This "blog" was largely motivated by friends who recommended I add this as a section to my website - not that I will be sharing anything particularly groundbreaking (for that see Paul Graham's website). I recently got a whiteboard and find myself working on random problems, often over breakfast. I find it useful to write down what I work on - explaining stuff tends to help the explain-er just as much as the explain-ee. Some posts might be longer discussions on bits of maths/CS/physics I stumble across, others might be a one-off interesting problem.
I also try to read/write about things less so stem related. For that, have a look at my substack.