Appendix
Anonymous. (n.d.). Math may not teach us... Retrieved from http://www.searchquotes.com/quotation/Mathematics_may_not_teach_us_how_to_add_love_or_how_to_minus_hate._But_it_gives_us_every_reason_to_h/318285/
Loreti , A. (n.d.). Math coasters. Retrieved from http://www.etsy.com/listing/17077598/blackboard-coasters
Loreti , A. (n.d.). Math coasters. Retrieved from http://www.etsy.com/listing/17077598/blackboard-coasters