Our Senior National correspondent Anthony Mason is following all of this. Anthony . Reporter scott, it was a painful day to check your 401 k . The dow is down more than 900 points since monday, thats more than five percent. The catalyst for the selloff once again was china. The Chinese Market shut down after less than half an hour this morning after plunging 7 . It was the second shutdown this week. Investors are worried the chinese economy is slowing. Gdp growth, which hit 12 five years ago, is now below 7 . If chinas in trouble, that could mean trouble for the rest of the world. And with this chaos in the shanghai markets, there are worries the chinese dont have handle on their own economy right now, scott. Pelley and anthony, the chinese are also the second Largest Consumer of crude oil in the world. And youve been looking into the impact of that. Reporter yeah. Crude, scott, hit a 12year low today. 33 a barrel. The price has fallen by nearly half just since may, when it was if you drive to work, its like a huge tax break, but its pretty painful if you work in the oil industry in houston. Theres just too much supply now. And if china continues to slow, there will be less demand and gas prices could stay low for a while, scott. Pelley Anthony Mason, thank you very much, anthony. The folks at dow jones told us today that the plunge this week in the 30 blue chip stocks alone represents a market value loss of nearly 260 billion. Well ted cruz is watching his stock rise, in iowa. Major garrett took a ride with the republican frontrunner 25 days before iowans cast the first votes of campaign 2016. Reporter we rode with ted cruz on day four of a sixday bus tour of iowa and asked about his birth in canada, and Donald Trumps legal advice. This issue is a nonissue. The law is quite clear that the child of a u. S. Citizen born citizen. Reporter you perceive this donald trump says hes trying to help you. The funny thing about politics, its fairly unusual for your opponents, who are running for the same position, to be actually trying to help you. I will hear their prayer and forgive their sins, and i will heal their land. Reporter cruz has climbed to the top of the iowa polls by reaching out to evangelicals and social conservatives. In 2012, 57 of republican caucusgoers describe themselves as evangelicals. 47 said they were very conservative. But cruz says his strategy does not rely just on iowa or new hampshire, whose more moderate electorate has not been as welcoming. There are a lot of candidates in this race who have to win iowa. There are a lot of other candidates who have to win new hampshire. From our perspective, we dont view any one state as a must win. Were going to compete hard and try to win everywhere. Reporter cruz has taken a harder line on immigration than willingness to allow deported immigrants to return to the u. S. Does the fact you enter illegally permanently bar you from ever entering the country legally . I dont believe that anyone who has come here illegally should be eligible for citizenship. Reporter cruz faced the reality of that policy yesterday in storm lake when he met a woman protected from deportation by Obama Administration executive actions. Cruz told the woman, under a cruz presidency, she would have to leave and he told her, scott, breaking the law creates human tragedies. Pelley Major Garrett in iowa for us tonight. Major, thank you. Late today in oregon, the sheriff met with the leader of a group of protesters who had been occupying buildings at a National Wildlife refuge, the is sheriff offered them safe escort out of town and is waiting to hear back. The protest is in support of ranchers who were sent to prison for setting a fire that spread today there was a scare in paris on the anniversary of the terrorist attack on Charlie Hebdo magazine. Mark phillips is there. Reporter this time the only body lying on the streets of o paris belonged to the attacker. He had approached a Police Station carrying a butchers knife and shouting the islamist militant war cry allahu akbar, god is great. Police said there were wires coming out of his jacket, as if from a suicide vest, shot him dead. An examination of the body found no bomb, but police say they did find a handwritten note claiming allegiance to isis. Jawad rabi runs a Clothing Store nearby. I was really concerned because there was a school, you know, just near the Police Station. Reporter the attacker was later identified as a local petty thief known to police but with no known connection to any terrorist group. He apparently acted alone. The incident. It took place as president Francois Hollande led a ceremony commemorating the victims of the Charlie Hebdo massacre a year ago. And the memories of the second wave of attacks less than two months ago are still vivid. President hollande said france was now living under a constant threat and Charlie Hebdos typically defiant anniversary cover suggested why. A godlike image carries an Assault Rifle murder in the name of religion. The killer, it said, is still on the run. As terror attacks go, scott, this one, an apparent loner with a knife and fake bomb, is less deadly than the others which have taken place here, but it still sends a message the enemy is among us. Be afraid. Pelley Mark Phillips in paris tonight. Mark, thank you. Today, we saw new evidence that the barbarity of syrias civil five years. A town is being starved by the dictators forces. Men, women and children are dying in slow motion as one resident put it. Heres elizabeth palmer. Reporter months of deprivation have pushed the smallest and the poorest to the very brink. A mother feeds her child with what looks like broth, but its actually water, favored with jam. In an online appeal, a man explains, we have no food, no water and no power, and then he bursts into tears. Please, world, he says, we are dying. Activists say the most wretched are making soup with grass, and some have died of starvation. And all this just 30 miles from the capital, damascus, in fertile hill country. It was still safe enough to visit the rebels who control the area. Now they and more than 40,000 residents are trapped, surrounded by Syrian Government forces who have sealed off all the roads. This video, posted by activists, shows the residents begging the government soldiers to let Food Supplies in. But the last aid convoy they allowed to pass was back in october. But suddenly today, scott, after those pictures of the starving people had caused international consternation, the Assad Government announced that it was going to allow one humanitarian aid convoy into madaya probably some time over the weekend. Pelley liz palmer reporting from the london newsroom tonight. Liz, thank you. A runaway natural gas well in los angeles has been flooding a neighborhood with methane for 76 days. 2,000 people have been evacuated as Southern California gas flow. Mireya villarreal is following this. Reporter this infrared video shows you what you cant see with the naked eye, a geyser spewing at least 70,000 pounds of gas every hour into Southern California neighborhoods less than two miles away. We call this the b. P. Oil spill on land. Reporter environmental activist Erin Brockovich was blunt about the latest gas leak findings. A new study commissioned by a law firm suing the utility says gas is now reaching porter ranch neighborhoods 18 hours of the day. This isnt a onetime assault. This is an ongoing assault every single day. Reporter the source of the leak is a hole in a 62yearold pipe. Southern california gas chief operating officer brett lane. I personally apologize to the residents. This is something that, you know, the nuisance that they face, the different issues that they have faced, we do apologize again, our focus right now is to try to eliminate that nuisance or the issues that they face by stopping the leak as fast as we can. Reporter to stop the leak, the Utility Company needs to drill down 8,000 feet. Theyre using a relief well to intersect the leaking pipe and plug it up. The gas Company Estimates the process will take until april. Christine soderlunds home is less than two miles from the gas leak. She moved after her children started to get sick with unexplained headaches, nausea and nosebleeds. I am worrying about the gas every day. Im worrying about my familys health. Reporter there are 115 wells in the hills that you see behind me, including the one that is leaking, and, scott, of those 115, only ten have safety valve shut offs. Pelley Mireya Villarreal reporting for us tonight. Mireya, thank you. Last night, we showed you remarkable pictures of people lining up down the block to doctors office. An office the Authorities Say is really just a front for drug dealing. Well, tonight jim axelrod and producer ashley velie continue their investigation in West Virginia, where the state is suing, accusing pharmacists and drug dealers of making millions, pushing narcotics to anyone who wants them. Reporter no state has had more trouble with prescription pain pills than West Virginia, and no town in West Virginia more trouble than kermit, population 400. This undercover video of kermits main pharmacy shows scores of people picking up prescriptions inside and at the drivethru window. They fill more scripts for oxycodone than all but 21 pharmacies in america. Reporter in the country . In the country. Reporter jim cagle represents the state in the groundbreaking lawsuit against distributors. What you have is some bad doctors and pharmacies who are willing to turn a blind eye because of the money thats involved. Reporter more than three million doses of hydrocodone were ordered by a kermit pharmacist, james willie, in one year. He paid drug distributors hundreds of thousands of dollars, while netting more than 6 million in profit. In 2012, willie lost his license and served six months in prison for illegally dispensing drugs. But cagle told us the problem persists. This pharmacy, tug valley, is now being sued for negligently filling prescriptions. Records show tug valley was filling more than 150 pain prescriptions a day from one clinic alone. Hi, you mr. Bellengee . Im jim axelrod with cbs news. We decided to ask owner randy bellengee about the charges. Alleging substandard care. You have nothing to say to me directly . At his lawyers direction, he wouldnt respond. We would think an alarm bell would go off. Reporter West Virginia secretary of health Karen Bowling says until now, the drug distributors have escaped scrutiny. If youre a distributor, if youre providing medication to pharmacies, someone would say, wow, this is a lot. What do we need to do about it . Reporter thats the premise behind the unprecedented lawsuit. Under West Virginias law, distributors are legally bound to report suspicious orders from pharmacies. Reporter if that distributor has good reason to believe that the prescriptions that are being filled are not for legitimate medical purposes, then they are not to make that delivery. They have an obligation . They have a duty, yes. Reporter Amerisource Bergen is the Third Largest drug company in the country and one states case. Over a fiveyear period, they filled orders for 118 million hydrocodone and oxycodone pills, enough to supply every West Virginian with 13 pain pills a year. Thats scary math. It is. Yes, it is. It is actually the product of what i would refer to as a Business Plan, a Business Plan by people that are not honorable people. Reporter we reached out to lawyers for Amerisource Bergen. They told us they couldnt comment because of this ongoing litigation. This potentially precedent setting trial is set to begin in october. Pelley remarkable reporting, jim. Thanks. The military has identified the green beret who was killed tuesday in afghanistan. Hes Staff SergeantMatthew Mcclintock of new mexico. Hes 30 years old. He leaves a wife and their threeyearold son, declan. Firefight with the taliban on his third combat tour. Theres more news ahead. Di new dietary guidelines from the government wont sit well with anyone who has a sweet tooth. And well take a fine italian cbs evening news continues. You owned your car for four years, you named it brad. You loved brad. And then you totaled him. You two had been through everything together. Two boyfriends, three jobs. Youre like nothing can replace brad. Then Liberty Mutual calls, and you break into your happy dance. If you sign up for better car replacement , well pay for a car thats a model year newer with 15,000 fewer miles than your old one. See Car Insurance in a whole new light. Pelley today the government revised its advice for a healthy diet. The headlines lean meat and eggs may now be okay, but sugar and salt still bad. Heres dr. Jon lapook. Reporter the new u. S. D. A. Guidelines recommend people consume less than 10 of calories per day from added sugars, about 12 teaspoons. Less than 10 of calories per day from saturated fats, about a fastfood cheeseburger, and less than 2,300 milligrams per day of sodium, about a teaspoon of table salt. Women should consume between 1,600 and 2,400 calories a day. Lets see how this samples of daily meals stacks up. If you have cereal and coffee for breakfast, a cheese wrap for lunch, an apple for a snack, salmon, vegetables and a glass of wine for dinner, add smallt piece of cake for dessert, you consumed about 2,150 calories. But the soda alone exceeded the recommended sugar limit, and the turkey wrap and chips contain about 1,100 milligrams of sodium, already half of the recommended amount. Sharon zarabi is a registered dietitian at lenox hill. Is honey added sugar . Honey is added sugar, although it is natural, but youll notice that milk products, such as milk or even a yogurt, has 12 grams of sugar per cup, and then when you are making it a fruitflavored yogurt, that doubles the sugar from 12 to 24 grams per serving. Reporter we also asked about foods with unexpectedly high sodium. The same type of flavor one bottle can be 450 milligrams of sodium versus 300 milligrams. Reporter thats a huge difference. Yeah. Reporter scott, its so easy to get faked out. You might think this spinach wrap is better than this piece of white bread, but the bread has 90 calories and no saturated fat, and the wrap, 210 calories and two grams of saturated fat, so you have to read the label. Pelley read the labels. Dr. Jon lapook. Doc, thanks very much. Coming up, were going to of laughs one day at a time. Laughs one day at a time. politely wait, wait, wait you cant put it in like that. You have to rinse it first. Thats bakedon alfredo. Bakedon . Its never gonna work. Dish issues . Trust your dishwasher with cascade platinum. It powers. Through. Your toughest stuckon food. Better than finish. What if one piece of kale could protect you from diabetes . What if one situp could prevent Heart Disease . One. E. Wishful thinking, right . But there is one step you can take to help prevent another serious disease. Pneumococcal pneumonia. If you are 50 or older, one dose of the prevnar 13 vaccine can help protect you from pneumococcal pneumonia, an illness that can cause coughing, chest pain, difficulty breathing, and may even put you in the hospital. Even if you have already been vaccinated with another pneumonia vaccine, prevnar 13 may help provide additional protection. Prevnar 13 is used in adults 50 and older to help prevent infections from 13 strains of the bacteria that cause pneumococcal pneumonia. You should not receive prevnar 13 if you have had a severe allergic reaction to the vaccine or its ingredients. If you have a weakened immune system, you may have a lower response to the vaccine. Common side effects were pain, redness or swelling at the injection site, limited arm movement, fatigue, headache, muscle or joint pain, less appetite, chills, or rash. Get this one done. Ask your doctor or pharmacist if a denture were to be put under a microscope, we can see all the bacteria that still exists. Polidents unique micro clean formula works in just 3 minutes, killing 99. 99 of odor causing bacteria. For a cleaner, fresher, brighter denture every day. Dave, im sorry to interrupt. I gotta take a sick day tomorrow. Dads dont take sick days, dads take nyquil severe the nighttime, sniffling, sneezing, coughing, aching, fever, best sleep with a cold, medicine. Pelley tonight arizona is getting the el nio rains that flooded Southern California this week. In san diego, a driver turned a 200,000 lamborghini, the white one there, into a speedboat. But believe it or not, the engine did not stall. And near san francisco, a man watching waves roll in got actor Pat Harrington has died. He was schneider, the super on one day at a time. I got a little present here for you. Its something that all the ladies in the apartment are fighting over. Its a whispersilent flush valve for your can. Pelley Pat Harrington died of alzheimers disease. He was 86. In a moment, defying the odds. A 700 million return on a 2 on a 2 investment. Nice work, phillips the tasty side of fiber, from phillips. If youre looking to save money on your Medicare Part d prescriptions, walgreens says, carpe med diem. Seize the day to get more out of life and Medicare Part d. Just switch to walgreens for savings thatll be the highlight of your day. Now preview the cost of your copay before you fill. Hey dad. Hey sweetie, how was your first week . Long. Itll get better. Im at the edward jones office, like sue suggested. Thanks for doing this, dad. So i thought it might be time to talk about a financial strategy. laughing you mean pay him back . Knowing your future is about more than just you. So lets Start Talking about your longterm goals. Multiplied by 13,000 financial advisors. Its a big deal. And its how edward jones makes sense of investing. News now examines what chinas troubles really mean for southern nevadas bottom line next at 6. Pelley americans pursuing a dream have driven the jackpot for saturday nights powerball to more than 700 million. Heres mark strassmann. Those are the winning numbers right there. Reporter not much got done at the office today. Reporter everyone was out working on a retirement plan. There was definitely a buzz about it. Reporter jeff rosen organized his office pool in atlanta. Lets look at those numbers one more time. Reporter last nights 500 million drawing was the 18th time the jackpot has rolled over since the last winner in november. Have you watched it climb 300, 400, 500. You drive down the interstate and see those big billboards and youre like, wow. You sit in traffic in the morning and think, man, if i won that. Reporter this 700 million jackpot for a single winner could actually mean a onetime cash option of 428 million. To win, you just got to defy odds of 292 million to one. Just one . Reporter you have a better chance of being hit by lightning while drowning. Why do i play . Because i want money. I only play when its 700 million. 50 million . Reporter this jackpot is already a record by 110 million, and players in 44 states will drive it higher by saturday nights drawing. I feel lucky today. Reporter which is why so few people felt like working today, and tomorrows not looking much better. Were trying to win the big one. Thats it. Reporter mark strassmann, cbs news, atlanta. Pelley and thats the cbs evening news for tonight. For all of us at cbs news all captioning sponsored by cbstrying to orchestrate a murder. From behind bars. The new trouble one inmate finds himself in. Half a year after allegedly shooting someone at a local subway shop. Dave Courvoisier filling the void. Were going all out by making sure there are plenty of teachers in the classroom all the kids deserve a licensed teacher in front of them the progress made so far this and why it will likely be back