This Day in Geek History: June 18

Today, June 18, is Phi Day! Like Pi, Phi, also known as the Golden Ration, is an irrational number, equal to approximately 1.61803398874989484820458683436564. Phi is used a great deal in astronomy, but it’s found everywhere you look here on Earth, from architecture to shells and even the human body. Most importantly, it’s found in the proportions in the Greeks’ famous golden rectangle, and it’s derivable by many proofs, including the famous Fibonacci Sequence.
1858
Charles Darwin receives an academic paper from Alfred Russel Wallace that draws conclusions regarding evolution nearly identical to those Darwin made himself. The concurring opinion prompts Darwin to publish his own theory of evolution.
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