3 facts
In quantum entanglement, two particles become linked in such a way that the state of one instantly influences the state of the other, no matter how far apart they are. Einstein famously called this "spooky action at a distance," highlighting its counterintuitive nature in quantum mechanics.
Due to special relativity, astronauts on the International Space Station move at high speeds, causing time to slow down for them compared to people on Earth. They return to Earth a tiny fraction of a second younger than they would have been, a real-world demonstration of Einstein's theory.
According to Einstein's theory of general relativity, gravity causes time to slow down. Since there's slightly less gravitational pull at higher altitudes, time literally ticks faster compared to sea level, a measurable effect of spacetime curvature.