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

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As others have pointed out, the basic scientific method isn’t what’s changing, but the conclusions that it leads to sometimes do. There are many famous examples.

Newton had explained the laws of motion and the law of gravity. Eventually Einstein upended both. Newton’s versions work well under most circumstances that humans normally encounter, but not more extreme ones.

Einstein was also the one who upended the previous belief that you couldn’t destroy matter or energy; you could only change their form. Turns out you can change either one of those into the other.

But for every major example like these, there are many many examples where the conclusions based on science were right, and many examples where it was mostly right and only minor refinements have happened over time.