Einstein's decade-long pursuit
Einstein took roughly 10 years of dogged pursuit from his 'happiest thought' in 1907 to writing down the final form of general relativity in 1915.
Snapshot · Dwarkesh Podcast
Adam Brown – A deep but accessible introduction to general relativity
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Jul 10, 2026
Where this was said
The coincidence that led Einstein to general relativity
At 1:08 · chapter starts 0:00
Brown opens his mini-lecture with Newton's second law (F = ma), his first law (zero force means straight-line motion), and then his gravitational force law: F = GMm/r². He flags the immediate problem — Newton's law implies that jiggling the Sun would instantaneously change the gravitational force felt at Earth, violating the finiteness of the speed of light. He draws a historical parallel to the electrostatic force law, which faced the same problem and was resolved by Maxwell's full theory of electromagnetism. That success story sets up the hope — and the difficulty — of doing something analogous for gravity.
Why You Can't Do the Same Trick for Gravity as for Electromagnetism
Electrostatics was upgraded into a relativistically consistent Maxwell theory, and you'd think you could do the same for gravity. But there's a sign flip: like charges repel, like masses attract. Do the same math and you get a theory where gravity repels. That forced Einstein down a completely different path.
Newton's Embarrassing Coincidence
In Newtonian physics it's just a coincidence that inertial mass and gravitational mass are identical. But we've tested it to 1 part in 10^15. Einstein refused to accept a coincidence that precise. That refusal became the core of general relativity.
Equivalence principle: 1 in 10^15
The equality of inertial mass and gravitational mass — Einstein's central clue for general relativity — has been confirmed experimentally to 1 part in 10^15.
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