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Staffers at some of America's best-known newspapers are wondering whether their systems were the victim of a foreign cyberattack.Several papers, including the Los Angeles Times and The San Diego Union-Tribune, suffered printing and distribution delays as a result of the incident.Some reporters chuckled at the irony of a digital bug interrupting printed papers. But there is also real concern about the effectiveness of the attack.Tribune Publishing said "malware" was detected on its servers Friday. The Union-Tribune, 533

Stocks, already rattled by the US-China trade war, were set to fall sharply Friday after President Donald Trump announced new tariffs on Mexican imports.Dow 169

Since it landed on Mars in 2012 NASA's Curiosity rover has been exploring Gale Crater, a vast, dry ancient lake bed with a mountain at its center. Now, Curiosity has found sediments containing sulfate salt in the crater, which suggest it once held salty lakes.A range of salts have been found on Mars in different locations. Researchers interpret these as evidence of ancient brines. Salty water formations seemed to increase on the Martian surface as the planet transitioned to an arid climate 3.5 billion years ago.The new detection of sulfate salts came from sedimentary rocks dated to between 3.3 and 3.7 billion years ago. Curiosity has analyzed other, older rocks on Mars and didn't detect these salts in them.Researchers believe the salt is evidence of the crater's lake evaporating in the Red Planet's arid environment. They also believe studying younger rocks in the future could shed more light on how the Martian surface dried out.Gale Crater was created by an ancient impact, then filled in with sediment layers over time. Mount Sharp, the mountain at its center, was created by wind erosion of the hardened sediment layers. Those same layers act like chapters in the history of Mars and provide clues to its environment at each point in time.At the time the sulfate salts were present, lakes were probably scattered across the crater floor, fed by streams in the crater walls. Over time, the streams would overflow and then evaporate, trapped in a repetitive cycle taking place over millions of years.The findings were published Monday in the journal 1576

South Korea has reported its biggest jump in coronavirus cases in more than 50 days. Health officials say the resurgence is getting harder to track and social distancing and other steps need to be taken. The health minister pleaded for people to avoid unnecessary gatherings and urged companies to keep sick employees off work. Dozens of infections were linked to an e-commerce warehouse that may not have used prevention measures. In other developments in Asia, India reported a surge of cases before new guidelines are made this weekend on the country's lockdown. 577

Safety Alert: If your child is 3 months or older, or if your child can roll, stop using your Fisher-Price Rock ‘N Play. 10 deaths since 2015 occurred when infants rolled from their back to their stomach or side, while unrestrained. Learn more: 256