Welcome to The Nonlinear Library, where we use Text-to-Speech software to convert the best writing from the Rationalist and EA communities into audio. This is: [Linkpost] Practically-A-Book Review: Rootclaim $100,000 Lab Leak Debate, published by trevor on March 28, 2024 on LessWrong.

Lots of people already know about Scott Alexander/ACX/SSC, but I think that crossposting to LW is unusually valuable in this particular case, since lots of people were waiting for a big schelling-point overview of the 15-hour Rootclaim Lab Leak debate, and unlike LW, ACX's comment section is a massive vote-less swamp that lags the entire page and gives everyone equal status.

It remains unclear whether commenting there is worth your time if you think you have something worth saying, since there's no sorting, only sifting, implying that it attracts small numbers of sifters instead of large numbers of people who expect sorting.

Here are the first 11 paragraphs:

Saar Wilf is an ex-Israeli entrepreneur. Since 2016, he's been developing a new form of reasoning, meant to transcend normal human bias.

His method - called Rootclaim - uses Bayesian reasoning, a branch of math that explains the right way to weigh evidence. This isn't exactly new. Everyone supports Bayesian reasoning. The statisticians support it, I support it, Nate Silver wrote a whole book supporting it.

But the joke goes that you do Bayesian reasoning by doing normal reasoning while muttering "Bayes, Bayes, Bayes" under your breath. Nobody - not the statisticians, not Nate Silver, certainly not me - tries to do full Bayesian reasoning on fuzzy real-world problems. They'd be too hard to model. You'd make some philosophical mistake converting the situation into numbers, then end up much worse off than if you'd tried normal human intuition.

Rootclaim spent years working on this problem, until he was satisfied his method could avoid these kinds of pitfalls. Then they started posting analyses of different open problems to their site, rootclaim.com. Here are three:

For example, does Putin have cancer? We start with the prior for Russian men ages 60-69 having cancer (14.32%, according to health data). We adjust for Putin's healthy lifestyle (-30% cancer risk) and lack of family history (-5%). Putin hasn't vanished from the world stage for long periods of time, which seems about 4x more likely to be true if he didn't have cancer than if he did. About half of cancer patients lose their hair, and Putin hasn't, so we'll divide by two.

On the other hand, Putin's face has gotten more swollen recently, which happens about six times more often to cancer patients than to others, so we'll multiply by six. And so on and so forth, until we end up with the final calculation: 86% chance Putin doesn't have cancer, too bad.

This is an unusual way to do things, but Saar claimed some early victories. For example, in a celebrity Israeli murder case, Saar used Rootclaim to determine that the main suspect was likely innocent, and a local mental patient had committed the crime; later, new DNA evidence seemed to back him up.

One other important fact about Saar: he is very rich. In 2008, he sold his fraud detection startup to PayPal for $169 million. Since then he's founded more companies, made more good investments, and won hundreds of thousands of dollars in professional poker.

So, in the grand tradition of very rich people who think they have invented new forms of reasoning everywhere, Saar issued a monetary challenge. If you disagree with any of his Rootclaim analyses - you think Putin does have cancer, or whatever - he and the Rootclaim team will bet you $100,000 that they're right. If the answer will come out eventually (eg wait to see when Putin dies), you can wait and see.

Otherwise, he'll accept all comers in video debates in front of a mutually-agreeable panel of judges.

Since then, Saar and his $100,000 offer have been a fixture of Internet debates everywhere. When I argued that Vitamin D didn't help fight...