Wear an Atomic Clock on Your Wrist
The NIST miniature atomic clock is accurate to within a second every 300 years -- not as impressive as its industrial-strength brethren, but hey... in 300 years, you'll probably want a new watch anyhow. It works through a tiny bit of cesium vapor trapped in silicon; the clock measures the oscillation of the cesium atoms to count off time.
You might not need a watch that's that precise, but one immediate application is in GPS systems, where time accuracy and synchronization are critical.
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