Umm... actually recalling information is INT.

The first line under "intelligence" in the PHB is:

"An Intelligence check comes into play when you need to draw on logic, education, memory, or deductive reasoning."

Hell, even the keen mind feat, which gives you perfect memory for a month, gives you INT.

Uhm, actually recalling and learning from personal experience is WIS and not INT.

Where is that from?

I don't want to remember.

That's what I do with my gnome wizard... after all, the PHB explicitly says "gnomes love puns"

Nine.

There is!

Under the Konsi comics, you should see her name as a link, if you click on it, it'll show you only those.

They're in reverse chronological order, so start at the bottom and work backwards. Please be advised that there's some non-comic art of her mixed in.

Sir, this is a meme

These items set your stat to 19 if your stat was lower than 19.

Faelys' INT is 20, and Konsi's WIS is 20. The only real use of such an item in our party would be to provide a large boost to a dump-stat, and if you're doing that, you might as well go for the biggest boost possible.

In reality, we wouldn't make regular use of such an item, everyone in the party is rocking three attuned items that they'd prefer to a headband of intellect when adventuring. It's the kind of thing we'd put in the bag of holding and then attune during a downtime day when we needed to do library research.