A directory of useful objects found on the web for teaching Maths.
https://www.youtube.com/watch?v=sbGjr_awePE
http://ed.ted.com/lessons/making-sense-of-irrational-numbers-ganesh-pai (Alternate link)
Publisher, TEDEd, Video, YouTube
Explains Hippasus' proof by contradiction that there exist numbers with are irrational.
26 May 2016 Edit: 16 May 2018
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