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" ... And yet, if you took an atomic clock — whether based on cesium, mercury, aluminum, or any other element — and moved it to a different elevation, that clock would run at a different rate from its original elevation: faster at higher elevations (in a weaker gravitational field), slower at lower elevations (in stronger gravitational fields). ... "
" ... Scientists Soeren Doerscher (l) and Christian Lisdat sitting in front of an optical clock in a ... [+] laboratory of the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany, 30 July 2016. PTB scientists have shown that optical clocks are suitable to be involved in the realization of the global time scale. One day could optical clocks replace cesium atomic clocks. Photo: JULIAN STRATENSCHULTE/dpa | usage worldwide (Photo by Julian Stratenschulte/picture alliance via Getty Images) ... "
" ... These effects of choices driven by ancillary technology can carry on for a really long time, though, following a phenomenon out of the basic research lab and into practical applications. The fifty-odd years of cesium clocks are one example, and medical technology is another. ... "