Regular use of cognitive techniques to exercise the brain "smarter" is a proven method of improving thought agility and mental flexibility. In today's world where you need to be able to think on your feet even during the "low" times of the day, these are worth practicing. May I also recommend "The Care and Feeding of Your Brain" as a companion guide to optimize general brain function as you exercise it with Eiffert's neat techniques...Ken Giuffre MD, author "The Care and Feeding of Your Brain"