The entire global financial system depends on GPS, and it’s shockingly vulnerable to attack

There is an enormous, invisible clock that keeps ultra-precise time, can be checked from anywhere on earth, and is free for everyone to use. This technological gift to mankind was built by the US government. It is called the Global Positioning System (GPS), it lives in space, and you use it every time you check the map on your phone.

What you may not know is that you rely on it far more often than that. Cell towers use it to route your phone calls, ATMs and cash registers use it for your...

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