The Zevco fuel cell uses an efficient, silver-based catalyst to promote the electricity-producing reaction, instead of a traditional platinum one.

ECONOMIST: Clean living in Iceland

Expect another soon, which could be a catalyst (as it was with silver).

FORBES: Why I'm Short Gold: Because No One Else Is

There has been no single fundamental catalyst for the panic selling in the gold and silver markets the past two trading sessions.

FORBES: P.M. Kitco Metals Roundup: Gold, Silver Slammed to 2-Year Lows on Panic Selling