art-shannonigans: iwasjustkidding: iridescentcatharsis: macmuffinpro: picnicinparadise: HOW DID I NOT KNOW THIS?! Why do I learn more about math from Tumblr than my 12+ years of formal education???????? No math teacher ever taught me this trick.
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original: https://www.tumblr.com/blog/view/zaidimas/53179255027