Windmill: the whole path

1
Tools & MakingI
Stone Tools
The first cutting edge
3.3 Mya
2
Fire & ShelterI
Control of Fire
Light, heat and cooked food
1 Mya
3
Fire & ShelterI
Rope & Cordage
Twisted fibres that hold the world
50,000 years ago
4
Materials & ChemistryII
Pottery
Clay turned to stone by fire
18,000 years ago
needs 2
5
Materials & ChemistryII
Charcoal
Wood cooked slowly under earth
c. 4,500 BCE
needs 1, 2
6
Land TransportII
Wheel & Axle
Rolling instead of dragging
c. 3,500 BCE
needs 1
7
Materials & ChemistryIII
Bronze
Copper and tin, harder together
c. 3,300 BCE
needs 2, 4, 5
8
MechanicsIII
Gears
Teeth that trade speed for force
c. 300 BCE
needs 7
9
Energy & Prime MoversIII
Water Wheel
A river turned into work
c. 300 BCE
needs 6, 8
10
Energy & Prime MoversIII
Windmill
Wind turned into flour
c. 900
Goal · needs 3, 8, 9