German tank design lost sight of what makes a tank good: a big gun and thick armour matter less than ease of maintenance and reliability.

design How things should be made and judged: what makes a design good, who should do the designing, and what an interface is for.

simplicity Less, but better: reduction as the way to make something good, and the argument about when it goes too far.

war Armed conflict and preparing for it: military spending, alliances, and what changes when machines are in the loop.