Roller coasters are fast and exciting. But passing a painful kidney stone is not. The process is painful and can take a long time. But American researchers have found that a roller coaster ride just might help those suffering from a kidney stone. They say such rides help patients pass the stones with a 70 percent success rate. The findings come from researchers at Michigan State University. They published their findings in The Journal of the American Osteopathic Association. David Wartinger led the study. He says he became curious after hearing many stories of people who passed kidney stones after going on a fun ride at a theme park in Florida. Patients told him that after riding a “roller coaster at Walt Disney World, they were able to pass their kidney stones.” One man even said he passed three different stones after going on the ride more than once!