* Net present value.
* Fencepost security.
* Linearity.
* Fermi estimate.
* Phase transition.
* Backpressure.
* Dimensional analysis.
* Efficient markets hypothesis.
* Action versus worldstate averaging ([[https://www.lesswrong.com/posts/FMkQtPvzsriQAow5q/the-correct-response-to-uncertainty-is-not-half-speed]]).
* Bayesian evidence.