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Federal regulators head to Capitol Hill Wednesday following weeks of revelations about problems with the fatally flawed Boeing 737 Max, and as the world awaits a software fix and revised training program from the aircraft's manufacturer.The Federal Aviation Administration's current acting administrator, Daniel Elwell, is expected to face questions from lawmakers about how the Max was certified, and what steps will be taken to assure a skittish flying public that the aircraft can safely return to the skies.The Trump administration's nominee for the job, Stephen Dickson, will testify at a separate hearing. Dickson is a former Delta Air Lines executive and military pilot, and has not yet publicly commented on the 737 MAX or its grounding, which occurred days before his nomination was announced. In a Senate questionnaire prior to the hearing, Dickson identified safety as one of his qualifications for and priorities on the job.The FAA is waiting on Boeing to complete a software update for its review. The 737 Max 8 and 9 were grounded worldwide after a second crash in Ethiopia two months ago that investigators have described as appearing similar to an October crash into the Java Sea. Between the Lion Air and Ethiopian Airlines crashes, 346 people were killed.When Elwell testified in late March, about two weeks after the Ethiopian crash, he defended the agency's process for grounding the plane. Other countries that acted days earlier, he said, without the data that the FAA waited for.Since then, news reports have revealed how the FAA certification process allowed Boeing officials with authority delegated from the FAA to certify their company's own work.Elwell will be joined by the agency's executive director of aircraft certification, Earl Lawrence, and two officials from the National Transportation Safety Board, which represents the United States in the Indonesian and Ethiopian investigations.Preliminary reports on both crashes have implicated a flight control system that Boeing designed to operate in the background, making the 737 Max fly like earlier versions of the workhorse jetliner. Maintaining enough similarities between the planes avoided costly pilot training programs, a fact Boeing touted as a selling point.But that computerized stability program -- the Maneuvering Characteristics Augmentation System, or MCAS -- received faulty sensor readings in both the Lion Air and Ethiopian jets, and repeatedly pushed the planes' noses downward, and ultimately into steep dives. The pilots' attempts to overcome it were unsuccessful. As is standard practice, the preliminary reports did not lay blame for either accident.The emergency flight procedure Boeing says pilots should rely on when the system malfunctions has not been substantially updated since the 1960s and is now under FAA review, CNN recently reported.But Boeing admitted its software could be improved to break what it described as links in the chains of events that ended in the crashes.Boeing did not perform a flight test of a scenario where the system malfunctioned, CNN has reported. 3100

Globally, we are ingesting an average of 5 grams of plastic every week, the equivalent of a credit card, a new study suggests.This plastic contamination comes from "microplastics" -- particles smaller than five millimeters -- which are making their way into our food, drinking water and even the air.Around the world, people ingest an average of around 2,000 microplastic particles a week, according to the study by the University of Newcastle, in Australia.These tiny particles can originate from a variety of sources, including artificial clothes fibers, microbeads found in some toothpastes, or bigger pieces of plastic which gradually break into smaller pieces when they're thrown away and exposed to the elements. 730

Former President Jimmy Carter may have spent three days in the hospital, but the 94 year-old is expected to teach Sunday school at his beloved Maranatha Baptist Church in Plains, Georgia, this weekend.Carter was released from the hospital Thursday morning, the Carter Center announced, and will continue to recuperate at home. He was admitted Monday after a fall on his way to go turkey hunting, and later underwent a successful surgery at the Phoebe Sumter Medical Center in Americus, Georgia."He will undergo physical therapy, as part of his recovery from hip replacement surgery. President Carter plans to teach Sunday school at Maranatha Baptist Church this weekend," the Carter Center said in a statement.In March, Carter became the oldest-living former president in US history. The former president fought cancer in his liver and brain, announcing his 870

HARTFORD, Conn. – The nation's two largest teachers unions are calling on schools to revise or eliminate active shooter drills. The American Federation of Teachers and National Education Association issued a report Tuesday with the advocacy group Everytown for Gun Safety Support. They assert that simulating a school shooting can harm the mental health of students and educators. They say schools should instead concentrate on training teachers to respond to emergencies. Jean-Paul Guilbault, the chief executive of the Alice Training Institute, which runs active shooter drills, says they are effective when done appropriately. 641

Former Vice President Joe Biden is projected to win the Democratic primaries in Michigan, Missouri and Mississippi on Tuesday, after winning 10 out of 14 states on Super Tuesday. With Biden's win in Michigan, he earned a state that was won by Sen. Bernie Sanders in 2016. Winning Michigan was the biggest prize in Tuesday's six-state primary with 125 delegates up for grabs. Democrats award delegates proportionally, but Biden could rack up a large delegate haul between Michigan, Missouri and Mississippi.The races in Idaho, North Dakota and Washington have not been called.DELEGATE MATH:March 10 primaries:Biden: 131Sanders: 72Overall:Biden: 801Sanders: 646Needed to win: 1991Sanders entered Tuesday's set of primaries trailing Biden in national delegates. It appears the gap between Biden and Sanders will grow from Tuesday's votes. As votes were tabulated on Tuesday, former candidate Andrew Yang announced he is endorsing Biden."I believe Joe Biden will be the Democratic nominee....and I hereby endorse Joe Biden," Yang said. 1044