What is identified as the subtle, unifying philosophical thread behind Einstein's major scientific breakthroughs?
Answer
Symmetry/Invariance—the idea that fundamental relationships remain unchanged despite apparent component changes
The text suggests that the most revolutionary aspect of Einstein's legacy is his insistence on finding the invariant core—the symmetries—in physical laws, whether it was the speed of light in SR or the invariance of physics laws under acceleration in GR.

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