I've felt for a while we have an adpocalypse coming - that social media orgs are overselling the ROI of ads on their platforms, and that with consumer spending tightening a lot of ad revenue will dry up.
This, and using the web has trained me to just not see ads. While I don’t run an ad blocker, ads have to be subliminally effective as I’m idling waiting for them to complete (usually looking for the skip button). Maybe the younger, marketing-relevant groups watch them, but they’re just the crap one puts up with to see what I want.
The ai fails in at least two ways, showing me all sorts of stuff that’s irrelevant and then spending days or weeks sending me ads for X after I bought X on line. LensCrafters is particularly good at the latter.
At about the 20 minute mark, they show the Foucault testing of the mirror, and actually put a camera at the test focus, so you can see a Foucaugram of the mirror. It's of poor quality, but still. You see the donut. To anyone who was into amateur telescope making, ground their own mirror, used the Foucault test, and was as interested in mirror metrology tests as I used to be, this is absolutely fascinating.
My guess was a tainted thickening agent, I doubt it was put in maliciously, there was no top hatted man twirling his mustache cackling "haha now we will put anti freeze into our cough syrup and kill the children with it" but more criminal indifference as the batch of glycerin that they got for a really cheap went through a non-existant quality control process that would have found it tainted with the ethylene glycol produced at the same chemical factory.
