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For question about societies that have not yet reached the industrial revolution. It covers a large period of time.

4 votes

Are there any crops or agricultural practices well suited for a cool and very wet climate?

As a former resident of the region, I can confirm that western Washington and Oregon have a thriving dairy industry, produce many seasonal vegetables, and are significant contributors in the farmed lu …
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3 votes

Atmospheric pressure engine train in the 15th-16th century

Generally, atmospheric engines have a very low specific power production -- enough so that I doubt you could build a practical train with one even with 20th century manufacturing technology. If you l …
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2 votes

Could plastic have been made in the medieval period?

Any alchemist could have made nitrocellulose, one form of which is celluloid -- the oldest commercial plastic -- if only they'd known how. In the real world, this was discovered in the 19th century, …
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30 votes

Area denial organism for pre-industrial human beings on Earth

Gorse is already pretty close to this. The plant itself is like a combination of wild blackberries, thistle, and hawthorn. If the climate is right (cool and damp) it will spread like those weeds, gr …
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