The one horse fact I know is that violin bows (and presumably all viol* and string bass bows) use tail hair from male horses, never female, to avoid using pee-drenched hairs.
My family isn't medical, just lazy. If you never bring your shoes inside or your outside pants into the bed, then you don't have to vacuum/mop or wash bedsheets respectively as often.
I don't think that makes you a germaphobe, just normal. Especially after a pandemic. Here's one more: phones are pretty nasty if you don't wipe them down.
I was really lonely and scrolling up really old posts in this community to talk in, and maybe others sort their feeds by recent comments meaning my activity pushed it up. Or maybe I just like ascribing more responsibility to myself :P
Edit: I sort by recent comments, so this post showed up in my feed. I don't know why the others started commenting on it 10 hours ago though.
Like skele_tron said, I find it useful for finding images similar to existing boards/images. It's like Instagram's explore page, but you can look at an explore page specific to one board or one post. I haven't been on Instagram in a while, but I think the saved posts feature didn't have the ability to suggest (visually) similar posts there.
You can also save images in Pinterest, which I couldn't do in Instagram. I draw sometimes, so it's really nice to be able to download a picture and zoom in on it and have it stay that way.
On Instagram, if you like a post (subject matter, art style, mood) you just have to hope the same creator posts something similar. On Pinterest, you can scroll down below a post and it automatically gives you visually similar pretty images, by anyone.
Math education, probably. I don't have any numbers, but there are probably far more people taking calculus in high school than there used to be, and a lot of them are probably taking it earlier than senior year. At least that was my experience compared with my parents'.
Also, this is unrelated, but it's strange that this post has (at the moment) 20 comments but only 5 votes.
I believe there do exist places where you can get a virtual library card without living there. New York Public Library is what comes to mind, but don't quote me on that.
I think it's app-specific. I use Voyager and the most recent version has ability to block keywords.