A teacher member of the PTSOS** list posted:
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We're discussing Special Relativity in my conceptual physics class,
and a student asked WHY light goes at 300,000 km/s, and what limits it.
Have you any recommendations for a response?
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Does one answer such questions by: physics deals w/ how and what, not why (that's meta-physics), or delve into Maxwell -- which leads to why is mu 4Pi E-7 and e 8.85 etc.