A roller coaster’s centripetal force could pass your kidney stone, according to James Hamblin’s article for The Atlantic. Urological surgeon David Wartinger, professor emeritus at Michigan State, noticed a correlation of people passing small kidney stones after visiting Disney theme parks. “So Wartinger compiled people’s stories, and he realized that the common factor was having ridden Big Thunder Mountain Railroad,” writes Hamblin. Wartinger took it upon himself to pursue the experiment, using a 3-D model of the kidney, stones and urine, he told the writer. Based on 60 roller coaster rides: “The stones passed 63.89 percent of the time while the kidneys were in the back of the car. When they were in the front, the passage rate was only 16.67 percent,” writes Hamlin. Hence: moderate-intensity” roller coasters could help with passing small kidney stones.