Pi (commonly shortened as 3.14159, or π) is the ratio of a circle's circumference to its diameter. Its value can be expressed as a mathematical series that produces an infinitely long number. As such, Pi is 'irrational', which means that the digits never end or repeat in any known way. This mysterious mathematical quirk has been recognised by humans for millennia, and the symbol has now become well represented in popular culture. The famed astrophysicist Carl Sagan's science fiction work…
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