Drying, salting, smoking, fermenting, cellars and granaries, then refrigeration and the cold chain.
Still be eating in March what you grew in August.
Needs first: Plant staples, Containers (Materials), Fire, and keeping it (Energy)
Cross-listed. Its home is Materials & Chemistry › Chemicals.
Secure a mineral you cannot live without and cannot grow.
Needs first: Fire, and keeping it (Energy), Containers (Materials)
Cross-listed. Its home is Materials & Chemistry › Chemicals.
Put microbes to work — your first biotechnology.
Needs first: Pottery and the first kiln (Materials), Plant staples, Blacksmithing (Tools)
Hold food and medicine at a set cold temperature, all year, anywhere.
Needs first: The steam engine (Energy), Coal and coke (Energy), Blast furnace and cheap iron (Materials), Instruments and measurement (Knowledge)
Every guide, build, reference sheet and book reached from the steps above.
A glut eaten in the week it arrives is a feast. The same glut dried, salted, fermented or cellared is the difference between March and a famine.
Level 0The highest calorie-return food source available to a group with nothing — and the one most often worked in the least productive way.
Level 3The two dozen that decide who lives where there is no doctor: what each does, how it spreads, what kills it and which step stops it.
Level 3Life from the cell up: the human body, microbes and immunity, inheritance and epidemics. Each result with what it lets you do and who first found it.
Level 3The basic set from the WHO list: what each treats, what it is made from, and the earliest tier that can make it. No doses, on purpose.
Level 1The poisonings a rebuilding community is most likely to meet: where each comes from, how it shows, and the first thing to do.
Level 3Force, energy, heat, light, electricity, relativity and the atom: the laws every engine, wire and lens obeys, each with what it lets you do and who first found it.
Keep a year of grain dry, cool and away from rodents — the single highest-return building on the site.
Cold, damp and dark, without power — how a harvest survives to the following spring.
Clean drinking water with no chemicals, no power and no moving parts — the highest lives-saved-per-effort structure on this site.
Drawn overview sheets, each with its corrections printed under it. They orient; they are never the thing you identify from.
