"Things we learned"
[0] http://www.usingenglish.com/forum/threads/5331-Ues-of-Learne...
See my comment.
learn, v.
Forms: Pa. tense and pple. learned /lɜːnd/ , learnt /lɜːnt/ .For instance "My knowledge of grammar is learnt". When you're using it as a verb (a doing word), it's "learned" i.e. "Today, I learned something".
Today you learned about "learned", hopefully that's your lesson "learnt".