Curling takes the world by storm every four years, but many fans don't know much about the stones used.

Every stone thrown at the Olympic curling tournaments comes from the same place — the remote island of Ailsa Craig, off the Scottish coast.

The rocks used in the Olympic sport of curling come from one island in Scotland and one quarry in Wales. What makes them so ...

The most common type of stone contains calcium (KAL-see-um). Calcium is a normal part of a healthy diet. Calcium that is not used by the bones and muscles goes to the kidneys. In most people, the ...

You get kidney stones when your pee has a high concentration of minerals and other substances--like calcium, oxalate, and uric acid--that come together to make crystals. The crystals then stick ...