I'm Dan and this is my blog. I'm a former high school math teacher and current head of teaching at Desmos. He / him. More here.


  1. Ehm…. if it would have been Windows only, all Mac users would have been very mad, but now “we can just download it for free”?

    I love your posts, I love your ideas, Dan. I even showed your TED Talk to a collegue in my university and within 48 hours a whole bunch of students in the BEd program were watching it (in the Netherlands, they were Dutch teachers in training). But you got to think more open. WordPress: check. Sharing ideas: check. Sharing materials: check. Vendor lockin: pity. Just a darn shame…. makes your ideas less accessable. And they are so worth being seen by everybody!