I love this expression, which I heard from a professor at the Harvard Business School while attending an executive course about lifelong learning. I have always thought that a lifelong learner is probably the ideal. These are people who continually learn new things every day, week, month and year. They expose themselves to things beyond their normal interests just to see what is happening in the world.
I was talking to a very successful businessman recently who told me that every night he goes on the internet and does a random search to read about a totally unfamiliar subject—just for the fun of it. I was very impressed by this concept and started doing it myself. It reminded me of being younger and learning new things all the time... a feeling that I was starting to miss.
Dentists, like all specialized individuals, tend to become more myopic over time. Their intense concentration on their specialized area is understandable given how hard it is to keep up with new developments and technologies. The problem is you tend to stop learning new things in your personal life.
My suggestion would be to take 15 minutes a day and learn something new. First off, it's entertaining. Plus, it'll relieve stress, broaden insights, create better understanding, lead to more innovative ideas and make you a better leader. Not bad for an investment of 15 minutes a day.