Special Relativity
Albert Einstein · 1905
"Space and time aren't fixed backdrops — they stretch and compress depending on how fast you're moving relative to what you're measuring."
A 26-year-old patent clerk rewrote physics in 1905 without a lab or a university post — showing space and time bend depending on your speed relative to what you're observing.
Einstein's postulates were simple: physics laws are the same in every inertial frame, and light's speed is constant regardless of the observer's motion. Time dilation, length contraction, and E=mc² all fall out as consequences of that one idea, not as separate discoveries. Two events simultaneous to one observer can look sequential to another moving relative to them — neither observer is wrong.
What was the key insight that let Einstein derive time dilation and length contraction from just two postulates?
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The explanation above is written with AI assistance. These are the originals — go to them to check it.
- On the Electrodynamics of Moving Bodies (1905, English translation)Annalen der Physik (English translation via fourmilab.ch)
The Uncertainty Principle
"There is a fundamental limit to how precisely you can simultaneously know a particle's position and momentum — not because of instrument error, but because of the underlying nature of reality at the quantum scale."