>> school would normally be getting under way on a tuesday morning. now it's just lined with fire vehicles. >> reporter: distraught parents waiting outside, this student shaken by school shootings elsewhere, and now a stabbing at her own. >> i find it scary because now i don't think schools are safe anymore. >> reporter: the school facing questions on how to prevent this from happening again. >> we hate the idea of having metal detectors in the school, and yet kids' safety is the most important priority. >> reporter: we've learned one victim and a suspect released from the hospital, and police say they don't know what the motive for the attack is yet, but have a number of witnesses and will be working to sort through the statements as they investigate. kendis, diane? >> lauren, thanks. grief counselors at the school later on this morning to help those students. >> much needed. >> yeah. shifting to some lighter news now, a beautiful fir tree from wisconsin is on the way to the white house.

for pictures before the 19 foot tree was taken down arriving at the white house the day after thanksgiving and be put on display in the board room. >> it rolls up there, and michelle obama and the young ladies welcome a tree. coming up, it's what so many kids are hoping to find under their christmas trees, a shiny new cell phone. >> but before they power up, what parents need to know about monitoring their kids' cell phone use. you're watching "world news now." "world news now" continues

? ? oh, that messenger app. we really should download that one. >> what's instagram? >> never heard of it. i'm trying to download the seven minute workout app. >> oh, yeah? >> yeah. it's a science-based high intensity interval workout.

>> 12 exercises for 30 seconds, and you're done. >> i'm in for that. >> there are a growing number of apps these days for parents to monitor and even control the kids' cell phone use. >> it's a debate on whether and how much parents should supervise kids' cell phone activity. here is abc's t.j. holmes. >> reporter: preteens and teens, what are they doing on their phones? many adults will never know, but there's one who does. >> you can't hide from me. >> reporter: christine prestie, mom of 13-year-old and 11-year-old michael was so anxious to know what her kids do on their phones, she secretly installed spyware to watch them. she can see anything. >> it's legal to monitor your kids, but a controversy lurks. do teens deserve privacy or secretly monitoring for safety's sake more important? >> at 11 and 13, we should know what's going on in your life. >> what's the problem with letting your parents see your phones when they ask? >> i just want privacy. >> reporter: last summer, christine says isabella secretly became more secretive.

>> reporter: so christine downloads spy software on both kids' phones. were you torn? >> nope. >> you were not? >> not one bit. my kids, i needed to protect them. >> reporter: experts say secret monitoring may hurt your children and your relationship with them in the long run. julie haims is the author of "how to raise an adult." >> 24/7 surveillance of your kids, everywhere about every decision, every moment is effectively saying, i do not trust you in the slite them you trust them when you spy on them? >> wow. i hope they just know that i do trust them, and that i'm doing this just to protect them. >> reporter: using the app, she discovers isabella is texting someone she thinks is a teenager. but when christine calls the number, she gets a surprise. it's an adult. >> she thought she was talking to a friend, and it turned out that it wasn't. >> reporter: christine blocked the caller. still, it was a scary moment. >> went through every scenario,

>> reporter: christine knew she had to confront her daughter, which meant confessing about the spyware. but isabella came clean first. >> she came down the stairs, like, i need to talk to you. >> reporter: she beat you to it? she beat me to it. >> reporter: isabella told her mom about the stranger she was texting. and while shocked her mom was spying, she saw the other side. >> i had a lot of different emotions, like, why is she doing this, but i was happy because i knew she was protecting me. >> yeah, see, you can spy on the kids, and eventually they come around. >> absolutely. >> even if they hate you in the moment. they'll get over it. they'll hate you later in life when you're in the home. so i'm reading the instructions for the seven-minute workout. >> you're into this seven-minute workout thing. >> it's really, like, deep here. jumping jacks, description. start with your feet together and arms at your sides. slightly bend your knees and jump straight up as you are jumping jacks, kick your legs out to shoulder width and bring

width and bring your hands overhead to

my cold medicines' wearing off. that stuff only lasts a few hours. or, take mucinex. one pill fights congestion for 12 hours. guess i won't be seeing you for a while. why take medicines that only last 4 hours, when just one mucinex lasts 12 hours? let's end this. happy anniversary dinner, darlin' can this much love be cleaned by a little bit of dawn ultra? oh yeah one bottle has the grease cleaning power of two bottles of this bargain brand. it's judgment day. back seat chefs peer inside your oven. but you've cleaned all baked-on business from meals past with easy-off, so the only thing they see is that beautiful bird. go ahead.

might need this for the next segment. >> we've been warned. it's never easy to say good-bye to a four-legged family member, but one man across the pond had plenty of help. >> a surprise outpouring of kindness tops this morning's two >> grab a tissue for the first truth. he asked people to join him at the beach for the last walk with his 18-year-old dog. he underestimated strangers. hundreds of dog lovers and their furry friends joined mark and walnut pouring on to the beach in cornwall, uk, this weekend to honor walnut's last walk hours before the elderly dog had to be put down. they tweeted messages of support, #walkwithwalnut, and he thanks everyone for coming out,

be alive to share in the wonderful world that our pets give us. fitting tribute there for walnut. next up, remember those word problems in your college math classes? well, for one college professor, those exercises of probability just became a lot more autobigraphical. nicholas kapour is a statistics professor at fairfield university in connecticut, with who just so happened to win the lottery, taking home a $100,000 jackpot. kapour said he iger in order the advice of his teacher who said the odds were too small to win the lotto. and he's an example and probably lectures saying someone has to win, so why not you? finally, why is this suddenly the most popular bird in all of china? because his combover resembles the new president-elect here in the u.s.

folks are flocking to the enclosure in china to look at the donald trump look-alike. the bird's name is little red and the species is indigenous to central china. what came first the chicken or the egg, but one user wants to know, so does the bird look like trump or does trump look like a chinese pheasant? what do you think? >> oh, we're still trying to get over walnut. >> kendis, you okay? >> i don't know. poor walnut. >> you're going through it now. >> it's sad. >> it's okay. walnut had a good life. >> yeah. the neighbors came out.

happening right now...the winds are picking up and we're in store for a big temperature change in the valley... let's get right over to 13 first alert meteorologist greg bennett who's watching when the wind will hit.. cold front is just to the northwest of southern nevada already! breezy conditions this morning turn into a wind advisory for all of southern nevada starting at 10am and will last to at least 1am thursday morning. the mountains and red rock areas will have the strongest winds gusting between 40 and 60 mph through today and tonight with the valley gusting up to 40 mph. sustained winds look to hold between 15 and 25 mph this afternoon; allowing for dust, sand, pollen, and small debris