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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

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

Renters are really struggling to save anything after paying their monthly rent costs, which are up 1.5 percent across the United States. A two-bedroom rental is averaging ,180 per month. 200

Robert Mueller has been subpoenaed by the House Judiciary and Intelligence Committees to testify on July 17 to address the special counsel's probe into the 2016 election. Mueller previously said that his report would act as his testimony, and he would not say anything beyond what is in the report. “The report is my testimony. I would not provide information beyond that which is already public in any appearance before Congress," Mueller said last month.In his report, Mueller found that the Trump campaign had multiple contact with the Russian government during the 2016 election. Although Mueller concluded that the Russians' involvement in the election was illegal, the Trump's campaign ties to the Russians did not amount to a criminal conspiracy. Mueller's team also investigated a number of obstruction of justice allegations involving President Donald Trump. Mueller could not make a judgment on Trump's guilt as he said that Department of Justice guidelines suggest a sitting president cannot be criminally charged. 1038

SEOUL, South Korea — South Korea is reporting its first death from a new virus, as the mayor of a southeastern city urges its 2.5 million people to stay inside as infections linked to a church congregation spike. The mayor of Daegu says citizens should wear masks even indoors if possible. The city and nearby areas have reported 56 new cases in the past two days. The mayor says the rising infections could soon overwhelm the city’s health system and is asking for urgent help from the central government. Health officials say many of the new patients went to services at a church that were attended by a previously confirmed virus patient or contacted her elsewhere. 680