Film gets beat up in the process of being run through a projector several times a day, and a print in heavy rotation may last only days, meaning another copy has to shipped to the theater.

FORBES: Delivering The Digital Movie

Even though I grew up on metal, punk and hard rock and the majority of my listening to this day takes place within those genres, I still keep a heavy dose of pop music in rotation.

FORBES: In Defense of Pop Music and "Guilty" Pleasures

Being simply a rotating horizontal shaft with a heavy vertical load on it, early locomotive axles suffered severe stress reversals in their outer skins with every rotation.

ECONOMIST: Aircraft fatigue