<ul data-eligibleForWebStory="false"><li>Daniel Kleppner, an experimental physicist known for his work in developing an atomic clock essential for GPS, passed away at the age of 92 in California.</li><li>During the mid-1950s, Kleppner learned about building precise clocks capable of detecting gravity's effects on time, leading him to work with renowned physicist Norman Ramsey at Harvard University.</li><li>Dr. Ramsey's research on measuring atomic frequencies laid the foundation for nuclear magnetic resonance and modern MRI technology, enabling the development of atomic clocks that keep incredibly precise time.</li><li>Kleppner's contributions to physics and his role in the development of atomic clocks have had a lasting impact, especially in the field of global positioning systems.</li></ul>

Daniel Kleppner, Physicist Who Brought Precision to GPS, Dies at 92

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