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Screen time use by infants, toddlers and preschoolers has exploded over the last decade, concerning experts about the impact of television, tablets and smartphones on these critical years of rapid brain development.A new study scanned the brains of children 3 to 5 years old and found those who used screens more than the recommended one hour a day without parental involvement had lower levels of development in the brain's white matter -- an area key to the development of language, literacy and cognitive skills."This is the first study to document associations between higher screen use and lower measures of brain structure and skills in preschool-aged kids," said lead author Dr. John Hutton, a pediatrician and clinical researcher at Cincinnati Children's Hospital. The study was 799

Projects to reduce the risk of wildfires and protect water sources in the U.S. West have created jobs and infused more money in local economies, researchers say, and they were funded by a partnership between governments and businesses that has become a model in other countries.A team from the U.S. Geological Survey reviewed work being done in several counties along the New Mexico-Colorado border that make up the watershed of one of North America’s longest rivers, the Rio Grande. The review shows how public-private partnerships could become a critical component for safeguarding the land and benefiting the economy amid the threat of federal funding cuts and worsening wildfires brought on by climate change.The 729

Since the year began, 47 law enforcement officers across the US have been shot and killed in the line of duty, including a police officer in California making a traffic stop on the morning after Christmas.The parameters CNN followed in this count are:The officer was fatally shot this yearThe officer was on duty at the time of the shooting"The tragic deaths ... (are) a stark reminder of the dangers our law enforcement professionals face each and every day while protecting and serving our communities," 518

SALT LAKE CITY — A Salt Lake City Police officer is being investigated by the department after being filmed pushing an elderly man walking with a cane to the ground during 184

SURPRISE, Ariz. — While hundreds of Valley Vista High School seniors walked across the stage for graduation Thursday, one student wasn't even allowed inside the venue.LaRissa Waln showed up to her graduation ceremony at State Farm Stadium in Glendale, Arizona, but was stopped at the doorsby her school's vice-principal. Waln was told she'd have to remove her decorated cap, which she had decorated with Native American patterns and trum, and exchange it for a blank one."I was sad for a moment," she said, "But that just means I get to be out here and stand up for what is right."She and her family, some who flew all the way from South Dakota to watch Waln graduate, stood outside the stadium in protest."It's not just for her, we're fighting for all the ones that follow her," Bryan Waln, LaRissa's father said. "There are other Native American kids out here that would love to practice their religion on graduation day." 936

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