there are a few big issues here.
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The consistency and efficacy of that pathogen
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those people wouldn't be zombies, they would just be carnivores.
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if cannibalism/societal colapse/megetables are going on, people are going to notice.
there are already pathogens that make someone vegetarian, but because of the resilience of the human body, the effect only takes hold in a very low percentage of people introduced to the pathogen (they're not sure which mechanism in tick spit prompts the meat allergy yet, afaik).
The brain is incredibly complex and can rewire itself, so to have even 10% of the population have consistently perfectly rewired brains while maintaining all other normal functions and the coordination to conspire, cannibalize people and change the global food supply is a pretty magical scenario.
for sure! I love talking about this stuff.
if you join an online platform with in-place curriculum, then they assign you to classes so the students are already there.
I didn't want a schedule, so i made myself available to casually chat with ESL learners on an app called palfish.
enough people called me up for me to make a few hundred a month, which is all I needed to travel. dorms are $100 a month in SE Asia, food is 1 to $4 a portion in all of asia, and I was backpacking half the time anyway.
when I landed in a country, I bought the unlimited data-only plan, clicked the "online" button, and then people called me up whenever they wanted to practice their english with me.
that online work was partially to offset using my savings, but i had already taught in person for ~7 years.
with each month of in-person teaching affording me ~3 months of living expenses, i had enough savings to travel for a couple decades by the time i started traveling full-time.
quick note: there's no competition for ESL students at the teacher level. there are way too many ESL students and not nearly enough English teachers to fulfill the demand. it's not even close.