If “they” didn’t decide that 5 is a number in the first place, how could they change and decide it’s not?

If some group of professors got together and decided to declare that 5 isn’t a number, how could that affect the real world?

They could send out some guidance of how math teachers are supposed to teach differently, but schools would all ignore it. There just isn’t any organization with that kind of power in most of the world.

Even if in, say, North Korea, they decided to try that, it would probably involve creating a new symbol or word for 5.

Math simply does not work if you try to pretend that adding 4+1 is impossible.

I guess the point I’m trying to make is that there is no “they”. There is no board of experts that can make a declaration like that. It’s an extremely childish worldview to believe that there could be (again, aside from places like North Korea).

Humans realizing that they were wrong to label Pluto the same way they labeled Neptune, Uranus, etc. does not affect anything that happens in space. It’s the reverse, actually — when humans realize that their labeling systems are wrong, the humans must change. If a human scientist insists that since they learned xyz when they were a child, xyz must be true, despite evidence, then that human is not a true scientist and is harming humanity.

Saying “Actually, Pluto isn’t really a planet” (that is, “Actually, bodies in space under a certain size have certain properties that make them different from planets”) is no different from saying “Actually, the Earth revolves around the Sun and not the other way around” all those centuries ago.

The whole “dwarf planet” thing was done to placate people who are uncomfortable with science, and that’s something any thinking person should be uncomfortable with.

(Also, if there were a board of scientists that powerful, tobacco would no longer be a thing. If only.)