For the first time, scientists have discovered evidence of bacteria hiding in 'noninfectious' kidney stones. These hardened clumps of small crystals are made from chemicals in urine and are thought to form due to a lack of fluid or a high concentration of minerals and chemicals. Most kidney stones are considered noninfectious after they are passed . But that may not be true after all. A study led by researchers at the University of California Los Angeles (UCLA) has now found that calcium