Physics
Relativity
A theory built almost entirely from thought experiments in a patent office — later confirmed true down to fractions of a second.
Quantum Mechanics
The rules of the universe change once you zoom in far enough — and even the physicists who discovered this found it deeply unsettling.
Nuclear Energy
A power source capable of generating enormous amounts of electricity with zero direct greenhouse gas emissions — while also carrying a small number of accidents serious enough to shape global energy policy for decades.
Thermodynamics
Four simple laws that explain why your coffee always goes cold, and never once has it spontaneously reheated itself back to piping hot.