When you first go to blog, establish your credibility with your chosen subject. After a while, it helps to break the monotony of daily posts on one subject if you vary it up a little bit. for instance, I desginate my Friday posts for lighthearted, comical posts that usually have nothing to do with blogging. If you’ve seen some of those posts, you know what I’m talking about. You may not enjoy the humor but it provides a nice relief for all of us. you can do the same thing. If your focus is on physics, take one posts and write about someone got their lab coat zipper stuck. Have fun. Spread some humor.