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An MIT professor fired a gun in a lecture hall to teach students one formula. The recording is online. The topic sounds boring on paper: velocity and acceleration. Then he pulls out a rifle. He wants the speed of a bullet. No modern sensors, just two wires and a...

47,612 views • 23 days ago •via X (Twitter)

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A Stanford neuroscientist has spent thirty years arguing that you have never made a decision. Not one. Every choice you are proud of and every mistake you still think about was the output of biology you did not pick and cannot see. He teaches an entire course on why, and it is free. The man is Robert Sapolsky, who spent decades in Kenya living among wild baboons. He opens with a man who woke up one morning as somebody else. Same brain, same family, same job. One gene had changed. He describes the case and leaves it unresolved, because the point is not the answer. The point is that you already reached for one. Then he goes after the way we reach. His argument is that every explanation you have ever heard for why a person did something is broken in the same way. It is genetic. It is cultural. It is hormones. It is childhood. Each of those is a bucket, and the buckets do not exist anywhere in nature. They exist because universities have separate departments and separate corridors, and the corridors decided what counts as an explanation. Nothing interesting happens inside a bucket. Everything interesting happens where two of them touch, and almost nobody is trained to look there. He asks the room about free will, about God, about evil, about whether biology explains who becomes religious, and whether things that happened before you were born shape your politics thirty years later. Then he refuses to answer any of it, and tells them what they will be able to judge for themselves in ten weeks. The lectures run through aggression, depression, language, schizophrenia, sexuality, and why any of it differs between two people at all. Twenty five hours. One lecture hall. Free.

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Jeff Bezos on the exact moment he realized he would never be a great physicist: "I really was determined to be a theoretical physicist. It's why I went to Princeton in the first place. And then I realized I was going to be a mediocre theoretical physicist. There were a few people in my classes, in quantum mechanics and so on, who could effortlessly do things that were so difficult for me." "Theoretical physics is not one of those fields where only the top few percent move the state of the art forward. It's one of those things where your brain has to be wired in a certain way." "My friend Joe and I were working on a very difficult partial differential equations problem set one night, and there was one problem we worked on for three hours. We made no headway whatsoever. And we looked up at each other at the same time and we said, Yasantha." "He stared at it for just a few seconds, maybe 10 seconds, and he said, cosine. And I said, what do you mean, cosine? He said, that's the answer. And I said, no, no, no, come on. And he said, let me show you. And he took out some paper and wrote down three pages of equations, everything canceled out, and the answer was cosine." "I said, Yasantha, did you do that in your head? And he said, oh no, that would be impossible. A few years ago I solved a similar problem, and I could map this problem onto that problem, and then it was immediately obvious that the answer was cosine." "You have an experience like that, you realize maybe being a theoretical physicist isn't what the universe wants you to be."

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Eric Schmidt on what he calls "the San Francisco consensus": "There's a group of people that I work with. They're all in San Francisco and they've all basically convinced themselves that in the next two to four year, the average is three years the entire world will change." He's careful to flag the catch in that word "consensus": "It's true that it's a consensus, but it's not necessarily true that the consensus is true." So why do these people believe it? Eric walks through the reasoning. First came language-to-language models. "ChatGPT is the best one, they did a great job," he says, with everyone else catching up. Then came two additions: reasoning, and memory inside these systems. Put those together and you get what he calls the agentic revolution: "The agentic revolution… can be understood as language in, memory and language, language out." To make it concrete, he uses a deliberately mundane example. Say he wants to build a house in California. One agent finds the lot. Another works out the rules. Another designs the building. Another selects the contractor. And, at least in America, another agent sues the contractor when the house doesn't work. The point of such a "stupid example," as he puts it, is exactly that it's ordinary: "I just gave you a workflow example that's true of every business, every government and every group human activity." That's why he thinks the consensus carries weight: "When you understand that the agentic revolution and the reasoning revolution together really changed the way we operate as humans, then you understand why the San Francisco consensus is so powerful." On the reasoning side, he points to models that work a problem forward and backward: "It will blow your mind away, especially when you ask it a question that you have no idea what the question is about and you watch it reason." And he cites the numbers he's seeing: "Google now has a math model that is at the 90 percentile of math graduate students." More broadly, he claims, "we now have systems now that are 90% of all of the graduate school skills. You know, math, physics, and so forth." When something can do that, he argues, "it will happen at a big scale." This is where the consensus reaches its sharpest point: recursive self-improvement. "There's a moment when what is called recursive self-improvement, the system begins to learn on itself, where it goes forward at a rate that is impossible for us to understand. It becomes combinatorial in a way that we as humans do not understand." His verdict on all of it is two-sided: "This is both incredibly exciting and also very worrisome."

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