I started asking "What did you work on today?" instead of asking about learning. I've realized that his IS often learning something, but the way he learns is basically via osmosis, so he has no recollection of when it happened, he just knows that he knows it now. This also helps me keep track of what they are working on in class, and sometimes helps trigger his memory on what homework/projects he's meant to be doing.
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Ditto to all of this! I also ask very specific questions about each class/subject. FWIW 2 out of 3 of my kids never really have liked to tell me about what they did during the day - its not because they had bad days etc, but mostly because the *timing* of when I ask - I tuicalloy ask right after school when I pick them up. That also just happens to be the time of day they are tired and hungry and they've just lived through the day, and as kids, in slight of being really smart kids.... I'm not sure they really grasped either that I didn't already know 100% of what their day had included and they for sure didn't understand why I care lol. So I do remind them from time to time why I care

and how it helps me help me to talk about it.
Best wishes,
polarbear