A directory of useful objects found on the web for teaching Maths.
https://www.youtube.com/watch?v=443B6f_4n6k
http://interestingengineering.com/old-calculator-nearly-explodes-divides-zero/ (Alternate link)
Interesting, Video, YouTube
An old mechnical calculator attempts to divide by zero.
8 April 2016 Edit: 5 April 2016
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