If you've ever had the pleasure of having a kidney stone, you certainly don't need a lesson about pain. But just in case that wasn't sufficient, here's some more: a lesson about the chemistry of kidney stones. There will be a quiz. Hope you pass it.
Two physicians studied the effect of Thunder Mountain, a Disney World roller coaster, on kidney stones. They wanted to know whether these crystals, that form in the organ, would move due to forces outside the body. Here's what they found.