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Subject: xkcd #2322: ISO Paper Size Golden Spiral
From: xkcd comic <>
To: OwlMan <>
Date: Friday, 19 June 2020 19:12
Size: 44.8 KB

ISO Paper Size Golden Spiral

The ISO 216 standard ratio is cos(45°), but American letter paper is 8.5x11 because it uses radians, and 11/8.5 = pi/4.

My new book, How To: Absurd Scientific Advice for Common Real-World Problems, is available now! Chapters include How to Move, How to Ski, How to Build a Lava Moat, and How to Make an Emergency Landing (that last chapter features advice from astronaut and test pilot Chris Hadfield.) Buy it here: Amazon, Barnes & Noble (Exclusive Edition), IndieBound, Target, or Apple Books.
Für meine deutschen Leser: Die deutsche Ausgabe How to – Wie man’s hinkriegt. Absurde, wirklich wissenschaftliche Empfehlungen für alle Lebenslagen erscheint am selben Tag. Ihr könnt sie bei Random Hause bestellen!

Congratulations to the How To book tour challenge winner, Juneau, Alaska!
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