The utopian mythology of hockey stick progress denies the existence of declines, both abrupt and progressive. The Romans had industrial scale milling in modern

The utopian mythology of hockey stick progress denies the existence of declines, both abrupt and progressive. The Romans had industrial scale milling in modern-day France, enough to feed 10-40k people. https://en.wikipedia.org/wiki/Barbegal_aqueduct_and_mills https://en.wikipedia.org/wiki/Barbegal_aqueduct_and_mills Antikythera mechanism predates that by 500 years. I'm curious what technologies were lost for thousands of years. Roman concrete is essentially lost, Silphium is extinct, flexible glass, and Greek fire. Modern technology is lost in bits and pieces: Starlite is one example. Unknown unknowns are the most elusive.