nostr:npub1jaqprqllqle54zgun29ugzmd0xn39hkq0pmnjt9qhupv0f60q47slllf6k 

(Also I don't know if all teens are developmentally ready to learn calculus... especially if they aren't naturally "in to" math. By the time a person is in their early 20s they probably have the executive function skills to manage the subject ... but it's unreasonable to think every teen will be ready and silly. )