Spurred by a near epidemic occurrence of brain-degenerating conditions as we age, people of all ages and backgrounds are stepping up their personal efforts to improve and maintain their brain health. According to a story in USA Today, sales of brain fitness software reached nearly $230 million in 2007. USA Today stated, "SharpBrains, (a market research firm) estimates the brain fitness software market will reach $2 billion in 2015 in the United States."

Prudent investment strategy might include a speculative foray into this popular and growing field. In light of this, you may wish to pay heed to blogger Steven Mallas, and read his take on Activision (NASDAQ: ATVI).

First on the list for brain maintenance is physical activity, which probably accounts for the outstanding sales of Nintendo's Wii Fit. from Nintendo Ltd. (OTC: NTDOY). Active lives promote healthy blood circulation, which helps to feed steady amounts of oxygen to the hungry brain. Good hard work, cardiovascular exercise and even regular sexual activity can all help to keep your heart pumping adequate levels of oxygen into your brain.

Stupidity is no barrier to wealth: That's the conclusion of a study by Jay Zagorsky, a research scientist at Ohio State University's Center for Human Resource Research. Based on a study of 7,403 Americans who participated in the National Longitudinal Survey of Youth, Mr. Zagorsky found no correlation between IQ and wealth: "Those with low intelligence should not believe they are handicapped, and those with high intelligence should not believe they have an advantage."

But here's what really interesting: Smart people do earn more money. They just aren't particularly likely to save and invest it, which is a recipe for creating wealth. According to the data, each extra IQ-point coincided with an extra $202 to $616 of income a year

So smart people earn more money but apparently fritter it away (Mensa memberships perhaps?). So does that mean that saving money is stupid? Or, are smart people just not very smart when it comes to money?