@RapAdmin had brought up simulation theory in the USA longevity thread so I thought it was interesting enough to break out into it’s own topic. I thought these two videos were a good intellectual exercise about simulation theory - that we are all living in a simulated reality.
The first is the double slit experiment from the Royal Institute.
The second is a lot more out there but covers the Mandela effect which is also quite interesting .
Just food for thought…
Hopefully not calorically restricted. 
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I love the The Why Files (WF?). The guy is one of the most entertaining people on YouTube.
He always gives the best-known real answer at the end of his videos.
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I’ve only watched two of their videos - the one linked above and another which was obviously fake.