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My take:
Most things (especially abstract ones) that exists beyond the scope of the small-hunter-gatherer-tribe setup our brain is developed for: Quantum mechanics, climate change, racism, relativity, spherical earth, ...
What separates us from the dogs is that we've developed abstract analytical tools (language, stories, mathematics, the scientific method,....) that allow us to infer the existence of those things and, eventually try to predict, model and manipulate them.
But we don't "grasp" them as we'd grasp a tangled leash, which is why it is even possible for medically sane people to doubt them.
I'd argue that you can even flip this around into a definition:
If a person with no medical mental deficiencies can honestly deny a fact (as in: without consciously lying), then that fact is either actually wrong, or it falls into the "tangled leash" category.
idk spherical earth isn't that highbrow to me
Yes it is indeed easy to grasp in certain areas of the earth.
Yeah, with the right situation you can just plainly see it.
This thread has a lot of visualisations of exactly how you can see it, it's actually really viscerally satisfying:
https://www.metabunk.org/threads/soundly-proving-the-curvature-of-the-earth-at-lake-pontchartrain.8939/