Curling

What It Covers

Curling traces its origins from 16th-century Scottish frozen marshes to Olympic sport status in 1998, with its evolution driven by standardized granite stones, specialized physics, and centuries of Scottish migration spreading the game globally.

Key Questions Answered

• •Stone Origins & Cost: All Olympic-level curling stones use granite exclusively from Ailsa Craig, a small uninhabited Scottish island. A single stone costs approximately $1,000, with a full competitive set running $16,000. Granite harvests occur only every 5–10 years, yielding roughly 2,000 tons per cycle.
• •Two-Granite Engineering: Kays of Scotland constructs each stone using two distinct Ailsa Craig granites — a green granite body for impact resistance and rarer blue hone granite for the running band, which repels water due to its dense, closed molecular structure enabling consistent gliding.
• •Sweeping Physics: Sweepers using carbon fiber brushes generate friction-induced heat that melts the ice surface, actively controlling a stone's speed and direction. Effective sweeping can extend a stone's travel by 10–15 feet — the margin between missing and landing precisely on the button.
• •Unsolved Physics: Despite over 100 years of scientific research, the curling stone's directional behavior remains unexplained. Unlike most spinning objects that drift away from their rotation, a curling stone follows its spin, a counterintuitive friction-induced steering mechanism that scientists have not yet reached consensus on.