How does a clock in your phone stay in sync everywhere?
The Invisible Heartbeat
How does a clock in your phone stay in sync everywhere?
Your phone knows it's 3:47 PM. Your friend's phone, three cities away, also says 3:47 PM. How do they agree down to the second when they've never met?
Inside your phone lives a tiny crystal that vibrates. It shivers back and forth exactly 32,768 times every second, like the world's tiniest tuning fork. Your phone counts those shivers to measure time.
