Patients have been reporting to urologists for decades that they were cured miraculously. Here’s how it happens. Somebody with kidney stones gets on a roller coaster. Then they get jostled and jarred for a few minutes. When the ride is finally over, they are miraculously rid of their kidney stones. Naturally, a scientist just had to confirm the validity of this tale, so he conducted a study where he used a 3-D-printed kidney with kidney stones inside that he tucked away in a backpack. Then, with his backpack on his back, he boarded the Big Thunder Mountain Railroad roller coaster at Walt Disney World some 20 times to see if the stones would move. In the results he published Monday, it turns out that they did. The violent motion dislodged the stones. The new Rx for kidney stones…a trip to Disney World. Insurance pre-authorization required.