Puerto Rico Power Restored, Aviation Safety Under Review, World War II Bomb Diffused, and More Puerto Rico Power Restored, Aviation Safety Under Review, World War II Bomb Defused, and More 4/20/2018 by Holly Gilbert Stowell ASISSMArticleBodyPower has been restored to all 1.43 million homes and businesses in Puerto Rico after an island-wide blackout, USA Today reports. The power outage occurred on Wednesday when heavy equipment workers working for subcontractor Cobra Acquisitions "got too close to a high-power transmission line," triggering the blackout. The same subcontractor was blamed for an outage last week affecting 870,000 Puerto Ricans; the island's governor has said he wants the public power agency to end its contract with the company.U.S. lawmakers are calling for aviation safety hearings after the Southwest jet engine explosion on Tuesday that left one passenger dead. Congress is preparing to take up legislation to reauthorize funding for the Federal Aviation Administration, which has been operating under short-term budget extensions for years, the Washington Post reports. Jennifer Riordan, the sole victim, became the first fatality on a U.S. airline in a decade. Lawmakers have scrutinized the 1,500 hour rule, a standard for pilot training and certification, which some say has led to a shortage and lack of qualification in the labor force.The defusion of a World War II-era bomb in Berlin forced the evacuation of tens of thousands from residences and businesses, CNN reports. The bomb, which contained about 1,100 pounds of explosives, was neutralized Friday morning. "Police have since confirmed that members of the public can return to their homes and buildings inside the 800-meter (half-mile) radius of the site that had earlier been evacuated as a precaution," the article states. The event is not uncommon, as hundreds of similar bombs are found each year in Germany.A former 911 operator in Houston, Texas, was sentenced to jail for hanging up on people calling in for emergency services. "Records showed that thousands of calls lasting less than 20 seconds were attributed to her hanging up," CBS News reports, and she was fired after a supervisor noticed the pattern of short calls.In other news, a virulent strain of E. coli bacteria in romaine lettuce has sent 31 people to hospitals across 16 U.S. states. A handy graphic from Business Insider breaks down how the U.S. federal security clearance system works. The Trump administration still had dozens of people working under interim clearances as of March, according to the Brookings Institution. And the U.S. Environmental Protection Agency's inspector general will begin a second probe into Administrator Scott Pruitt's security detail.