What’s super-fun, kinda scary and has the potential to save the US almost $4B in healthcare costs a year? Rollercoasters, duh. An interesting discovery by Dr. David Wartinger, a urological surgeon who has dealt with kidney stones for decades, was that upon returning from summer vacations to amusement parks his patients came back with fewer kidney stones. Curious about the possibility, he designed a little study, made a model of a kidney and hit the coasters. When riding in the back of the coaster, the model kidney passed the stone ~64% of the time. Armed with some foundational evidence to prove the concept, Dr. Wartinger has planned out a prospective clinical trial to see if the results can be validated.