A link to the paper: <a href="https://www.pnas.org/doi/10.1073/pnas.2418616122" rel="nofollow">https://www.pnas.org/doi/10.1073/pnas.2418616122</a><p>This looks like it is a study supporting the Zearn Math platform (<a href="https://en.wikipedia.org/wiki/Zearn" rel="nofollow">https://en.wikipedia.org/wiki/Zearn</a>). Does anyone have any experience with them? I am only curious (not a teacher or student).