Geological curiosity: Mars "blueberries" reveal what ancient Mars may have looked like

(Natural News) The “blueberries” of Mars are not the least bit organic, much less edible. But the small, ferrous spheres strewn across the surface of Mars could tell us about the Red Planet during the time when liquid water flowed across its young face. First discovered by NASA’s Opportunity rover in 2004, the hematite-rich geologic features...