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. You could just do an extension of your other lesson and survey the students by asking them how many testicles they have. ;-)

  2. Hmm… not crazy about this representation. It seems like it’s ripe for misinterpretation. It’s certainly interesting, and raises questions about why this seems to be a regional thing (or perhaps an age thing.)

    But the automatic assumption (that it shows where your “chances” are better) isn’t true. Just reporting numbers of more men or more women does not reflect the actual chance of running into one more than another. Take LA for instance. Those extra 89,000 men are scattered among 5 million people. In Honolulu, with a population of 800,000, those 15,000 extra men are MUCH more significant.

    Off to Anchorage!

  3. Morty McNutt

    April 3, 2008 - 8:42 am -

    Moved to Philly in 1999. Met my current wife in 2004. You are telling me Philly has more women than men? Hmmm…So what youse saying is I (statisticly speaking), am pretty pathetic?

  4. @Sylvia, yeah, I mean population density and looks are a consideration. Not even Philly’s gonna save me from my hunchback.

    @Tony, you want me fired for sure.

  5. In the vein of questioning where we live. The closest dot to me is about 6 hours away. Somehow I doubt it’s that we’re in perfect balance.

    Really, I just need to spend more time at the local cowboy bar.

  6. This is totally unrelated and I just found it so I haven’t had time to think a lot about it…but it sure seems like he’s on to something about how to set up a task in such a way that kids succeed at it, want to do it, see success quickly and often, AND that doesn’t take all day or even every day. It reminds me of your assessments, in that I’m betting that kids would be *asking* to do this.

    That and I’m wondering once I’m certified and have a job if I can convince them to put a pull-up bar in my elementary classroom!


  7. Very interesting post. Demographic studies are always fascinating.

    Also racial studies can be done with a huge success, for sure.

    But in Brazil this kind of study would touch a hard taboo, and as Miss Profe said: “too many are afraid of what it reveals”.

  8. Use grade level. Then you create a map showing where certain grade levels tend to hang out. I’d use the lunch break to have a consistent time frame. Where grade levels hang out will vary by time of day so you want to keep that constant.

    So which demographics did you use?