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As two countries grieve the ambush killings of six children and their mothers, Mexico's president has set up a special commission to find the killer or killers.More than 200 shell casings were found at the scene of Monday's attack near the Sonora-Chihuahua border, commission member Marcello Ebrard said Wednesday.Secretary of Security Alfonso Durazo said gun caps at the scene came from a weapon made in the US.But the discoveries haven't gotten officials any closer to arresting whoever killed three mothers and six of their children in the grisly attack.The three mothers drove together in a convoy for added protection, family members said."All of a sudden, bullets just rained from above, from on top of a hill, down on top of them," said 756

Bird populations in the United States and Canada have dropped by 29% since 1970, signifying 2.9 billion birds lost in almost 50 years, according to a new study.The scientists involved in the study warn that like a canary in a coalmine, birds reveal environmental health. This steep loss of bird populations, including some of the most common birds like sparrows and finches, shows that human impacts on the continent's environment mean it can no longer support the wildlife systems it once did.Normally, it's hard to track animal populations this way. But birds are much easier to monitor. The study combines almost 50 years of data, including information collected by citizen scientists and weather radar data of migratory birds from 143 stations across North America. Observations by people were shared with the North American Breeding Bird Survey at the US Geological Survey, the Canadian Wildlife Service, the Audubon Christmas Bird Count and Manomet's International Shorebird Survey."Citizen-science participants contributed critical scientific data to show the international scale of losses of birds," said John Sauer, study co-author at the US Geological Survey. "Our results also provide insights into actions we can take to reverse the declines."The study was published Thursday in the journal 1315

Apple unveiled its latest slate of iPhones on Tuesday at a widely-covered media event at its campus in Cupertino, California.The new lineup includes the iPhone 11, an entry-level device, as well as the higher-end iPhone 11 Pro and 11 Pro Max, which have four-figure price tags.The company's iPhone sales have slumped in recent quarters in part because consumers are waiting longer to upgrade their smartphones. So, is it actually worth it to upgrade to these new models?The short answer: It depends how much you care about better cameras and improved battery life.Here's a look at the key differences between the iPhone 11 and iPhone 11 Pro and two comparable models from the previous year: the iPhone XR, which was the low-end model released in 2018, and the iPhone XS, the higher-end model that year.PriceiPhone 11: Starts at 9iPhone XR: Starts at 9 (originally 9)iPhone 11 Pro: Starts at 9iPhone XS: Like the 11 Pro, the XS originally started at 9. Following the event Tuesday, however, Apple removed this model from its online storeBattery LifeiPhone 11: Up to 1092

Apple has removed 181 vaping-related apps from its mobile App Store globally, the company said on Friday."Recently, experts ranging from the CDC to the American Heart Association have attributed a variety of lung injuries and fatalities to e-cigarette and vaping products, going so far as to call the spread of these devices a public health crisis and a youth epidemic. We agree, and we've updated our App Store Review Guidelines to reflect that apps encouraging or facilitating the use of these products are not permitted," the company said in a statement.Apple said the apps are a mix of stores, social networks, news and games. They represent 0.00010% of the 1.8 million apps available through the mobile App Store, the company said.The company said it had been moving in this direction for months. In June, Apple prohibited the promotion of vaping products in its app store and had not approved any new vaping-related apps since.The apps now banned from the App Store will continue to work for customers who already have them downloaded on their devices, and they can be transferred to new devices.Apple's move was applauded by groups such as the American Heart Association and the ghd Campaign for Tobacco-Free Kids."By taking e-cigarette related apps off the App Store, Apple will help reduce youth exposure to e-cigarette marketing and discourage youth use of these products. Apple is setting a welcome example of corporate responsibility in protecting our kids," Matthew L. Myers, president of the Campaign for Tobacco-Free Kids, said in a statement.Research published recently in the medical journal JAMA found that in 2019, 27.5% of high school students and 10.5% of middle school students currently use e-cigarettes. Based on that data from the National Youth Tobacco Survey, researchers estimated 4.1 million US high school students and 1.2 million middle school students currently use e-cigarettes, and 970,000 use them daily.Aside from the youth vaping epidemic, there were 2,172 cases of lung injury linked to vaping as of November 13, the US Centers for Disease Control and Prevention said on Thursday. The CDC also reports 42 confirmed deaths in 24 states and the District of Columbia.The CDC says it has yet to identify the official cause or causes of the outbreak, but the investigation has increasingly focused on products containing THC. Last week, the agency reported its first "potential chemical of concern": vitamin E acetate?, an additive sometimes used in THC and other vaping products. 2525

An unexpected danger of urban life: Psychotic experiences are more common among teens exposed to the highest levels of nitrogen dioxide and other forms of air pollution, according to a new study. Nitrogen oxides, including nitrogen dioxide, are tailpipe pollutants, entering the air due to burning fuel."One of the most consistent findings over the past few decades has been a link between cities and psychosis," 425