{"podcast":{"title":"TED-Ed","slug":"ted-ed-7859430","podcast_index_feed_id":7859430,"rss_url":"https://feeds.megaphone.fm/ted-ed","website_url":null,"image_url":"https://megaphone.imgix.net/podcasts/b7403760-4a33-11f1-9f4d-0b7f17190ea0/image/74cc63dc47cf18e2bcec0e2d83f0aaf9.jpg?ixlib=rails-4.3.1&max-w=3000&max-h=3000&fit=crop&auto=format,compress","author":"TED-Ed","episode_count":1210,"summary":"TED-Ed’s mission is to create lessons worth sharing. Feed and expand your curiosity with our award-winning animated shorts - published on YouTube and available with supplemental learning materials on ed.ted.com. Want to suggest an idea for a TED-Ed animation, nominate an educator or animator? Visit our website at: http://ed.ted.com/get_involved. Consider backing us on Patreon. By doing so, you directly support our nonprofit mission to create free, high-quality educational content: https://www.patreon.com/teded For more information on using TED-Ed content for commercial purposes (e.g. employee learning, in a film, or in an online course), please submit a Media Request using this link: https://media-requests.ted.com/","last_synced_at":"2026-07-25T10:18:01.246496+00:00","page_url":"https://stenobird.com/podcast/ted-ed-7859430"},"episode":{"title":"Who decides how long a second is? - John Kitching","slug":"who-decides-how-long-a-second-is-john-kitching","published_at":"2026-07-07T00:37:00+00:00","page_url":"https://stenobird.com/podcast/ted-ed-7859430/who-decides-how-long-a-second-is-john-kitching","show_page_url":"https://stenobird.com/podcast/ted-ed-7859430","url":"https://traffic.megaphone.fm/VG1024492575.mp3","audio_url":"https://traffic.megaphone.fm/VG1024492575.mp3","summary":"Discover how scientists developed atomic clocks, which use the vibrations of atoms to measure and maintain a globally consistent time. --In 1967, researchers gathered to answer a long-running scientific question: just how long is a second? It might seem obvious at first. A second is the tick of a clock, the swing of a pendulum, the time it takes to count to one. But how precise are those measurements? And what is that length based on? John Kitching digs into how we scientifically define this fundamental unit of time.Lesson by John Kitching, directed by Tjoff Koong.Support Our Non-Profit Mission----------------------------------------------Support us on Patreon: http://bit.ly/TEDEdPatreonCheck out our merch: http://bit.ly/TEDEDShop----------------------------------------------Connect With Us----------------------------------------------Sign up for our newsletter: http://bit.ly/TEDEdNewsletterFollow us on Facebook: http://bit.ly/TEDEdFacebookFind us on Twitter: http://bit.ly/TEDEdTwitterPeep us on Instagram: http://bit.ly/TEDEdInstagram----------------------------------------------Keep Learning----------------------------------------------View full lesson: https://ed.ted.com/lessons/who-decides-how-long-a-second-is-john-kitchingDig deeper with additional resources: https://ed.ted.com/lessons/who-decides-how-long-a-second-is-john-kitching#digdeeperAnimator's website: http://greenhouseanimation.com/directors/tjoff-koong/----------------------------------------------Thank you so much to our patrons for your support! Without you this video would not be possible! Po Foon Kwong, NinjaBoffin, Jesse Jurman, Josue Perez Miranda, Scott Markley, Elija Peterson, Ovidiu Mrd, Lawrence Wu, Xavier Dupont, Aravind Battaje, Nathan Giusti, Helen Lee, Anthony Benedict, Karthik Balsubramania…","meta_description":"Discover how scientists developed atomic clocks, which use the vibrations of atoms to measure and maintain a globally consistent time. --In 1967, research…","key_points":[],"chapters":[],"topics":[],"duration_seconds":511,"processing_state":"not_requested","actions":[{"name":"request_transcript","method":"POST","url":"https://stenobird.com/v1/public/podcasts/ted-ed-7859430/episodes/who-decides-how-long-a-second-is-john-kitching/transcription-requests","description":"Idempotently request low-priority transcript generation for this episode."},{"name":"read_markdown","method":"GET","url":"https://stenobird.com/podcast/ted-ed-7859430/who-decides-how-long-a-second-is-john-kitching.md","description":"Read the agent-friendly Markdown representation of this episode resource."}]}}