alt Hacker NewsBack in the early 2000's, well before most social media sites existed, I had a coworker who shared with me a number of questionable theories, one of which was basically this. He also believed very passionately that plate tectonics was wrong. Unfortunately social media didn't invent brain worms.
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Depending on how much older he was than you at the time, he might genuinely have been taught in high school that this was wrong. Only in the early 1970s did that even start to gain traction. If he was taught by one of the hold-outs that esteemed a pre-tectonics geologist, it'd be pretty natural to think like that I imagine.
Plate tectonics was super controversial at one point. Would be a common one for conspiracy theorists of a certain vintage.
Social media gave a geographically distributed population of the “quirky” and their natural predators the grifters a chance to mingle on a global scale. It didn’t invent anything, but it’s a vector for the pathogen.
Was he reading Neal Adams?
I have to admit - Expanding Earth is hard to debunk!
I think because like Flat Earth many of the observations and elements therein are accurate - they just get the overall picture wrong.
Like stealing the ball with 4 sec left running down the court no defense in sight for the winning layup and missing - comically bouncing off the backboard.
Alas, I believe most crackpots mean well, they just aren’t very good at the sport