As a first offering... I'll go with something I find very interesting
Apparently until age 4... Most children are what we would call geniuses in multiple areas of thinking and that declines over the years until by age
20, only 10% of us are.
Something fascinating about this, why do some of us hold onto our genius and most don't, Use it or loose it?
genius
dip
and on the negative side...
short term stress
apparently short term stress, affects Intelligence in a fairly dramatic way
I chpose these first two, to compliment each other
If we are essentially all or almost all born geniuses, and short term stress is a contributor in terms of cognative decay...
The envoronment plays a major role...
the first thing that comes to my mind here is... the effect of constant war and talk of war on the global populations children and developing brains,
second, economics... as we eneter a depression, what is most needed is intelligent thought to find our way past this...
yet it would seem a constant bombardment of "bad news" leading to short terms stress can only cause the issue to become worse...
thios would also tie into divorce, split families, poverty... a myriad causes of "short term stress"