Jo Beth was getting stupid.  Really stupid.  She kept forgetting
the simplest things, and couldn't think at all when even slightly
tired.  One day, she found herself standing at the whiteboard
unable to continue the Math lesson because she'd forgotten how
to subtract.

Also, her spatial awareness was entirely gone.  The little girl
who had once understood her engineer father's blueprints had
become the woman who now had trouble figuring out not only
how to open the new marker box, but which end to open.  For
the first time ever, she now had trouble reading maps.

All of Jo Beth's mental processes had become sluggish.  She  
took an IQ test.  Her IQ had dropped 30 points, just like the
"after" rats  in "
Flowers for Algernon."  She knew just how
Charlie felt.
Entropy

Where Jo Beth's brain accelerates its downward spiral.
Study Questions:
Would you want this woman for your
child's teacher?
Are you kidding?  
Jo Charlie realizing she's
losing her smart marbles.
Click here just
'cause you're bored.
Not THAT Charlie.
Maps became a mystery,
(Direction sense was history!)
Not that one, either.