Kidney stone disease occurs when minerals in urine collect and combine in the kidney... and over time, building up like a jawbreaker in reverse, into larger and larger stones. These stones typically form in the kidney itself, and many smaller stones are passed without symptoms. Other, larger stones can form, causing great pain, blood in the urine, nausea, and vomiting.

Sound effects in this episode courtesy of "Disney's Big Thunder Mountain Railroad, A.wav" by InspectorJ of Freesound.org

Links:

• Contact Us: Level 989
• Kidney stone disease - Wikipedia
• Validation of a Functional Pyelocalyceal Renal Model for the Evaluation of Renal Calculi Passage While Riding a Roller Coaster | The Journal of the American Osteopathic Association
• Big Thunder Mountain Railroad - Wikipedia
• Roller coaster - Wikipedia
• Freesound.org - "Disney's Big Thunder Mountain Railroad, A.wav" by InspectorJ