Commonly prescribed drugs used to treat high blood pressure have been shown to, over time, wreck the kidneys' ability to filter and purify blood, but exactly how that dangerous side effect unfolded has been a riddle. Researchers say they've solved the mystery. Researchers found that the drugs essentially rewire the kidneys to do something other than the important work of filtering blood. The kidneys start producing more of a hormone called renin; nerve endings grow excessively; cells lining the kidneys' tiny blood vessels get too large; scars form and spread; and inflammation sets in, which "can take a terrible toll...