Are any old technologies still useful today?

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Hey, I was just wondering can anyone think of any old technologies that are still valid today or are even better than new technologies? I was reading about Zeer pots that are used in Africa to keep food cool (where they don't have fridges) - I think they are a great idea, as they save on electricity, and I don't have a lot in my fridge anyway. How did people in the old times live, and surely if they did it, we could do it (to some extent anyway)? Thanks.