Your phone's GPS works because of Albert Einstein. Without his theories of relativity, your location would be off by miles within a single day.
In this video, we break down how GPS satellites use atomic clocks, why timing has to be incredibly precise, and how special and general relativity combine to throw those clocks off by 38 microseconds every day. We also look at the simple but brilliant fix engineers use to keep the system accurate.
A short journey through one of the most surprising places modern physics shows up in everyday life.
