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Sen. Bernie Sanders on Monday released a decade of tax returns, providing new insight into how the Democratic socialist senator from Vermont 153

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

Rosalaind P. Walter, the woman who inspired the character "Rosie the Riveter," died Wednesday at the age of 95.According to 136

Rep. Seth Moulton will end his presidential bid on Friday during a speech at the Democratic National Committee summer meeting in San Francisco, according to prepared remarks of the speech the Massachusetts Democrat plans to deliver.The decision closes out a campaign in which the candidate failed to get traction or make this year's Democratic debates."Today, I want to use this opportunity, with all of you here, to announce that I am ending my campaign for president," Moulton plans to tell the DNC meeting. "Though this campaign is not ending the way we hoped, I am leaving this race knowing that we raised issues that are vitally important to the American people and our future."Moulton, a Marine veteran and three-term congressman who represents Boston's northern suburbs, will tell the audience that he plans to run for reelection to Congress and relaunch Serve America, a PAC that looks to elect Democrats with service backgrounds."I will continue to fight for a new generation of leadership in our party and our country," he plans to say. "And most of all, I will be campaigning my ass off for whoever wins our nomination in 2020."Moulton entered the race later than most -- in late April -- and failed to catch on with more than 20 Democrats vying to take on President Donald Trump.The congressman failed to register in national or statewide polls and did not garner the needed fundraising to qualify for either the June or July Democratic debates.Moulton centered his bid on his personal military service and traveled the country to talk about his plan to incentivize national service at events during which the congressman personally did a service project. Moulton had hoped that his focus on national security and service would set him apart in the large Democratic field, but the congressman was boxed out by other military veterans -- namely Hawaii Rep. Tulsi Gabbard and South Bend, Indiana, Mayor Pete Buttigieg.Moulton has told staff and friends that he plans to continue pushing the Democratic Party on issues that motivated his campaign, like issues facing veterans, the need to incentivize national service and the importance of a comprehensive strategy around national defense.Those efforts will commence on Monday when Moulton hosts a town hall for veterans in Fairfax, Virginia, alongside General Stanley McChrystal, a military leader who endorsed Moulton's 2020 bid.Aides to the congressman said they hope that he could be in line for a host of administration posts, should a Democrat in the White House in 2020, including secretary of veterans affairs, defense secretary and United Nations ambassador.Moulton is the latest Democratic candidate to get out of the 2020 race, following California Rep. Eric Swalwell, former Colorado Gov. John Hickenlooper and Washington Gov. Jay Inslee. 2821

Sears' decline continues to accelerate as on Friday the company announced that it will close 80 Sears and Kmart locations in March. The announcement came on the same day that Sears faced a deadline to find a seller for the company as part of its bankruptcy. The 80 locations that will close in March is in addition to 40 locations that are scheduled to be shuttered in February. Of the 80 locations to close, 43 are Sears stores and 37 are Kmart. To see a full list of stores closing, click 503