“If in fact there’s a reverse takeover, with the McDonnell ethos permeating Boeing, then Boeing is doomed to mediocrity,” the business scholar Jim Collins told me back in 2000. “There’s one thing that made Boeing really great all the way along. They always understood that they were an engineering-driven company, not a financially driven company . If they’re no longer honoring that as their central mission, then over time they’ll just become another company.”
I saw it as an example of why the open-closed principle (I almost wrote oped principle) is important. I found it brilliant: most regular shopping is actually “pantry staples”, which are covered here. So you’d mark the “missing usuals” and have a separate list for the unusual.
The last chalk picture comes from Linda Keen’s whiteboard. I met her many years ago, awesome mathematician. I’d personally recommend A topological picturebook to learn more about “mathematics drawing”, particularly in chalk.