IntMath Newsletter: Open source textbooks, math of beauty
By Murray Bourne, 14 Jan 2014
14 Jan 2013
In this Newsletter:
- Resource: Open source textbooks
- Updated math interactive - Math of beauty
- IntMath Polls
- Math puzzle
- Friday math movie - Sand images drawing machines
- Final thought - School for the soul
Happy New Year, everyone! I hope 2014 is kind to you, and that you learn a lot.
I usually don't blog much during the end of year period, mostly because people are not very interested in math then! (How do I know? See Thanksgiving for less math where I show what happens to IntMath traffic each festive season.)
IntMath recently passed some milestones:
- There are now over 13,000 people subscribed to the IntMath Newsletter. Welcome to all of you, especially the newcomers!
- There are over 4,000 people following IntMath on Twitter. I used to think Twitter was a useless time sink, but now that I'm part of an educational community that shares lots of interesting and useful things, I've changed my mind.
I love hearing from readers and was delighted to receive this from Rachel in Ireland:
I have never met you in person, but you need to know how much help your IntMath Newsletters were to me whilst I was studying. I returned to college as a mature student so needed every bit of assistance I could get, and found that through your newsletter and site. Thank you so much."
You're very welcome, Rachel!
On with the Newsletter.
1. Resource: Open source textbooks
Here's a great alternative to expensive college texbooks:
Most of the books are released under a Creative Commons license and are provided by a consortium of colleges and organizations in the US, including AcademicPub, Carnegie Mellon University, Community College Consortium for Open Educational Resources, Flat World Knowledge, Macmillan's DynamicBooks, MathScore and MERLOT.
Apart from math, you'll find open textbooks on a broad range of topics including art, science, economics, nursing, and sociology.
And you can't beat the price!
However, note their disclaimer, which says:
Disclaimer: College Open Textbook has not yet vetted all of the open textbooks on this list for quality or accuracy of the content.
2. Updated math interactive - Math of beauty
This page has always been one of the most popular on IntMath. I updated it so it also works on tablets and (large?) smart phones.
This interactive allows you to place a mask over the photos of "beautiful" people, and see how close their face is to the "ideal". See:
Math of Beauty (you'll find the mask interactive about 1/2 way down the page)
Skin deep? On the page, I have a disclaimer that says "inner beauty is more important than external beauty.". As I said, this is not a serious piece of science!
3. IntMath Polls
Studies show one of the biggest impacts on student learning is the quality of the teaching. This poll is consistent with that finding.
The poll during Nov/Dec 2013 asked readers:
What would have the biggest positive impact on your enjoyment of school?
Learn more about real life issues
Total votes: 1200
Current IntMath Poll: Considering the above result, the current IntMath Poll asks what teachers should do to improve learning outcomes. You can answer on any (inner) page of IntMath.com.
4. Math puzzles
The puzzle in the last IntMath Newsletter asked about the least 2 positive integers with certain remainders.
The question I asked is actually very old. It was posed by the Chinese military general, strategist and philosopher Sun Tzu in the 1st century CE. (Yes, the guy who wrote Art of War.)
Correct answers with explanation were given by Nicos and Hamid.
New math puzzle
A 2000-page book has pages numbered consecutively from 1. What percentage of the pages contain a 5 in the page number?
Leave your responses here.
5. Friday math movie: Four Cable Drawing Machine
This reminds me of Spirograph images that brought art and geometry together, and always had an element of mystery to them.
Watch: Four Cable Drawing Machine
6. Final thought: School for the soul
"Think of life as a school for your soul; you are here to learn in perfect well being. Here's a tip for life's pop quizzes: instead of asking why something happened, ask instead 'what can I learn?' For extra credit, ask '...and how may I serve?'" [Jackson Kiddard]
Until next time, enjoy whatever you learn.
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