Divisible by five

This is a big divisible-by-five year for me. In 2021, I mark the 25th anniversary of this website and my 60th birthday. This coincidence of mathematics gives me a chance to reflect on the past and look ahead.

As I approach 60, I’m now old enough that body parts stop working properly, and it’s just considered a “normal part of aging.” I recently developed a posterior vitreous detachment in my right eye, or commonly known as a…