This blog is ten years old! I made the first post, Trefethen’s Approximation Theory and Approximation Practice on January 1, 2013. 347 posts and over one million views (for the combined website and blog) later, the aims of the blog are unchanged: to cover numerical linear algebra, software, and numerical analysis and applied mathematics more generally.
In the last three years most of my posts have been in the What Is series, which now has 84 articles. I will continue to add to this series, and will be grateful for any suggestions of topics (please put them in the “Leave a Reply” box below).
There is a lot of content on this site. The best way to find specific information is to use the gray search box at the top right of the page. I use it frequently, often finding things I’d forgotten are here.
Image credit: Bernie Goldbach.
Nick Higham 
Congratulations on achieving the 10 year milestone. Looking forward to the next 10 years! On possible posts what about a survey of papers that used insight from the relationship of a condition number to the distance (in some sense) to the nearest ill-posed problem?
What Is the Matrix Concentration Inequalities?
Congratulations!
I might not have commented before, but I have been responsible for some of those 1e6 views 🙂