Safety cut rope axe man In the first nuclear reactor, constructed by Enrico Fermi in 1942 under the bleachers of the University of Chicago football stadium, the control rods were held up by a manila rope. A man with an axe was told to cut the rope if the reactor got out of hand. This "safety cut rope axe man" is supposedly the origin of the term SCRAM for an emergency shutdown procedure. Brian Hayes, Infrastructure: A Guide to the Industrial Landscape wordsacronymsenergy
Evergreen notes A Definition by Andy Matuschak notes.andymatuschak.org Evergreen notes are written and organized to evolve, contribute, and accumulate over time, across projects. This is an unusual way to think about writing notes: Most people take only transient notes. Evergreen notes should be atomic Evergreen notes should be concept-oriented Evergreen notes should be densely linked Prefer associative ontologies to hierarchical taxonomies Maggie Appleton's Digital Garden notetakinglearning