What clearly emerges from Mr Griffin's account is a view of the court not as the final arbiter on constitutional questions, but as only one element in a tripartite system of government designed to divide power and create friction between the three branches.

ECONOMIST: The politics of justice

But if the building is well pivoted to reduce friction, that requires surprisingly little power.

ECONOMIST: Monitor

Another cause of friction has been the Kozloduy nuclear power plant, which supplies over a third of Bulgaria's electricity.

BBC: Bulgaria profile

Other improvements include a friction-fit docking connector and improved power management, along with a few other under-the-hood enhancements.

ENGADGET: Send your 'Hiro P' BUGbase back, get a BUGbase WiFi for $99

Designing friction out of pipes and ducts can save 10 times as much fuel at the power plant.

FORBES: Magazine Article

They worry about the growing power of the Sunni sheikhs within the police force, that could lead to more friction with the Shiite-dominated government in Baghdad.

NPR: Sunni Sheiks Join Iraqi Police to Fight Al Qaida