Diff of Concepts at 97a3937

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+* 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.
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