Nasa has announced that it has found evidence of flowing water on Mars. Scientists have long speculated that Recurring Slope Lineae -- or dark patches -- on Mars were made up of briny water but the new findings prove that those patches are caused by liquid water, which it has established by finding hydrated salts. Several hundred camped outside the London store in Covent Garden. The 6s will have new features like a vastly improved camera and a pressure-sensitive "3D Touch" display

The event many online shoppers have waited for arrives Tuesday. The second iteration of Amazon Prime will offer plenty of deals for customers to grab. The second Prime Day comes after the inaugural event last year that marked the 20-year anniversary of the company. It was the biggest international sales day for Amazon, but many customers were left frustrated as the top products quickly went out of stock. The company is likely hoping for a smoother 2016, which "will feature more than 100,000 deals worldwide exclusively for Prime members, making it the biggest Amazon event ever," it said in press release.