The National Physical Laboratory has made the world’s smallest Christmas card using ion beams. It’s about 200 million times smaller than a stamp, and you could fit 7 quadrillion in a post box. | Historyinmemes
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Why time in space is critical to life on Earth
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How the BBC's six pips time signal helped synchronise time 🕰️ In February 1924, a clock based at the Royal Observatory, Greenwich, London was used to send time signals to the BBC, who then broadcast this as the six pips time signal, where the last five seconds of each hour are denoted by a beep or a tone on the radio, with an extended tone on the very last one on the hour itself. Tap link to learn more: https://www.newscientist.com/video/2478756-the-clocks-that-helped-define-time-from-londons-r
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How optical clocks are redefining time and physics
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Do you have a moment to talk about what time is and why we measure it? Learn more at https://www.nist.gov/topics/time-frequency. | National Institute of Standards and Technology (NIST)
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Here's how atomic clocks harness the power of quantum physics to keep incredibly accurate time. | NOVA l PBS
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How optical clocks are redefining time and physics ⏰️⌛️ Atomic clocks record time using microwaves to measure the frequency of quantum vibrations of electrons. They are the basis upon which a second is defined. But there’s a new kid on the block, the optical clock, which boasts an even higher level of accuracy. Is it time to redefine the second? Tap link to learn more: https://www.newscientist.com/article/mg26635372-500-the-epic-quest-to-redefine-the-second-using-the-worlds-best-clocks/ | New Sc
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'Now' doesn't exist in a quantum sense. Neither does 'then'. So to …
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