Many things matter to me, but I tend to write about technology, user interfaces, and education. For more ephemeral topics, follow me on Twitter. Sunday, September 12, 2010. My first two slide rules have arrived. One was metal and yellow, pegging it most likely as being a Pickett.

Computer Science and Engineering for K-12. How the Internet Works - Part IV - DNS. This is the fourth in a 4-part post that describes an activity to demonstrate how the internet works.

The First Edition is still available! .

Monday, October 7, 2013. Social power in computing and its affect in early CS education. This morning that summarized work on how people tend to dismiss those with less social power in a given situation. The article is unfortunately titled around money, even though the point of the article is much broader, looking at the implications for public policy if high-power people dismiss those below them. Saturday, September 21, 2013.

How to Write Seemingly Unhygienic and Referentially Opaque Macros with Syntax-rules. How to Write Seemingly Unhygienic and Referentially Opaque Macros with Syntax-rules. Why Is SQLite Coded In C. From the SQLite website is instructive, as is reading the page. On the tooling and coding practices that make this approach work.

Is a textbook for beginning computer programming, published in August 2010 by College Publications. Pre-publication drafts of it have already been used by dozens of high school and college teachers in several countries.