The knowledge map of
human civilization

Fog Net

How to harvest water from fog with a simple mesh — the physics behind the Chilean and Peruvian practice.

Water Purification — Solar and Vacuum Distillation

How contaminated or salty water becomes drinking water through evaporation — from the solar still to industrial vacuum distillation.

Dew Harvesting

How to extract drinkable water from the humidity of the air with no energy input — the physics of radiative cooling.

Hand Well Drilling

Building a shallow well by hand — auger drilling, percussion deepening, and casing in loose sedimentary ground, with water-quality testing as the one step you cannot skip.

Water Wheel

Converting the kinetic or potential energy of flowing water into rotating mechanical work with an undershot or overshot wheel — the millennia-old engine of the mill.

Leather Tanning

How a perishable raw hide becomes durable, supple leather — fleshing, dehairing, and the process of vegetable or brain tanning.

Oil Press

Extracting cooking and lamp oil from oilseeds by mechanical pressure — screw-driven cold pressing and the wedge press at village scale.

Papermaking

Pulping plant fiber, forming sheets with a screen mould, pressing and drying — how writable paper is made by hand, the foundational technology for recording knowledge.

Printing Press Basics

How movable type, ink, and a screw press turn a hand-set line of letters into hundreds of identical printed pages.

Pottery Firing

Shaping plastic clay and firing it in a pit fire or kiln — how mud is irreversibly turned to stone as a durable vessel.

Rope Making

How short plant fibers — hemp, flax, nettle — become load-bearing rope: the physics of counter-twisting, by hand and on a ropewalk.

Smoke Curing

Preserving meat and fish with smoke — the combined effect of salting, drying, and smoke, and the critical difference between cold and hot smoking.

Soap Making

First Aid Basics

The core skills for treating a wound safely — cleaning, dressing, and splinting — until proper medical care is available.

Herbal Remedies

How to identify, harvest, and process medicinal plants into basic home preparations such as teas, tinctures, and salves.

Earthbag Construction

Building durable, low-cost walls and domes by filling bags or tubes with on-site soil, tamping each course, and locking the layers together with barbed wire.

Passive Solar Heating Design

Using a building's orientation, glazing, and thermal mass — tuned to the sun's changing angle through the seasons — to heat and cool a home for free.

Clockwork and Mechanical Timers

How a stored spring or weight, a gear train, and an escapement combine to turn mechanical energy into precise, repeatable timing without any electronics.

Basic Automatic Control Systems

Purely mechanical feedback devices — the float valve, the centrifugal governor, and the bimetallic thermostat — that keep a level, a speed, or a temperature steady without any electronics.

Basic Surveying and Mapmaking

Measuring distances, angles, and elevation on the ground with simple hand tools, and turning those measurements into an accurate scaled map.