One bit of blogging advice is to pick a single topic and focus on that. The idea is to attract and keep those interested in the topic. I tried that with my first blog, a baseball blog, and I have a separate blog for computer programming. (For the record, neither attracted anyone, so maybe it’s me. 😮 )
This blog does have a central topic — “Stuff That Really Interests Me” — but my tastes are pretty eclectic. Math theory, 3D modeling, and basic physics fascinate me, but so does baseball, beer, and Hawaiian volcanoes. (Not to mention the Mandelbrot and science fiction, both very dear to my heart.)
Right now I’m into commercial aviation.