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. Does anyone else ever see a stranger who’s your same age, but think to yourself “gosh, I sure don’t look that old!”

    Or maybe that’s just me….?

  2. I don’t know why that’s so awesome, but it just is. It strikes me that my own son, who’s just 4.5, would like it, too. 100 is a very big number when you’re little.

  3. I’m not exactly sure what’s going on here. There is something inherently metaphorical about beating a drum, I think. Nor am I sure what happens in the viewer when his or her age flashes suddenly on the screen and then disappears.

    I only know that all of us decided we’d rather not live past 40. Unless we could be that awesome 99-yo guy.