What do you guys do with your books from college/university?

I got stacks of math, physics and statistics books that I'll probably never read again.

But still, I dished out probably thousads of dollars (overpriced as hell) these books, and worked my ass off studying them...

And maybe there is some sentimental or identity value to them aswell..?

It's like there is a connection to the past and the knowledge as long as I keep the books.

Like, I can go look up stuff and "refresh", though realistically I've probably forgot most of it.

But if I throw the books away... then it's like its gone for good?

Idk, can anyone relate?