Changed in example sentence

I use planet Earth to go in very extreme environments where conditions were similar to those of Mars at the time when the climate changed, and there I'm trying to understand what happened.

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But in the last few decades that has totally changed.

In the end, if we test everyone by hand in exams, it's kind of hard to get the curricula changed to a point where they can use computers during the semesters.

So I want to see a completely renewed, changed math curriculum built from the ground up, based on computers being there, computers that are now ubiquitous almost.

We squashed it, we rethought it, but mainly we renamed it "the heart of school," and that changed everything forever.

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