Brown Motion

These two words were quite mysterious, growing up or when I first started understanding the English language.  Also my growth (as it were) amidst a bunch of relatives that had an occupation that involved printing literature in the local newsmedia added to the puzzle. Who had to stop and what did they press?  Of course the realization that 'Press' meant anyone from the news organization (at least at that time) or a journalist of some kind impressed me with the idea that stopping them during their runabouts was not a smart thing to do. If you see a frenzied journo the last thing you want to do is get in their way.  You will be the one that gets pressed much akin to being gored by a bull during the inhuman sporting practice followed by people in Northern Spain.  They call it running with the bulls.  Now who has more sense in the melee that follows is debatable but you get the idea. Anyway the reason for the title and the long preamble to the main me...