The Textbook Challenge [CONTEST]
I have been known to say that there’s not much in your children’s textbooks that isn’t available in at least a dozen places online for free.
But, hey, maybe I’m wrong. After all, the textbook publishers think that they’re adding value to the teaching-learning process. And many teachers and school systems appreciate that someone else has curated for them the nearly-infinite range of learning resources that now exist in print and/or digital form.
This week I’ll be looking at my children’s textbooks and comparing them to what I can find online. I invite you to do the same. Let us know what you find and/or think by commenting on this post or any subsequent post in the series. Anyone that leaves a comment (along with a valid e-mail address) will be entered into a drawing to win the following prize pack:
The prizes aren’t really the point, of course. What’s important here is how able (or unable) we are right now to step away from costly printed/electronic textbooks. I agree with Michael Doyle’s statement that
a well-crafted web site with a thoughtful teacher acting as the curator to the links can produce a body of knowledge superior to textbooks.
I also would add that students should be part of the curation process too through use of tools like wikis, social bookmarking, and blogs. Subject-area associations like the National Council of Teachers of English or the National Council for the Social Studies, foundations, museums, libraries, and other entities also could be excellent curators of online content.
So… this week I investigate in more depth my own proposition. I hope you will join me by trying this yourself and also passing this quest along to others. Feel free to use my Textbook Challenge image as desired; like everything else I do, it’s got a Creative Commons license. Thanks!
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It's one of the most consistent patterns in the unviverse. What causes it?
- Spinning discs are everywhere – just look at our solar system, the rings of Saturn, and all the spiral galaxies in the universe.
- Spinning discs are the result of two things: The force of gravity and a phenomenon in physics called the conservation of angular momentum.
- Gravity brings matter together; the closer the matter gets, the more it accelerates – much like an ice skater who spins faster and faster the closer their arms get to their body. Then, this spinning cloud collapses due to up and down and diagonal collisions that cancel each other out until the only motion they have in common is the spin – and voila: A flat disc.
It turns out, that tattoo ink can travel throughout your body and settle in lymph nodes.
In the slightly macabre experiment to find out where tattoo ink travels to in the body, French and German researchers recently used synchrotron X-ray fluorescence in four "inked" human cadavers — as well as one without. The results of their 2017 study? Some of the tattoo ink apparently settled in lymph nodes.
Image from the study.
As the authors explain in the study — they hail from Ludwig Maximilian University of Munich, the European Synchrotron Radiation Facility, and the German Federal Institute for Risk Assessment — it would have been unethical to test this on live animals since those creatures would not be able to give permission to be tattooed.
Because of the prevalence of tattoos these days, the researchers wanted to find out if the ink could be harmful in some way.
"The increasing prevalence of tattoos provoked safety concerns with respect to particle distribution and effects inside the human body," they write.
It works like this: Since lymph nodes filter lymph, which is the fluid that carries white blood cells throughout the body in an effort to fight infections that are encountered, that is where some of the ink particles collect.
Image by authors of the study.
Titanium dioxide appears to be the thing that travels. It's a white tattoo ink pigment that's mixed with other colors all the time to control shades.
The study's authors will keep working on this in the meantime.
“In future experiments we will also look into the pigment and heavy metal burden of other, more distant internal organs and tissues in order to track any possible bio-distribution of tattoo ink ingredients throughout the body. The outcome of these investigations not only will be helpful in the assessment of the health risks associated with tattooing but also in the judgment of other exposures such as, e.g., the entrance of TiO2 nanoparticles present in cosmetics at the site of damaged skin."
Do you have a magnetic compass in your head?
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