You’re a time traveller and you’re going back to Roman Times. What are you going to invent for them?

I could tell them about mobile phones or television but no idea how they actually work.

I think something like a bicycle might be explainable and perhaps able to be manufactured.

Please nobody go back and show them modern weapons as that's not going to end well.

What could you take back and introduce to the world for the benefit of mankind?

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