https://thenextweb.com/shareables/2020/03/26/half-life-alyx-math-teacher-vr/

Finally something good has come out of the coronavirus pandemic: Stuck in quarantine, one teacher has resorted to VR to drop knowledge to his students. Oh, and he did it in Half Life: Alyx.

Meet Mr. Charles Coomber, a San Diego-based teacher at Otay Ranch Academy for the Arts, whose latest lesson on angle vocabulary has gone viral on YouTube. The whole thing is recorded in Half Life: Alyx, with Mr. Coomber using virtual windows as a makeshift whiteboard. Pretty cool.