A connection
How did Plow and Harness lead to Insulin therapy?
8 steps · 7 domains · 5,922 years
- Plow and Harness~4,000 BC · 4,000 BCYoking oxen — and later, properly harnessed horses — to plows and carts, giving farmers the first working power source stronger than a human back.
- 使之可造 ↓Heavy moldboard plow~900 AD (heavy plow spreads) · 900 ADA heavy, wheeled, iron-shod plow that does not just scratch the soil but cuts a slice of it and flips it fully over — a vertical knife, a horizontal blade, and a curved board working together to bite into and turn dense, wet clay that a light plow only skids across.
The heavy plow is useless without a strong draft team; harnessing animals to pull is a hard prerequisite, not merely an inspiration.
- 有赖于它的是—— 使之可能 ↑Iron Smelting (Bloomery)~1,500 BC · 1,500 BCReducing iron ore to workable metal in a charcoal-fired clay furnace.
The share and coulter must be iron to hold an edge biting through clay, stones, and roots.
- 使之可能 ↓Navigation~1090 AD (magnetized needle described 1088; compass at sea by ~1119) · 1090 ADThe compass, the chart, and the stars — the toolkit that lets a ship leave sight of land and arrive somewhere on purpose.
- 有赖于它的是—— 使之可想 ↑Numbers and Geometry~3,400 BC (token accounting) · 3,400 BCWays of counting, calculating, and measuring shapes — the mental tools that turn "some sheep" into "seventeen sheep" and "that field" into "so many paces on each side."
- 使之可想 ↓The Scientific Method~1620 AD (formalized) · 1620 ADA procedure for telling truth from confident nonsense: guess, then test the guess against the world, measure honestly, and let anyone check.
- 使之可想 ↓Atomic theory1808 (A New System of Chemical Philosophy) · 1808 ADThe claim that every element is made of identical atoms with a fixed weight, and that compounds form when those atoms join in whole-number ratios — which is why elements always combine in the same definite proportions by mass.
Dalton's atoms were inferred from measured mass ratios in real reactions — a quantitative argument from evidence, not a revival of ancient speculation.
- 使之可想 ↓Biochemistry1828 (Wöhler's urea) · 1828 ADThe recognition that the molecules of living things are made of ordinary atoms obeying ordinary chemistry — no special "vital force" required — so that life's substances can be analyzed, weighed, and built in a flask.
Seeing urea as the very same atoms of ammonium cyanate merely rearranged requires the idea that a compound is a fixed assembly of atoms.
- 使之可想 ↓Insulin therapy1922 AD (first patient) · 1922 ADThe isolation of insulin — the pancreatic hormone that lets the body take up and use blood sugar — and its use to keep people with type 1 diabetes alive. Before it the diagnosis was a death sentence; a team at the University of Toronto extracted, purified, and first injected the hormone into a patient in 1921–22.
Isolating one specific hormone from a mash of tissue, keeping it intact, and proving it acts is a problem in biochemistry.
Every link in this chain is a verified dependency — not a trivia association. Explore either end: Plow and Harness or Insulin therapy.