Another interesting thing i happen to know about bearings:
Huge ball bearings are used under buildings to allow them to move, or actually
stay still, during earth quakes.  A large cup, bigger than the ball by 
quite a bit, is mounted on the foundation, and another inverted similar cup
on the bottom of the building.  A single huge ball goes in the cups.  Thus
with many of these cup bearings, the entire building rolls, when the ground
moves the building hopefully moves less, rolling on the balls.

Of course special flexible entry ways, and utility service pipes etc.
need to be used in these buildings.

tom



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