Book excerpt: In his bestselling book The Memory Bible, Dr. Gary Small showed us how to improve our memory by changing our diet and lifestyle and by incorporating physical and mental exercise. Now, in response to readers' requests, Dr. Small offers The Memory Prescription -- a simple, effective two-week program to improve memory quickly. Based on years of medical research at one of the country's leading memory loss institutions, Dr. Small focuses on 'the Big 4' : mental activity, healthy brain and body diet, stress reduction, and physical fitness, and he offers a step-by-step regimen that can be customized to each reader's specific needs.