I gave the stats-school seminar this morning, on PCA and its limitations. I have so much to say about this. I should write something for the arXiv. I have ranted in this space before about PCA. But at the same time, it is super-effective. That's why making small changes to PCA which make it more responsible, more robust, more probabilistically righteous, and better justified will just pay us all dividends. We bid goodbye to Brewer after lunch; it has been a fun week, and we have a chance of doing something super-cool with the Kuiper Belt.