Old brains are busy, making/maintaining new/er mental maps. Remembering

to hold onto the railing while navigating up or down the stairs.  While outside, keeping their (failing) eyesight for chuck-holes while rolling the wheel-barrow to that spot, where they'd left off working yesterday.  Old brains tell the body, hey einstein, you need to go sit in the shade for a few minutes - you're old enough to keel over from heart attack.  Old brains remind the arms to carefully take the box off the shelf (not just grab it any old way).  

And isn't it amazing, at the day's end, how much an old person is able to get done, on his or her own ;)  It's called, using one's noggin, and it's also called work ethic - yeah, the latter somehow not quite all there, in these quik-draw trivia-chase daze.  

Yep, there's more to brain activity than teevee game-shows.  There's books.  Books that don't prod/invalidate the reader into instantaneously absorbing the information therein.  As a matter of FACT, worthy writers expect the reader to take his or her time.  Worthy writers have put alot of research into their works, and they hope their contribution won't be forgotten - like last tuesday's teevee gameshow.