Comment by ChrisMarshallNY

In my case, I'm a bit obsessed. I'm "on the spectrum," and that helps me to concentrate and understand stuff.

Also, I just like doing this stuff. My work is also my hobby. There's not that many things that I'd rather be doing.

I have also had a very good venue for doing volunteer work, and that has always provided a driving force.

Of course, now that I'm retired, I have the time.