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special relativity
Massless Particles: Why They Must Travel at Light Speed
Massless particles have zero invariant mass and must travel at the speed of light in vacuum. The photon is the only confirmed example.
Andromeda Paradox: When "Now" Depends on Who Is Walking
The Andromeda Paradox is a thought experiment showing that two observers moving at different velocities disagree about what is happening "now" at distant...
The Andromeda Paradox Shows That "Now" Is a Local Illusion
Is the future already written? Physicist Sabine Hossenfelder tackles the mind-bending Andromeda Paradox that challenges our understanding of time.
How Magnets Work: Four Quantum Requirements
The Stern-Gerlach experiment proved electrons are tiny magnets. But permanent magnets need four quantum phenomena: electron spin, half-filled energy levels, ferromagnetic crystals, and...
