We lost the knowledge of concrete for the better part of a millenium after the fall of the Roman Empire and we've only recently begun to understand how the rockets that sent astronauts to the moon worked less than 50 years ago.
http://arstechnica.com/science/2013/04/how-nasa-brought-the-monstrous-f-1-moon-rocket-back-to-life/
Secrets of ancient Roman concrete could make modern structures more durable, cut emissions
It’s no secret that the Romans were better at producing concrete than we are today. Modern concrete begins to deteriorate after 50 years or so of facing the elements, whereas structures engineered…
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