Spain’s blood-red Río Tinto river is as acidic as vinegar, and Nasa says it could help scientists find life on Mars | World News
PC: David Santiago Garcia/Aurora Photos/Getty Images At first glance, the Río Tinto in southwestern Spain looks almost unreal. For around 50 kilometres, the water flows in shades of deep red and orange that seem more fitting for an artist’s palette than a natural river. Yet its extraordinary appearance is not the result of artificial dyes…