Image cred.s:
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http://courseweb.hopkinsschools.org/course/view.php?id=1270
https://www.etsy.com/nz/listing/69535017/be-rational-get-real-funny-black-t-shirt
https://www.tes.com/lessons/JF047dHDorVKrw/math-funnies
http://www.fanpop.com/clubs/math/images/20787076/title/math-jokes-fanart
http://justinchristensen.weebly.com/math-jokes-and-quotes.html
https://s-media-cache-ak0.pinimg.com/originals/cf/3e/ec/cf3eec7650788c87c9c197ad38561135.jpg
http://learn-english-forum.org/discussion/2098/maths-jokes
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http://mentalfloss.com/article/31271/our-12-most-popular-math-science-t-shirts-plus-big-sale
https://www.pinterest.com/pin/372250725422603459/