Remembering my friend and former student CPT Dave Fraser, KIA in Iraq on November 26, 2006. You lived an exemplary life, Dave, but it was far too short. May it be said, "Well done, be thou at peace."

I’m excited to announce that my new Great Courses lecture series—“Understanding the Marvels of Medieval Technology”—has just been released. In this course, you’ll learn about castles, cathedrals, catapults, carracks, clocks, cannons, and more—all from an engineering perspective. Link below.

My front door. As Trump sides with the Axis of Evil, it’s important for all of us to show our true colors.

Superb update, with many reasons for optimism. #NAFO #SlavaUkraini

I recently visited Musée d'Orsay in Paris and was blown away by Claude Monet's Rouen Cathedral series. These five paintings, side by side, depict the cathedral facade under widely different atmospheric conditions. Of course, the subject of these paintings isn't really the cathedral; it is light.

Some of my best friends are Fellas.