Policies will be updated on this page as needed.


This material is governed by the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).

Note to Educators: Some institutions have policies against the reproduction of class notes that may interfere with your ability to use material from this site, due to the share-alike clause of the license.

For all other uses and edge cases, permission may be sought by contacting: info@matterblog.net

Nofollow Tag:

Due to the nature of issues often covered by Matter, links to external content may be modified with the HTML attribute:


This is an indicator to search engines that linking to the site should not influence the search rankings of the website in any way. This is to prevent the proliferation of bad information, fake news, and pseudoscientific articles across the internet. This policy is posted publicly in an effort to make others aware that linking to external websites without the tag may inadvertently enhance the popularity of those websites, and to offer a strategy to counter this.


I spell it “aluminum,” not “aluminium.”