what do people mean when they say science is always changing, and what is the example of science changing?

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Medical: from chopping off limbs > leeches > simple medicines > advanced vaccines

Astronomy: from myths > stars > geocentricism > telescopes/ heliocentricism > Theory of Relativity

Agriculture: from “hunting and gathering” > planting and irrigation > preserving and refrigeration > modern farming techniques

Tech: from wheeled carts > cities > spaceflight > Reddit