einstein

Time moves slower near gravity because mass curves spacetime, and general relativity says clocks deeper in that curvature tick at a measurably slower rate.

How Einstein's special relativity predicts that a traveling twin ages slower, why this isn't actually a paradox, and the atomic clock flights that proved it real.

Einstein spent years designing thought experiments to break quantum mechanics. Bohr defeated every one. The Bohr-Einstein debates, from Solvay 1927 to the EPR paradox.

On May 29, 1919, two expeditions photographed a solar eclipse to test Einstein's general relativity. The results made Einstein a global celebrity — and sparked a controversy that took 90 years to resolve.

In October 1971, physicists flew atomic clocks around the world and proved time dilation is real — clocks gained and lost nanoseconds exactly as Einstein predicted.

In 1887, Michelson and Morley tried to measure Earth's motion through the ether and found nothing. That null result demolished a century of physics and paved the way for Einstein.

Hertz spotted it in 1887. Lenard mapped its rules. Einstein explained it in 1905. Millikan spent a decade trying to disprove Einstein — and ended up confirming him.

Gravity explained: Newton's universal law, Einstein's curved spacetime, gravitational waves, and why GPS satellites must correct for it.

Why one twin really does return younger after a near-light-speed trip, with the math, real experiments, and time-travel implications.

Einstein's special and general relativity explained simply: time dilation, E=mc², curved spacetime, gravitational waves, and tests that confirm them.

Your phone's navigation relies on corrections from both special and general relativity. Without Einstein, GPS would be off by kilometers within hours.

Time slows down, space bends, and mass becomes energy. Einstein's relativity is strange but beautifully logical.