Specifying suitable linear bearings involves careful consideration of load capacity, life expectancy, preload, lubrication, material compatibility and environmental factors.

Nonlinear phenomena are phenomena, which, in contrast to a linear system, cannot be explained by a mathematical relationship of proportionality (that is, a linear relationship between two variables).

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Peter Cohan's stories. Peter Cohan, a Boston-based senior contributor, covers stocks.

What happened to those base-stealing, high on-base guys who used to thrive atop major league lineups? Guess what: They're gone.