https://www.pbs.org/onlyateacher/timeline.html
https://online.merrimack.edu/importance-of-teachers/
http://www.nea.org/tools/take-your-class-outside.htm
http://www.nea.org/tools/18836.htm
https://www.nytimes.com/2010/03/07/magazine/07Teachers-t.html
https://udlguidelines.cast.org/
https://www.understood.org/en/articles/understanding-universal-design-for-learning
https://www.cde.ca.gov/be/st/ss/mathpractices.asp
https://www.insidemathematics.org/common-core-resources/mathematical-practice-standards
https://www.exploratorium.edu/education/teaching-resources
https://www.commonsense.org/education/top-picks/terrific-websites-for-science