Open Thread 440

This is the weekly visible open thread. Post about anything you want, ask random questions, whatever. ACX has an unofficial subreddit, Discord, and bulletin board, and in-person meetups around the world. Most content is free, some is subscriber only; you can subscribe here. Also:1: Update on the Lumina dental probiotic: their postmarket testing found that the original bacterium couldn't maintain its colonization of the mouth over the long term. They’ve suspended sales while they experiment to see if they can fix this. If they can, they plan to send a free vial of v 2.0 to everyone who bought the original strain, then repeat postmarket tests. They also announce that the government of Singapore has expressed interest in their product if it can pass an FDA trial, so if they succeed at fixing the colonization problem to their own satisfaction, they'll start raising money for a formal study.2: Thanks to everyone who entered the book review contest or voted in the first round. The following…