Is there any evidence of modern technology today that has been rediscovered? [closed]

Question

Is there any evidence of modern technology or high population today that has been rediscovered? The earth has frozen over multiple times surely there is an example like this.

For example

• computer like technology
• cars
• high billion population

Answer 1

Question:.
Is there any evidence of modern technology or high population today that has been rediscovered?

Not due to ice age but certainly due to wars and the fall of civilizations.

The antikythera mechanism, found inside a Roman shipwreck near the Greek island of Antikythera, was an ancient mechanical computer thought to be at least 2,000 years old. It's believed that this complex clock-like device was used by ancient Greeks to calculate the movement of the stars and planets.

Roman Concrete Europe lost the ability to make concrete altogether after the fall of Rome and even up til the end of the 20th century modern concrete lacked the durability of concrete which the Romans used. Have you ever seen old cracked concrete? Roman Concrete has lasted two millennium. Some Roman Concrete that old was used for underwater construction. 20th century concrete could never stand up to that kind of use. It wasn’t until relatively recently that we figured out the formula which the Romans used to make such durable concrete structures.

Byzantine Greek fire. An early chemical or pyrotechnic weapon. Modern scientists still don’t know how to make that.

Universal antidote said to cure all poisons developed by King Mithridates VI of Pontus (who reigned 120–63 B.C.) and perfected by Emperor Nero’s personal physician.

Damascus Steel incredible strong durable steel made famous during the medieval times, modern steel workers could not reproduce the technique until the 21st century when electron microscopes were used to reveal quantum structures like “cementite nanowires and carbon nanotubes.” In the medieval steel.

Mongol Bow. Technology still lost to the modern age. We know roughly how they were made but not the specific techniques used to manufacture and tune them. Modern attempts to recreate this super weapon of its time fail to produce the same range and are based upon a rival archery tradition.

Mongol Bow
The Mongol bowmaking tradition was lost under the Manchus, who forbade archery; the present bowmaking tradition emerged after independence in 1921 and is based on Manchu types of bow.[44] Mounted archery had fallen into disuse and has been revived only in the 21st century.

Sources:

• Why Modern Mortar Crumbles and Roman Concrete Lasts Millennia
• Composite Bow
• Physics and Engineering of New Materials Damascus Steel
• Universal antidote
• antikythera mechanism