How Much Knowledge Have We Lost?

In the ancient past, we had knowledge in lots of domains. How itt preceded science or techne presilevestime is engineering. The romans s had phenomenal recipes then that definitely were vastly more effective than medicine. And they had a self reinforcing concrete, concrete that thettht under stress, get stronger. But you see that technology is seen as something is application of science to practical affairs - but i have a different root in mind.