Archive for August, 2009

The future of education (with an emphasis on science education)

August 4, 2009

I love where education is headed. This is a weird statement to make as a teacher; my income is currently based on the existence of relatively traditional schools. I could of course switch to tutoring, non-traditional educational institutions, become a consultant, or otherwise use my skills in related areas. But the truth is that I like working with high school students* and find the traditional setting perfectly acceptable. Yet I love the change that I see building up around me to invert some of what we now think of as schooling.

I recently mentioned Dan Meyer’s “Be less helpful” comment. It fits very well with the ideas of Modeling Physics (building from experiences and models of them with a big dose of Socratic Questioning), Peer Instruction, the recent explosion of the podcast (or vodcast) in education whether in chemistry or in general, and the flourishing of free online resources in the form of OpenCourseWareand textbooks (sorry for the physics centric link – follow links to go to the overall sites) or even whole Universities. Moving the basic transmission of ideas into a student centric space and focus the time in the institutional (social) setting for discussion, activities, and assessment (including more informal feedback style assessment similar to Eric Mazur’s Peer Instruction as well as formal tests). Its powerful stuff even if it isn’t really new. As I’m sure many people have noticed its really what a good literature class already does!

There are questions of course.

1. Can this inversion do anything about the smart under-achievers? Can such a switch motivate them to gain something from a podcast, video, or web site that they wouldn’t get a from a lecture, textbook, or teacher led activity?

2. Can this work in a setting with underprivileged students? The quantifiable data seems to say that this group isn’t doing much outside of class. If you combine that with the possible digital divide it might be rough. The flip side is that podcasts and audio are accessible with minimal and ubiquitous hardware. Plus playing them, or even a vodcast, might not seem quite a publicly nerdy as reading a book.

3. If perfect is the enemy of good and many teachers are at a good point right now is the benefit worth it? Purely thinking as a classroom teacher I find this the biggest question. It is not a matter of the amount of work but instead its a matter of having the transition from one style to the other disrupt the learning and lead to a result that is worse then either method. Or, to put things another way, is there enough buy in among all stakeholders that a teacher can safely learn these methods while doing them. Clearly this is a case by case basis.


LEAF Question

August 3, 2009

I posted about the LEAF yesterday. I love the idea of an electric car from a traditional manufacturer with reasonably normal looks, a non-sports car mission, and a useful combination of speed and range. While I’m sure that the LEAF can not go 100 miles at 90mph I think its reasonable to make the assumption that it can go fairly close to 100 miles given a blend of 35 – 65 mph speeds like many people would see in a commute. Of course there are chicken and egg problems concerning recharging stations but all new technologies have this.

However as I went to sleep I was wondering about the recharge rate. It seems awfully fast. The batteries hold 24kWhr of energy. 80% of that is roughly 19kWhr. Given half an hour of charging time and a 200V outlet (yes, its probably 220V but the math is easier this way) I’m getting a 190A average flow of charge. That’s doable but its fairly large – this is not your normal dryer circuit.

Nissan LEAF

August 2, 2009


nissan leaf electric car

90mph top speed (that’s actually much higher then I think it needs to be but I understand why it makes little sense to cap it at around 65mph) and 100 mile range make it very practical. Stated recharge to 80% of battery in 20 minutes (listed as 30 minutes on a different site) is even better. Nissan’s official website is here.