Why Quantum Entanglement Cannot Transmit Information Faster Than Light

In 1935, Albert Einstein, Boris Podolsky, and Nathan Rosen published a paper that would spark one of the most profound debates in the history of physics. They argued that quantum mechanics must be incomplete because it allowed for what Einstein would later famously call “spooky action at a distance”—the phenomenon now known as quantum entanglement. Nearly a century later, entanglement remains one of the most misunderstood concepts in physics, particularly regarding whether it can be exploited for faster-than-light communication. ...

9 min · 1885 words

How GPS Actually Works: From Atomic Clocks to Einstein's Relativity

On February 22, 1978, the first Navstar GPS satellite lifted off from Vandenberg Air Force Base. The engineers who built it had solved a problem that seemed impossible: determining a position anywhere on Earth to within meters, using signals from satellites orbiting 20,000 kilometers away. The solution required not just advances in electronics and rocketry, but a practical application of Einstein’s theory of relativity that affects every GPS receiver in existence today. ...

13 min · 2636 words