YouTube
Channels and videos worth watching deliberately — not algorithmically. Saved because they explained something physical or analytical better than anything I'd read.
Grady's explanations are the best in the field because he never hides the engineering trade-offs. This video on maglev was the first time I understood why EMS (electromagnetic suspension) and EDS (electrodynamic suspension) solve the same problem with completely different risk profiles. EMS needs active control to stay stable; EDS is passively stable but only above a minimum speed. That distinction is the entire reason my own model uses EDS — and why I had to solve the launch velocity problem.
This video made me appreciate how much of critical infrastructure operates invisibly, maintained by small teams under regulatory frameworks that most people have never read. The economics of maintaining aging infrastructure — where the marginal cost of delay is always lower than the cost of action until suddenly it isn't — is one of the most important and poorly understood problems in public finance. I've come back to this framing repeatedly when thinking about greenfield vs. brownfield investment.