Had Jewish ancestors. This was different from historic anti Semitism because it defined Jewishness as hereditary (race) rather than by practice (religion). Three categories of Jews were created: "Full Jews," who either practiced Judaism or had at least 3 Jewish grandparents, regardless of religious practice; "First Class Mischlinge" (Half Jewish), who had 2 Jewish grandparents, didn't practice Judaism, and didn't have a Jewish spouse; and "Second Class Mischlinge" (One Quarter Jewish) who had one Jewish grandparent and did not practice Judaism
The "secret weapon" of Rome's engineers that enabled them to build bigger, stronger, and faster than anyone else was "water-proof concrete."
The water-proof concrete in the Roman empire was made of volcanic ash, seawater, and lime.
The concrete made the Roman Empire engineers construct buildings and bridges quickly without worrying about reinforcement or the weight and stress the building load would carry.
The waterproof concrete in Roman Empires also helped their building construction to avoid cracks appearing on the structure.
Hence, in this case, it is concluded that the "secret weapon" of Rome's engineers that enabled them to build bigger, stronger, and faster than anyone else was "water-proof concrete."
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China developed the same attitude toward business that was was emerging in Europe mostly because it was clear that this more capitalist, mercantilist, way of operating was more beneficial for the state, since it brought in more revenue.