Learn Something

Lifelong Learning University

Welcome to "Learn Something" — the podcast that feeds your curiosity one episode at a time. Whether it’s unraveling the mysteries of space, diving into the roots of world religions, exploring economic concepts, or decoding the latest in technology, each episode brings you a fresh, bite-sized journey into a fascinating topic. No fluff, no jargon — just engaging, accessible knowledge across a wide range of subjects. Tune in, expand your horizons, and learn something new every time you listen.

  1. -8 H

    The Science of Sleep: Beyond Eight Hours

    Most of us have heard we need eight hours of sleep, but that number only tells part of the story. What actually happens inside your body and brain during those hours turns out to be a lot more intricate than a simple timer running down. Sleep is not one continuous state - it is a series of repeating cycles, each lasting about 90 to 120 minutes, made up of distinct stages. Early in the night, your body spends more time in deep slow-wave sleep, which is when physical repair happens, growth hormone is released, and your immune system does some of its most important work. Later cycles shift toward REM sleep, where your brain is nearly as active as when you are awake. That is when memories get consolidated, emotions get processed, and the learning from the day before gets locked in. Skipping or cutting short any one of those stages has real consequences. Poor slow-wave sleep can leave you exhausted even after seven or eight hours in bed. Not enough REM sleep tends to show up as mood problems and trouble concentrating. This episode walks through what each stage is doing, why the timing across the night matters, and what researchers have learned about how sleep affects metabolism and immune function specifically. There is also a genetics angle that has gotten more attention recently. Not everyone runs on the same clock, and the science now supports the idea that some variation in how much sleep people need and when they feel alert is genuinely biological, not just a habit or a preference. This episode is for anyone who sleeps - which is everyone - and wants to understand what is actually going on.

    22 min

  2. -1 J

    How Glass is Made and Used

    Glass is one of those materials that surrounds us every day - in windows, bottles, phone screens, and fiber optic cables - but most people have no idea how it actually gets made. This episode walks through the full story, from raw materials to finished product. The basic recipe for glass has not changed much in thousands of years. Silica sand is the main ingredient, but on its own it melts at around 1700 degrees Celsius, which is too energy-intensive to be practical. Manufacturers add soda ash to bring that temperature down, then limestone to keep the glass from dissolving in water. Recycled glass, called cullet, gets mixed in too because it melts faster and cuts energy costs. The blend goes into a furnace, and what comes out is a glowing, workable liquid that can be shaped in several different ways. Flat glass - the kind used in windows and buildings - is made through the float process, where molten glass is poured onto a bath of liquid tin. The glass spreads out, floats on top, and cools into a smooth, even sheet. Bottles and jars take a different route: a blob of molten glass gets pressed into a mold and then blown into shape by compressed air. Safety glass involves either heating and rapidly cooling the glass to build internal stress (tempered glass, which is four to five times stronger than regular glass), or sandwiching a plastic layer between two sheets so the whole thing holds together if it breaks. That plastic interlayer is why your car windshield cracks but does not cave in on you. Beyond the everyday stuff, there are types of glass built for specific jobs. Borosilicate glass - what lab equipment and Pyrex cookware are made from - can handle sudden temperature changes without cracking. Low-emissivity coatings on window glass reduce heat transfer, which is a big part of how modern buildings manage energy use. And the glass inside fiber optic cables is pure enough that light can travel through dozens of miles of it without fading significantly. Glassmaking dates back to at least 3600 BCE, and the invention of the blowpipe around the 1st century BCE is what made it affordable enough for ordinary people to own glass objects. If you use glass every day without thinking much about it, this episode gives you the basics of where it comes from and why different versions of it behave so differently.

    23 min

  3. 16/04/2025

    PFAS: The “Forever Chemicals” in Our Lives

    In this eye-opening episode of Learn Something, we explore the science, scope, and serious health concerns surrounding PFAS — commonly known as “forever chemicals.” These synthetic compounds, found in everything from nonstick cookware and waterproof clothing to fast food packaging and firefighting foam, are making headlines for a reason: they don’t break down easily, they accumulate in the environment and our bodies, and they’re everywhere. We break down what PFAS actually are — a massive family of over 4,000 manmade chemicals with super-strong carbon-fluorine bonds — and why their water-, oil-, and stain-resistant properties made them attractive to over 200 industries. But those same properties also make PFAS incredibly persistent and nearly impossible to eliminate once released. You’ll learn how PFAS enter our bodies through contaminated drinking water, food, dust, and direct product exposure — and how they bioaccumulate, even transferring from mother to baby. We also cover the alarming health risks, including thyroid and kidney dysfunction, weakened immune response, reproductive issues, and increased cancer risks. The episode explores what individuals can do to limit exposure — from choosing PFAS-free cookware and products to using certified water filters — while emphasizing that meaningful change must come through regulation, corporate accountability, and scientific innovation. We also dive into the complexities of detection, cleanup, and the troubling trend of “regrettable substitution,” where harmful PFAS are swapped with equally risky alternatives. Whether you’ve just heard of PFAS or have been following the headlines, this episode equips you with the knowledge to make safer choices and advocate for a cleaner, healthier future.

    16 min

  4. 15/04/2025

    Global Tariffs: Impacts and Policy Analysis

    In this episode of Learn Something, we unpack one of the most talked-about yet misunderstood tools in global economics: tariffs. From toll-like border taxes to powerful instruments of trade policy, tariffs have evolved dramatically — and their impact reaches far beyond the ports where goods arrive. We begin with the basics: What are tariffs, and how do they work? Listeners get a clear breakdown of specific tariffs (flat fees per item) and ad valorem tariffs (percentage-based rates), along with how governments set and track them through standardized systems like the Harmonized Tariff Schedule. But tariffs aren’t just economic footnotes — they’re strategic levers. We explore why countries use them: to raise revenue, protect emerging industries and jobs, influence foreign policy, and even shield consumers from low-quality imports. Yet behind these intentions lie complex consequences. We dive into the economic ripple effects: higher prices for consumers, supply chain disruptions, decreased competitiveness, and even job losses in industries the tariffs were meant to help. Real-world examples — including the U.S. steel and tire tariffs — highlight how policies intended to protect can backfire. You'll also learn how economists measure protectionism using simple averages, trade-weighted averages, and rates on dutyable goods — each with its limitations. And we don’t stop at tariffs. This episode touches on quotas, subsidies, and the broader web of trade barriers. From trade wars and retaliatory tariffs to geopolitical strategy and domestic tensions, we show how tariffs can shape — and shake — the global economy. Whether you're a business owner, policy enthusiast, or curious consumer, this episode reveals how a tax at the border can hit your wallet at home.

    17 min

  5. 14/04/2025

    The Case For Pluto: Defining Planets

    In this episode of Learn Something, we unravel the fascinating story of Pluto — its rise, fall, and the controversy that still surrounds it. Once known as the ninth planet in our solar system, Pluto captured the imagination of generations before being reclassified as a “dwarf planet” in 2006. But why did this happen, and why is the debate still ongoing? We trace Pluto’s journey from its discovery by Clyde Tombaugh in 1930 to its demotion by the International Astronomical Union (IAU). The game-changing moment came with the discovery of other large Kuiper Belt Objects like Eris, prompting astronomers to rethink what makes a planet a planet. The IAU’s new definition required that a planet orbit the sun, be nearly round, and crucially, clear its orbital neighborhood — a criterion Pluto failed due to its crowded Kuiper Belt location. But the story doesn’t end there. Prominent scientists like Alan Stern and Philip Metzger argue that Pluto should be a planet based on its rich geological complexity — including an atmosphere, methane glaciers, and potential subsurface oceans. They suggest planetary classification should focus more on what an object is rather than where it orbits. We also explore how cultural sentiment, evolving science, and powerful images from NASA’s New Horizons mission have kept Pluto in the public eye. The episode dives into the broader implications of redefining planets, the politics of scientific classification, and how even historical accidents can shape what we teach and believe. Whether Pluto is a planet, dwarf planet, or something in between, its story is a powerful example of how science evolves — and how curiosity continues to drive discovery.

    16 min

  6. 13/04/2025

    Electricity: History, Use, and Future

    In this electrifying episode of Learn Something, we explore the remarkable story of electricity — from ancient curiosity to modern innovation. We begin with early observations, like static electricity noted by Thales of Miletus and Benjamin Franklin’s iconic lightning experiment, then follow the breakthroughs that led to today’s complex electrical systems. Discover how Alessandro Volta’s battery sparked a revolution, how Faraday and Maxwell unveiled the nature of electric and magnetic fields, and how these forces are deeply connected in electromagnetism — the very foundation of light itself. We break down electricity at the atomic level, explaining electric fields, voltage, current, and the components that make up modern circuits. You’ll learn how electricity is generated, transmitted, and transformed, from the DC generators of the 1800s to the global AC grids that power our world today. The episode also delves into the renewable energy revolution — from hydropower to wind and solar — and the critical role of smart grids in handling demand, weather variability, and cybersecurity threats. We highlight major milestones, like the first U.S. wind farm in 1980 and how renewables reached 30% of global electricity in 2023. But electricity isn’t just about power lines — it’s in us. From brain signals to heartbeat rhythms, the body relies on intricate electrical activity. We even touch on nature’s electric marvels, like electric eels and atmospheric lightning. Whether you’re flipping a switch or charging your phone, there’s a vast, interconnected story behind that simple act. Join us as we illuminate the past, present, and future of electricity — the force that powers both our devices and our lives.

    19 min

  7. 12/04/2025

    AI's Growing Environmental Cost: Energy, Water, and Waste

    In this episode of the Learn Something Podcast, we dive into a side of artificial intelligence that doesn't make headlines as often as it should: energy consumption and environmental impact. While AI dazzles with its ability to generate art, write code, compose music, and drive innovation across industries, few consider the massive energy demands that power this technology. From warehouse-sized data centers to the specialized GPUs needed to train models like GPT-4, AI consumes staggering amounts of electricity—GPT-4 alone used over 50 gigawatt hours, 50 times more than GPT-3. Interactions with large language models (LLMs) can require 10x the energy of a Google search, and even generating a single image or answering a question can carry a measurable carbon and water footprint. The discussion unpacks why AI is so power-hungry, from the sheer size of the data it processes to the infrastructure that supports it. The rise of generative AI has pushed demand even higher, concentrating power usage in data hubs and straining local grids. Globally, data center electricity usage is expected to more than double by 2026. In the U.S. alone, AI-driven power needs could account for up to 6% of national consumption—possibly doubling again by 2030. Beyond energy, the podcast explores the environmental ripple effects: increased CO₂ emissions, rising water use (Microsoft’s up 34% in 2022 alone), and mounting electronic waste from rapidly obsolete hardware. Even sustainable solutions like wind and solar aren’t enough on their own, given AI's need for reliable, round-the-clock power. The episode also highlights promising paths forward: renewable energy adoption, smarter data center design, federated learning, energy-efficient hardware, and emerging AI techniques like Retrieval Augmented Generation (RAG). Policy and international cooperation are key, too—with standards and incentives helping shape a greener AI future. Ultimately, while AI holds promise to help tackle climate change, it’s vital to address the environmental cost of the technology itself. This episode offers a clear, compelling look at what’s powering the AI revolution—and the price we’re paying to keep it running.

    12 min

  8. 11/04/2025

    The Impact of Sugar Consumption on Health

    In this episode of Learn Something, we take a deep dive into one of the most common ingredients in our diets: sugar. While it’s a household staple, sugar’s story is far richer—and more complex—than most of us realize. We begin with the basics: what sugar actually is—a type of carbohydrate that comes in many forms—and trace its linguistic and cultural journey from ancient Sanskrit through Persian, Arabic, and Latin to the modern English word. Historically, sugar was a rare luxury, used more as a spice or medicine than as a daily ingredient. But as refining processes evolved, sugar became cheap, accessible, and nearly ubiquitous in modern diets. We explore the various types of sugar—sucrose, high fructose corn syrup (HFCS), agave nectar—and how they’re processed and metabolized differently in the body. You’ll learn how glucose fuels our cells, while fructose is primarily processed by the liver, with significant implications for heart health, weight gain, and insulin resistance. A key focus of the episode is on the health effects of added sugars. Drawing on CDC and Harvard studies, we break down how high sugar intake—especially from sweetened beverages—can contribute to obesity, chronic inflammation, high blood pressure, and cardiovascular disease. You’ll hear how added sugars drive insulin resistance and why they may be even more dangerous for heart health than salt. We also touch on the long-standing debate between fat and sugar, examining how decades of dietary guidelines, influenced by industry interests, may have misled the public. As a result, low-fat foods often contain high amounts of added sugars, compounding the problem. The episode wraps up with actionable advice: how to spot hidden sugars on food labels, the importance of glycemic index, and the benefits of whole, minimally processed foods. It’s not just about cutting sugar—but about making smarter, informed choices in a sugar-saturated world.

    17 min
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À propos

Welcome to "Learn Something" — the podcast that feeds your curiosity one episode at a time. Whether it’s unraveling the mysteries of space, diving into the roots of world religions, exploring economic concepts, or decoding the latest in technology, each episode brings you a fresh, bite-sized journey into a fascinating topic. No fluff, no jargon — just engaging, accessible knowledge across a wide range of subjects. Tune in, expand your horizons, and learn something new every time you listen.

Informations

  • Création
    Lifelong Learning University
  • Années d’activité
    2025 - 2026
  • Épisodes
    14
  • Classification
    Tous publics
  • Copyright
    © Lifelong Learning University
  • Site web de l’émission
    Learn Something