Episode Summary
Executive Summary: Radiolab explores how time is not fixed but plastic, local, political, and experiential. Through music stretched to a day, historical timekeeping, relativity, neurological disorders, elite athletics, and meditation, the episode shows how changing pace reveals hidden structures in sound, society, and consciousness.
Main Topics: Time as a plastic, experiential phenomenon: The episode opens by arguing that time can feel swollen, compressed, slow, or fast depending on memory, attention, emotion, and context, using Beethoven stretched into a 24-hour piece as its central metaphor. From local time to standardized clock time: A historical explanation of how railroads forced towns to synchronize clocks, replacing task-based and local solar time with standardized time zones and railroad schedules. Technology that freezes motion and reveals secrets: Photography and film are shown as tools that stop or dissect movement, from Oliver Sacks’s fern time-lapse experiments to Muybridge’s horse studies and film’s role in factory efficiency. Relativity and the non-universality of time: Brian Greene explains Einstein’s view that time is observer-dependent: moving objects experience time differently, challenging everyday assumptions of a single universal second. Neurological disorders and radically different tempos: Oliver Sacks describes Parkinsonian patients whose actions and speech unfold at vastly different perceived speeds, showing that human subjective time can diverge dramatically from shared time. Athletic performance and mastery of time: Track athletes describe entering flow states where time seems to slow, suggesting that speed, focus, and adrenaline can alter lived experience and become a source of power. Time as political and cultural power: Jay Griffith argues that empires, rulers, and protest movements use calendars and clocks to assert authority, while many cultures root time in nature rather than mechanical systems.
Key Arguments: Time is not a single universal constant in lived experience; it changes with memory, motion, emotion, and neurological state. Standardized clock time emerged historically from economic and infrastructural needs, especially railroads, not from nature. Scientific tools like photography and film do not just record time; they transform understanding by making motion visible in discrete frames. Einstein’s relativity means clocks in motion can literally tick at different rates, so time depends on the observer. Neurological conditions can stretch or compress human action and speech so radically that a person may experience hours as seconds or vice versa. Athletes experience time differently in peak performance, often describing the world as slowing down during intense focus. Timekeeping has been used as a form of political control, but many societies track time through birds, flowers, smells, and seasons instead of clocks.
Data Points: Beethoven's Ninth Symphony original duration: 60-some odd minutes / about 70 minutes - The piece is described as Beethoven’s original symphony length before digital stretching. Beethoven's Ninth Symphony stretched duration: 24 hours - Used as the program’s opening and closing example of time compression/expansion. Oliver Sacks's memory recital of years: 1972 to 1987 - He recited years aloud while driving, showing how some memories felt expanded and others compressed. Time lapse interval for fern photos: Every hour or so - Sacks photographed fern growth at hourly intervals to compress unfolding time. Tony Schwartz's audio flipbook length: 2 minutes, 12 seconds - “Nancy Grows Up” condenses a child’s development into a short audio montage. Sandusky railroad time offset: 20 minutes later - Local noon was shifted to match railroad schedules. Muybridge camera count: 24 cameras - He used a row of cameras to freeze a horse’s gallop in sequential images. Muybridge exposure speed: 500ths of a second - Photography was pushed to capture motion fast enough to analyze a galloping horse. Oliver Sacks's patient photo set: About 20 photographs over two hours - Used to show a Parkinsonian patient’s two-hour nose-wiping movement. Hester's reaction time: A tenth of a second or less - Sacks contrasted her rapid response with average athletic reaction times. Elite athlete reaction times: About a seventh of a second - Referenced as top Olympic-level reaction times. Track athlete race duration: About 10 seconds or 9 seconds - Sprint athlete describes the compressed time window before a race.
Pivotal Quotes: "Time is a very plastic thing. It's swollen and rich some of the time, and then it's like flaccid and eh other times." — Oliver Sacks: Sacks explains how subjective time varies with memory and experience. "When I see the second hand in your clock going around, it's changing position. And that's the simplest version of a change corresponding to time elapsing." — Brian Greene: Defines time through observable change in the relativity discussion. "Time is a highly political subject." — Jay Griffith: Griffith frames calendars and clocks as instruments of power and identity.
Implications: Listeners are invited to question clock-based assumptions and notice how science, culture, politics, and embodiment shape time. The episode suggests that time can be measured, manipulated, and felt in radically different ways across contexts.
From the Episode
Yes, we're used to clocks which you can see when it's really dark and it's, you know, you can see that you've just woken up at 2.35 and you really didn't want to wake up at 2.35. But of course for a long time, you know, in the night, you don't have a way of seeing what the time is. And so somebody invented a spice clock so you could taste your way through the night. So there would be maybe kind of, you know, cinnamon for about one o'clock and turmeric for two o'clock. So you're sitting there in bed and you sniff the time. Well you could taste it. Right, how about the clock of birds? This is the Kaluli people. Oh yes, now this is lovely. The Kaluli people of Papua New Guinea they have what they call a clock of birds, um and that certain birds like the um New Guinea friar bird and the hooded butcher bird, when they sing in the mornings the children are taught to understand that that's a signal to get up and leave and you know, get out of the house.
Road protests in the mid-90s. The British anti-road protests? Yes, they were environmentalists. They don't like roads? Yes, environmentalists who were protesting against the building of roads. And one of the things that they chose to do was to write this self-governing manifesto pointing out that for them they were not going to recognize Greenwich meantime. Time is a highly political subject. It initially was the British sense of time which was transported all over the world. Britons ruled their empire through ruling the oceans. They ruled the oceans because they discovered chronometers of sufficient accuracy to discover longitude. What the British did in their empires was to insist on GMT, Greenwich Mean Time, and you know that other countries were sort of Greenwich Mean Time retarded a bit or advanced a bit, but essentially The real time as in London. It's the real time in London. That's true, of course, as the British don't own the seas anymore, but we all still use Greenwich Mean Time. Absolutely, absolutely. We're very used to thinking that empires are to do with land. What I'm arguing is that actually there have been empires of time.
About Radiolab
Radiolab is on a curiosity bender. We ask deep questions and use investigative journalism to get the answers. A given episode might whirl you through science, legal history, and into the home of someone halfway across the world. The show is known for innovative sound design, smashing information into music. It is hosted by Lulu Miller and Latif Nasser.