Maybe another rover mission could confirm that the deposits or errosion are recent events caused by water.
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"The new products have features that the iPod doesn't have, such as an ability to upload music directly to the device from a CD player and a noise canceller, which erases surrounding noise, so users can better hear their music. Sony said the new Walkmans targeted consumers who found it complicating to use computers to manage their music as well as music lovers, who sought better sound quality." - WSJ