Science is the process of discovering and when discovering new things, you got to categorize and measure and come up with a way to explain it.
So, we observe protons and electrons. And we see hmm, protons act the opposite as electrons do when in a magnetic field. Hmm.. there must be some property about the electron and proton that makes them do the opposite, what should be call this property? Lets call it, ‘Electric Charge’, ok. Now what? Well, since protons and electrons act opposing, let say charge is up and down since they are opposites as well. No, that doesn’t sound good, what about positive and negative? That sounds better, lets do that. We’ll call the proton positive and the electron negative because, why not, but we need to make sure everyone else everywhere says the same thing so lets write a science paper explaining this to the world and get everyone to agree, proton is positive and electron is negative so we can all talk the same.
That’s how all this works.
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