Math Photo: Northern Irish Arch
April 13, 2011, 12:00 amI got the idea for this “Math Photo” series from Mr. Honner. I’ll post images of mathematical stuff from my archives from time to time. Why not?
Here is an arch that I found near Cushendall, Northern Ireland, on my honeymoon. Is it parabolic? Or some other kind of arch?
Möbius Transformations
April 6, 2011, 12:00 amFrom Boing boing and linked article:
Abstraction lies at the heart of mathematics. It makes math powerful, but at the same time, it can make math hard to understand. Abstraction makes math simultaneously beautiful and austere, useful and esoteric.
But a picture can tame the mad monster of...
Leaking Gasoline Puzzler
April 6, 2011, 12:00 amThe Last Gasp of the Fiat
“A car travels at a steady speed of 45 mph. Its fuel consumption is 30
miles to the gallon. It has a 15-gallon gas tank, which was full when the car started off. But at the very moment the car begins to move at 45 mph, the gas tank begins to leak fuel.“After 225 mi...
Khan Academy and SBG
March 30, 2011, 12:00 am@CmonMattTHINK put forth a comment on twitter a couple of mornings ago:
Salman Khan TED-talks about classroom inversion:
http://www.ted.com/talks/salman_khan_let_s_use_video_to_reinvent_education.html Very exciting, yes. But I must be the cranky old man and say..
SO much of this (and SBG) i...
Toilet Paper Tubes and the Empire State Building #wcydwt
March 29, 2011, 12:00 amSo I’m watching the idiot tube the other day and I saw a commercial by Scott Paper Company that claimed that if everyone in America used their tubeless toilet paper product, then we would save two Empire State buildings of toilet paper rolls every year.
Two Empire State buildings of toilet paper...
The Cosmonaut: An Economic Experiment
March 28, 2011, 12:00 amSo the guys who made the glif with much success, are now introducing another product on kickstarter.
The Cosmonaut. Its a wide-grip capacitive stylus for tablets.
The interesting thing is their pricing model. They are selling 3,000 of them, and they need to raise $50,000 to make that po...
Two Great Graphing Tools
March 24, 2011, 12:00 amHere’s a quick post describing two pretty great graphing extensions for google chrome:
And:
To install the extensions, you need to have a relatively new version of chrome. Next go to the webstore 
and search for the right extension.
Enjoy!
Why Teachers Like Me Support Unions.
March 22, 2011, 12:00 am
Why do I support teacher unions?
Because the quality of education is better. Yes it is. (note: I worked in a private boarding school for two years before moving to public schools). We want our students taught by teachers who focus on the students learning.
Without unions, teachers also have to...
No Homework Grade! No Way!
March 11, 2011, 12:00 amIn concert with the Standards Based Grading, I’ve also changed my homework policy. In the past I would check homework completion levels every day from every student. They would have a grade out of 4; 4 fully done, 2 half done or late, 0 not done.
