I was pretty shocked when New York-based periodontist Alan Winter told me that two dental diseases -- dental decay and periodontal disease -- are two of the three most common diseases. (The third most-common disease is the common cold.) I hadn't thought about dental disease in those terms, and apparently neither does most of the population.

I met a man last week who told me how Dale Carnegie changed his life. Back around 1970, a few years into his career, Donald took the Dale Carnegie course, which is based on Carnegie's classic book How to Win Friends and Influence People.