Roman Concrete: the whole path
4 inventions to master first, in an order where each one only needs those before it.
- 1
- 2
- 3Building & CitiesII
Lime and lime mortar
Burnt stone that turns back to stone
10,000 years agoneeds 1, 2
- 4
- 5
4 inventions to master first, in an order where each one only needs those before it.
Burnt stone that turns back to stone
10,000 years agoneeds 1, 2