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I was thinking of realistic discoveries which could have great effect on Rome and early Europe.

Earlier I have mentioned paper

But the blast furnace is also a possibility, in OTL it was developed before Christ in China, so it's a quite realistic discovery. What effect would a improvement in the quality and quentity of steel and iron have?

One of the more interesting I could see, would be earlier development and earlier spread of heavy plough, which could increase the Roman presence in North Europe.
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