This artful illustration of Einstein, some of his equations, and a rendering of a surreal clock helps us conceptualize the differing passage of time experienced by people in different locations and moving at different rates. Although time dilation had been measured for subatomic particles previously, it wasn’t until ~50 years ago that it was measured for an actual clock. (Credit: pasja1000/pixabay)

Einstein was right. Flying clocks around the world in opposite directions proved it.

Time isn’t the same for everyone, even on Earth. Flying around the world gave Einstein the ultimate test. No one is immune from relativity.

In 1905, our conception of how the Universe changed forever when Einstein put forth his…