Measuring Fun

My friend Charles has been actively retired for many years. He sends me mysterious packets of notes and articles. I call him. The other day we were having a discussion about some of the many things he does for fun. His most recent project is finding every reference he can to the word "measurement."

He explained to me that he was looking in the encyclopedia (an actual, analog, hard-covered-with-pages encyclopedia) and happened across the word. In the article, the writer said that the concept of measurement is fundamental to all sciences. And that sent him off.

For me, this was another lesson in how a sense of play and curiousity can keep the mind alive. What is it for you?