[2:21:44 - 2:21:50] here, a GPS ground station with an atomic cesium clock and compare it to the atomic cesium clock,

[1:17:24 - 1:17:31] in Wi-Fi and Bluetooth, and you could see in FM and AM and GPS, your perception of reality would be

[1:20:52 - 1:20:58] way. But is that really the way time works? Well, we know time is relative because GPS satellites

[1:21:08 - 1:21:13] meaning depending how far the satellite was, the GPS satellite was from the surface of the earth,