Simple discoveries that would radically change ancient times or middle ages?

I am kind-of on the edge about air travel. On the one hand, a hot air balloon is so simple that any medieval army should have their observation balloons to scout out the enemy's movement. The same goes for gliders. just the realisation that an aircraft can do without flapping wings as long as it has a tail for stability is so deceptively simple that one wonders why people only found out about it in the 1850's. Surely someone like Leonardo Da Vinci could have found out in 1500 already. Surely some ancient Greek or Egyptian could have built the first model glider way before there was a Parthenon to launch it from.

Then again, both gliders and balloons require massive amounts of extremely light woven fabric. And with medieval fabric production still literally being a cottage industry, even a simple balloon would probably only be in reach of a wealthy royal court, not something one would see in an army train or on a battle ship.
 
In terms of something that could be practically discovered and implemented, pasteurized is a good bet. Increasing the shelf life if your food and drinks would be helpful in improving the health of sailors and practical range of voyages, reducing the expenses of shipping (the best way to do bulk transport). Increased trade, better economics, all produces a virtuous cycle that speeds up developments elsewhere
 
earlier crop rotation is another cool idea
You had a form of crop rotation, bi-annual, practiced in Roman agriculture and that remained in place roughly until the agricultural revolution of the XVIIIth-XIXth centuries in southern Europe (in its larger sense). As with other medieval agricultural devellopment (such as the heavy plough), it really had an impact (and a really important one) in Northern Europe.

Keeping in mind the idea of simple discoveries, devellopment of wheelbarrow in Antiquity (Roman or pre-Roman) would be a very important devellopment in not only agriculture but as well all kind of important works.

Similarily, the devellopment of an early railway in Antiquity could have long lasting impact; altough I don't expect having iron railway appearing first but on the model of the diolkos of Corinth, either in limestone or wood.

Eventually, and I'm surprised nobody mentioned it already : you could have a Roman use of trip hammer, or if we consider they did used it, a much larger use than IOTL. We're talking important structural advance in mining and mettalurgy there.
 
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Albert.Nik

Banned
Did nobody think about rational philosophy? It would have helped them immensely and would have unlocked a lot of Science and given them immense capabilities when the population of the World was still low. 99% of the people in the Mediaeval ages were fundamentalists.
 
Did nobody think about rational philosophy? It would have helped them immensely and would have unlocked a lot of Science and given them immense capabilities when the population of the World was still low. 99% of the people in the Mediaeval ages were fundamentalists.
What would you call Greek philosophy but rational.
 
Yes. Just revive that.
You might want to read The Greeks and the Irrational by E.R. Dodds. It wasn't all roses and wine. Also, everyone was fundamentalist religiously until Darwin, never mind the Middle Ages. But remember that it was usually quite casual, not like the concentrated, angry reactions against modernity and social liberalism that make so many of us antipathetic to fundamentalism. But then it didn't need a siege mentality.
 
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Pkmatrix

Monthly Donor
The Steam Engine seems like an obvious one, as the principles and the basic idea were known going back to Rome.

Another, though less obvious, one is Photography. Cameras were invented WAY before Photographs, and it's not unbelievable that a Medieval monk or alchemist could become interested in silver salts' ability to darken in light (something known going back to like the 1200s, I think) and follow the same path that led to the discovery of the silver chloride/ammonia combination that led to the first photographs in the early 1800s.
 
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