Now, even though it may be difficult to understand how a huge mass of ice can move—or flow, it's another word for it—it's really no secret that glaciers flow because of gravity.

The new technologies of mass dissemination could reach large numbers of people with unprecedented speed and efficiency, but put control of the flow of information into the hands of a select few.

Inspect the system for any indications of reaction, leaks, changes in mass flow, or changes in delivery pressure across line filters.