I'm Dan and this is my blog. I'm a former high school math teacher and current head of teaching at Desmos. 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!