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PI is what
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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
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This is a science community. We use the Dawkins definition of meme.
The only thing I can think of is that they wanted the math to be easy, and somehow thought 3 was easier than 5. But, that's hard to believe because the only other numbers used were all 10s, so it's 3*10*10*10 vs. 5*10*10*10.