More evidence, from a large-scale study in China, that using AI hurts learning if it undermines mental effort. When homework time drops due to AI use, so do test scores. Across studies, a theme: AI tutoring in support of classes is good, using AI to "help" with homework is bad.

@emollick @karpathy rightly says that while learning, the primary feeling should be that of effort. He said it for YouTube content, but the point still stands. Taking shortcuts is suboptimal for learning.