. >> reporter: according to this professor, if nothing changes, we won't be able to afford the care we need. mill stephen run's the research center, or circumstance, which has a novel idea. cheeper care can be better. center? >> to design and demonstrate practical solutions to the growing unaffordability for states. >> along with his treatment, timothy blumberg is helping to cancer. >> is your primary go