sleep on it

how to solve it: think of the problem, understand the conditions, then think about something else and let your subconscious mind to work it out:

"Complex decisions are best left to your unconscious mind to work out, according to a new study, and over-thinking a problem could lead to expensive mistakes."

Science (vol 311, p 1005)

утро вечера мудренее!

Alzheimer's & IQ

Alzheimer's Progresses Faster in Educated People:
Previous studies have shown that people with high levels of education are less likely to develop Alzheimer's disease. The new study shows that the brains of more educated people can tolerate changes for longer periods of time, meaning signs of decreased mental agility typical of Alzheimer's disease appear later. When those signs do appear, the disease progresses faster than it does in less educated patients.

it appears that high IQ leads to later onset of senility - and to lower probability thereof; but once senility comes - it progresses quickly.