Related to the number PI I can recommend the book I am currently reading, the story of PHI aka Golden Ratio:
https://books.google.com/books/about/The_Golden_Ratio.html?id=bUARfgWRH14C
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Related to the number PI I can recommend the book I am currently reading, the story of PHI aka Golden Ratio:
https://books.google.com/books/about/The_Golden_Ratio.html?id=bUARfgWRH14C
Ah great
THX :)