What the train thought experiment in special relativity shows — simultaneity is relative to the observer's motion

What the Copenhagen interpretation says — the wavefunction collapse is fundamental, observation creates reality

Copenhagen interpretation: Observing a system collapses its wavefunction, shaping reality

Why special relativity doesn't need the luminiferous aether — the Michelson-Morley null result becomes expected

Special relativity's framework negates aether's need, as light's speed is invariant, aligning with Michelson-Morley's findings

Why GPS satellites must correct for both special and general relativistic effects — or positions drift by 10 km/day

GPS satellites account for relativistic effects to ensure precise positioning, averting a daily drift of approximately 10 km

What the equivalence principle says — being in a gravitational field is locally indistinguishable from acceleration

Equivalence Principle: Gravity mimics acceleration, indistinguishable locally

What Maxwell's demon thought experiment challenges — can information be used to decrease entropy

Maxwell's demon challenges the second law of thermodynamics by potentially decreasing entropy using information

What gravitational time dilation means — clocks run slower in stronger gravitational fields

"Gravitational time dilation: stronger gravity slows clocks relative to weaker gravity."