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roller coasters

Roller coasters may help you get rid of kidney stones.
wikipedia

Sometimes science moves in a mysterious way.

A few years back, urologist David Wartinger, a former Michigan State University professor, saw a student patient who he'd been treating for kidney stones. The patient had just returned from spring break in Florida.

"And he told me, doc, you're not gonna believe this, I went on a roller coaster and I passed a kidney stone. I got right back on the same coaster, I passed another stone. I got back on the coaster a third time and I passed three stones in a row."