This is the bi-weekly visible open thread (there are also hidden open threads twice a week you can reach through the Open Thread tab on the top of the page). Post about anything you want, ask random questions, whatever. You can also talk at the SSC subreddit or the SSC Discord server. Also:

1. I’ve added an entry to my Mistakes page regarding my post about hallucinogen persisting perceptual disorder. Based on some of the comments, I think I was wrong to favor a cell death based explanation and think that an aberrant learning explanation is at least equally likely. I was especially convinced by the comparison to mal de debarquement (THAT WAS A REALLY FUN TIME READING THAT LINK WHILE I WAS ON A SHIP-BASED VACATION, LET ME TELL YOU), which seems similar but doesn’t naturally lend itself to a cell death angle. The aberrant learning idea raises more questions than it solves, but does seem to fit a variety of phenomena better.

2. New sidebar ad for Throne, a social media site for personalized chat rooms.