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2min chapter
AMA | October 2022
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
Quantum Electrodynamics - Is the QCD Scale a Dimensionless Number?
The strong interactions also have a dimensionless number associated with them, but it's harder to tell you what that number is. The fine structure constant of electromagnetism is the most obviously dimensionless of any of the fundamental structure constants. I don't think that it means that it has any fundamental role in quantum gravity or anything like that.
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