Today's post, Fundamental Doubts was originally published on 12 July 2008. A summary (taken from the LW wiki):

There are some things that are so fundamental, that you really can't doubt them effectively. Be careful you don't use this as an excuse, but ultimately, you really can't start out by saying that you won't trust anything that is the output of a neuron.


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I like how if you combine this post with You Only Need Faith in Two Things, they basically solve the problem of induction for all intents and purposes. It’s impossible to unwind past some very basic, very weak assumptions, and they’re all you need to reinvent the entire Bayesian epistemology => you might as well assume it’s correct.