The response you posted seems to be referring to various concepts from theoretical physics and philosophy, specifically the ideas of the Everettian interpretation of quantum mechanics, anthropic reasoning, and the Born rule. Let's break these down:
Everettian interpretation of quantum mechanics: Also known as the Many-Worlds interpretation, it suggests that all possible alternate histories and futures are real, each representing an actual "world" or "universe". In layman's terms, it's the idea that there could be countless parallel universes where every possible outcome of an event happens.
Anthropic reasoning: This is a philosophical consideration that observations of the universe must be compatible with the conscious and sapient life that observes it. In other words, our ability to exist and observe influences how we should interpret the universe.
Born rule: In quantum mechanics, the Born rule is a statistical law that connects the mathematical formalism of quantum theory to experimental observations. It provides the probability that a measurement on a quantum system will yield a given result.
The responder seems to suggest that in a universe with many possible futures (as the Everettian interpretation would suggest), we are more likely to observe "black swan" events that lead to more possible futures.
The idea here is that if an event significantly increases the number of possible futures (like a breakthrough that extends human lifespan), then it effectively increases the number of "observer-moments". In other words, more possibilities for observers to exist and make observations. According to anthropic reasoning, this could make these events more likely to occur than pure chance would predict, because we're only able to observe futures in which we exist.
This line of reasoning is highly speculative and philosophical in nature, touching on deep and unresolved questions in physics and philosophy. It's an interesting thought experiment, but it's important to note that this isn't widely accepted or proven in the scientific community as of my knowledge cutoff in September 2021.
