Just a thought experiment, let’s say the earth is flat, looks like many professionals would know, including
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Pilots/ATC/sea captain
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Land surveyor and civil engineers
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Astronomers and Geologists, at least the one dealing with experimental data
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Militaries, at least radar operator and artillery
Just these categories are already a lot of persons, I assume I miss a lot of others. So how many person does it make in total ? 10 % of the population ?
I was going to add other groups that would have to be in on it, but it is only required that you are all not real.
I am real. My family is real. But outside maybe 30 miles from my house, no one else needs to be real.
Sure, I can and have driven farther, but the trackers alert the actors. This has the advantage of the Earth’s population can be just a few hundred thousand total.
Why? Clearly, I am the last truly important person, for reasons that are not yet clear.
So … 50,000 people are in on it at least. And they are… 40%+ of the Earth’s population.
Edit: to finish the thought. OP’s 10% puts those in on it at 800 million people. My 50 thousand is a much smaller number.
Your family isn’t real either. Neither is your house. This is all a product of your nascent consciousness.