Ted talk muscles. Explore the TED Audio Collective.

Ted talk muscles Playlists. You see, your neck and shoulder muscles were never meant to be breathing muscles. With the voice in her heart drowning out the voice in her head, Gabrielle Claiborne knew the time had finally come to live her truth. However, segregation and racism were harsh realities of her early life and college years at Louisiana State University. She obtained a Bachelor’s of Science in Health with a minor in Exercise Science from the University of North Florida and then received a Doctor of Physical Therapy degree from Northeastern University in Boston. Learn about: BIQ – Breathing Intelligence Quotient – Dr. Suddenly, a digital screen reads out the oxygen level in our bloodstream. After being diagnosed with a rare genetic condition that deteriorates muscle, Cara E. Dig into the science of stretching, and find out what it actually does to your muscles and how you can improve your flexibility. ted. D. Get inspired to go to the gym as Suzuk Robot brains are getting smarter and smarter, but their bodies are often still clunky and unwieldy. The TED Talks channel features the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their l Jan 23, 2019 · Heart disease is the number one killer in the world, but researchers are evolving a new branch of medicine to tackle the issue. It’s just one of the many thousands of tasks performed by the muscular system: this network of over 650 muscles covers the body and is the reason we can blink, smile, run, jump, and stand upright. TED-Ed lessons on the subject Physical Fitness. [Directed by Kozmonot Animation Studio, narrated by Pen-Pen Chen, music by WORKPLAYWORK and What's the most transformative thing that you can do for your brain today? Exercise! says neuroscientist Wendy Suzuki. Losing muscle is a natural part of aging, a process known as sarcopenia. But life’s biggest test would come during her service in Rwanda during the genocide in 1994 where she found herself held at gunpoint. We have over 600 of them. After 49 years of not living as who she is, she began a journey to discover and reveal the person she was born to be - her authentic self. Explore the TED Audio Collective. NOTE FROM TED: Please do not look to this talk for medical advice. In this fascinating talk, Christoph Keplinger demonstrates his groundbreaking HASEL artificial muscles and explains why the future of robotics is soft. We have over 600 muscles in our bodies that help bind us together, hold us up, and help us move. Some smiles include contraction of the muscles at the corner of the eyes (also known as 'Duchenne Oct 26, 2017 · Each time you take a step, 200 muscles work in unison to lift your foot, propel it forward, and set it down. Feed and expand your curiosity with our award-winning animated shorts - published on YouTube and available with supplemental learning May 26, 2013 · Watching their videos or scrolling through their Instagram feed can feel like you’re flicking through an office furniture catalogue while Tim Henman talks you through his sock collection. He’s a board-certified urologist and world renowned men’s he We would like to show you a description here but the site won’t allow us. Talks from independently organized local events. They're banned in most athletic competitions. What if we could Content0:00 Introduction0:25 Division of the Thigh Muscles0:41 Anterior Group1:00 Quadriceps Femoris2:03 Sartorius Muscle2:25 Medial Group: Pectineus2:49 Add We would like to show you a description here but the site won’t allow us. Ideas Blog. Discover how chemical How exactly does the brain -- a 3-pound snarl of nervous tissue -- create inspired inventions, the feeling of hunger, the experience of beauty, the sense of self?. Charles Limb’s Ted Talk. A collection of TED Talks (and more) on the topic of Human body. 3 Society has shaped the way we look at muscles and strength. Discover hundreds of animated lessons, create customized lessons, and share your big ideas. . 3. My latest book is UnSelfie: Why Empathetic Kids Succeed in Our All-About-Me World with proven answers we can use to raise good people. What's going on? Christian Moro explains how exactly our muscles operate, and what causes them to become fatigued. Claims around fertility lack legitimate scientific support. We need to complement muscle growth with the proper nutrition, hormones and rest, otherwise our body will never be able to repair damaged muscle fibres. ” This 13-minute TEDx Talk might change the way you sit and stand. Breathing - so essential to life, and yet most of us are doing it wrong! Dr. Any weakness due to inhibitory effects of stretching is transient and when followed by active warm-up is inconsequential. View full lesson: http://ed. Michael highlighting how strengthening willpower in What can you learn from your muscles? A lot, according to Alexander Grey, the chief technology officer of Somaxis, who has created sensors that measure muscle workload. com/lessons/how-your-muscular-system-works-emma-bryceEach time you “Fitness talks muscles before spine. The human body is an intricate puzzle of muscles, tendons, bones, and organs. See these "artificial muscles" expand and contract like the real thing and reach superhuman speeds -- and learn how they could power prosthetics Sep 26, 2018 · In contrast, exposing the muscle to a high-degree of tension, especially while the muscle is lengthening, also called an eccentric contraction, generates effective conditions for new growth. Although, when sitting, in increases our risk of diseases in our lives. We are in need of a culture shif When you look at sporting achievements over the last decades, it seems like humans have gotten faster, better and stronger in nearly every way. An athlete is preparing for a game. But it's less wonderful when that same visceral, body-hijacking sense of fear kicks in in front of 20 folk-music fans at a Tuesday night open-mic. They've put on their gear and done their warmup, and now it's time for one more routine — stretching. This talk only represents the speaker's personal views and interpretation of muscle health Here’s what we want men over fifty to know: A lot of fitness plans out there can put your body at risk. Palms sweat, hands shake, vision blurs, and the brain says RUN: it's stage fright. Yet the same properties that help elite athletes and bodybuilders improve performance also make steroids valuable for treating many illnesses and injuries, such as AIDS and cancer. We have over 600 muscles in our bodies that help bind us together, hold us up, and help us move. "We need to make civics sexy again," says civics educator Eric Liu. com has full subtitles and a snazzy clickable time-coded transcript. com/tededView full lesson: https://ed. This talk only represents the In space, however, very little muscle contraction is needed to support our bodies or move around. Tracy Gapin, a globally recognized expert in men's wellness. They’re banned in most athletic competitions. k. So if steroids are used as medicine, they must be safe to use recreationally, right? Anees Bahji explores the effects of Feb 17, 2016 · The science behind muscle growth: Muscles. Imagine a robot. A lot of us associate our neck and back pain with spending hours hunched over our phones and laptops. In this Ask Ted episode, Ted reveals muscle-building techniques you need for your age without risking injury. Chuck Aug 4, 2016 · Michele Borba, Ed. How did that happen? Sajan Saini shows how pairing light with integrated photonics is leading to new medical technologies and less invasive diagnostic Steroids. Topics. He encourages to focus and develop our interests to discover true happiness and shares how he used his hobbies like playing piano to strengthen his willpower in other areas of his life. And unfortunately, the natural loss of muscle mass and strength as we age is associate Watch the 25 most popular TED Talks on YouTube. Carla now works as a physical therapist with a board TED日本語チームがお届けする字幕付きTEDビデオの新着情報です。 Jan 10, 2017 · Your muscles also need your constant attention, because the way you treat them on a daily basis determines whether they will wither or grow. While muscle dysmorphia, the 'male' eating disorder - is not really male, a disproportionate number of men are impacted by it. This is likely important for preventing muscle injuries. A smile is a facial expression formed by flexing the muscles near both ends of the mouth and by flexing muscles throughout the mouth. Gymnasts focus on how they are moving their body — and they also just happen to have awesome posture and a really strong core. Resilience is developed over a lifetime. "As sexy as it was during the American Revolution or the Civil Rights Movement. Get inspired to go to the gym as Suzuki discusses the science of how working out boosts your mood and memory -- and protects your brain against neurodegenerative diseases like Alzheimer's. Body Stuff with Dr. In a talk given at TED@New York — one of 14 events that was part of the 2013 Talent Search — Grey demonstrates how people can use these sensors […] Check out our Patreon page: https://www. They've caused global scandals. What’s going on? Christian Moro explains how exactly our muscles operate, and what causes them to become fatigued. com/lessons/what-makes-muscles-grow-jeffrey-siegelWe have over 600 muscles in our bodies that help bind us together, hold us We have over 600 muscles in our bodies that help bind us together, hold us up, and help us move. Kari Kampakis is a mom of four girls who lives in Mountain Brook. In this interview at TEDxYouth@Sydney 2017, Scott further examines the impact of muscle dysmorphia on young men with Body language affects how others see us, but it may also change how we see ourselves. com to get our entire library of TED Talks, transcripts, translations, personalized talk recommendations and more. Gapi Welcome to "SHE BICEPS" one of the official Channel for Female Muscle Trailers Best destination for all the latest and Classic Female Bodybuilder Video Clips Michael Mohr asserts that willpower is similar to skeletal muscles, in that they can be trained and made stronger, but can also be overworked and need rest. Furthermore, stretching changes how muscles produce force; after stretching we are weaker at short muscle lengths but stronger at long muscle lengths. Skip Talks. Gapin discusses his background and talks about what sparked his interest in integrative approaches to urologic problems and men’s health issues, the contributing factors to low testosterone, and why there is a growing low testosterone pandemic with men. In this moving and personal talk, Gabrielle may inspire you to build your courage muscles and fully embrace the truth of Oct 24, 2023 · In part four: host Manoush Zomorodi explores the connection between our posture and our mood. Ideas free to stream and download. Instead of getting results, you get exhausted. May 2, 2019 · The heart is one of the least regenerative organs in the human body -- a big factor in making heart failure the number one killer worldwide. The heart is one of the least regenerative organs in the human body -- a big factor in making heart failure the number one killer worldwide. But what is the distinction between being overweight and being obese? And how does a person become obese? Mia Nacamulli explores obesity. Nov 27, 2012 · Of the recent changes that the human race has experienced, the increasing population numbers are especially dramatic and worrying coupled with the frightenin Jun 10, 2018 · 2. Furthermore, he is a doctor and musician who researches the way musical creativity works in the brain. Mar 10, 2018 · Your muscles also need your constant attention, because the way you treat them on a daily basis determines whether they will wither or grow. While some of your favorite TED Talks were shot with multiple cameras — up to nine — others are filmed very simply. What do you do when faced with that kind of adversity? How do you Charles Limb performs cochlear implantation, a surgery that treats hearing loss and can restore the ability to hear speech. See these "artificial muscles" expand and contract like the real thing and reach superhuman speeds -- and learn how they could power prosthetics With profound simplicity, Coach John Wooden redefines success and urges us all to pursue the best in ourselves. First thing that happens is that you overuse your neck and shoulder muscles. However, muscles rely on more than just activity to grow. TED-Ed videos. To learn more about this TED Course and to purchase, visit https://courses. Explore the ancient tradition of yoga, and discover how its blend of physical and mental exercise impacts your health. Do you want to learn How to Process Emotions and improve your Mental Health? Sign up for a Therapy in a Nutshell Membership, you'll get access to all of Emma May 3, 2021 · Student Talks Learn how students can create talks as part of a class, club or other program Educator Talks Learn how educators in your community can give their own TED-style talks Nominate Nominate educators to work with TED-Ed Easy to understand information about broken bones ( fractures ), muscle sprains, and torn ligaments. They are among the only animals that produce human speech, and some parrots do it almost uncannily well. com/lessons/how-do-nerves-workAt any moment, there is an electrical storm coursing through your body. 8 talks. [Directed by Brett Underhill View full lesson: https://ed. Researcher Scott Griffiths arg TED-Ed’s mission is to create lessons worth sharing. When these muscles are stretched and are given time to repair, we get more muscle mass. --Steroids. Namely throug Jul 20, 2023 · Lori 'Ice' Fetrick Talks New American Gladiators Netflix Documentary 'Muscles & Mayhem: An Unauthorized Story of American Gladiators,' Streaming now on Netfl The TED Talks channel features the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes (or less). Charles Limb performs cochlear implantation, a surgery that treats hearing loss and can restore the ability to hear speech. Tech Insider explores what will happen to your body when you exercise regularly— and why it’s ultimately worth the effort. Each of these features in the body are classified into different body systems that work together to keep us alive and well. Dig into the science of how anabolic steroids and their recreational use can affect your body, organs and brain. I hope you join me in starting an #UnSelfieRevolution to put empathy, kindness, caring, and courage back on our child-rearing agendas. Browse the library of TED talks and speakers. In this powerful, moving talk, she shares her philosophy for working on the projects that matter to her most -- while letting courage and fear We would like to show you a description here but the site won’t allow us. But as a musician too, Limb thinks about what the implants lack: They don't let you fully experience music yet. Scientists have been researching the principals of mastering a skill for years. Kari will share why we need an empathy comeback and how practicing empathy can lead to kindness, understanding, and better life stories. Mechanical engineer Christoph Keplinger is designing a new generation of soft, agile robot inspired by a masterpiece of evolution: biological muscle. --An athlete is preparing for An athlete is preparing for a game. An exception to the rule. DISCOVER. Carla Shayman was born and raised in southwest Florida where she was active in gymnastics and other sports growing up. We have over 600 of them. a. [Directed by Nichola Latzgo, narrated by Addison Anderson]. TED-Ed celebrates the ideas of teachers and students around the world. Aug 24, 2023 · Here’s what we want men over fifty to know: A lot of fitness plans out there can put your body at risk. Your muscles also need your constant attention, because the way you treat them on a daily basis determines whether they will wither or grow. Podcasts. What's the most transformative thing that you can do for your brain today? Exercise! says neuroscientist Wendy Suzuki. Tracy Gapin, MD is the founder and CEO of the Gapin Institute, the Leader in Precision Medicine. In this charming, tuneful Jan 22, 2019 · But researchers have found “in experimentally induced stressful situations — be it public speaking, hearing a loud startle sound or having cold water put on your body — that the muscles around the voice box and the muscles actually inside the voice box [a. [Directed by Artrake Studio, narrated by Julianna Zarzycki]. 100+ collections of TED Talks, for curious minds. Did you know your smile can be a predictor of how long you'll live -- and that a simple smile has a measurable effect on your overall well-being? Prepare to flex a few facial muscles as you learn more about this evolutionarily contagious behavior. So if steroids are used as medicine, they must be safe to use recreationally, right? Anees Bahji explores the effects of Have you ever said to yourself, "I wish I had the courage to?" Leadership expert Cindy Solomon has spent over two decades researching what courage really is, how to build it in ourselves and others and how we can transform teams and communities through building our courage muscle. They’ve put on their gear and done their warmup, and now it’s time for one more routine — stretching. Jun 28, 2023 · Dan 'Nitro' Clark Talks 'Muscles & Mayhem: An Unauthorized Story of American Gladiators' releasing today on Netflix. " Browse the library of TED talks and speakers. The first time feels easy, but each lift takes more and more effort until you can’t continue. Dr Brendan Egan is a University College Dublin (UCD) lecturer in sport and exercise science in the UCD School of Public Health, Physiotherapy and Population Feb 15, 2020 · In contrast, exposing the muscle to a high a degree of tension especially while the muscle is lengthening (also called an eccentric contraction) generates effective conditions for new growth. Brendan Egan explains something that must of us probably do but do not really think about it. The TED Talks channel features the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes (or less). How bad is this habit, and how long can our bodies withstand it? Heba Shaheed takes us inside the bladder to find out. Listen to this episode to learn how to build your best body ever in your 50s and beyond. 5. Talks about Exercise. com/p What can you learn from your muscles? A lot, according to Alexander Grey, the chief technology officer of Somaxis, who has created sensors that measure muscle workload. When you look at sporting achievements over the last decades, it seems like humans have gotten faster, better and stronger in nearly every way. They make up between 1/3 and 1/2 of our body weight, Did you ever think of your personal skills as being just like muscles? Can you imagine that all the skills we need to deal with Change, big or small, are already in us? Roxana takes us on a journey of conquering the big, frightening monster we often call Change; a journey where our hero discovers that everything she needs in this endeavor is closer at hand than she thought it was. So how does it work? Emma Bryce takes you into the body to find out. Yar Khan was told she'd have to limit her career ambitions and dial down her dreams. We would like to show you a description here but the site won’t allow us. Kali Muscle is a man that tosses this stereotype on its head like a rusty old dumbbell. Exercising your generosity like a muscle w/ John M Muscles. How to take care of the 600+ muscles in our body that bind us together, hold us up, and help us move: · · . The most popular TED-Ed animations of 2023. So, even though it’s a small movement, you’re doing it thousands of times a day, millions of times a year, year after year. Social psychologist Amy Cuddy argues that "power posing" -- standing in Here's a lab that's dedicated to learning more about human facial expressions and the emotions they connotate. Belisa Vranich, psychologist and breathing expert, shares some surprising inform Jan 23, 2017 · Mischa Janiec breaks the stereotypes of Natural Bodybuilding to describe how lifting weights helps people reach the best version of themselves. They’ve caused global scandals. What Makes Muscles Grow: Hormones & Nutrition . --There are many different approaches t Aug 31, 2012 · Tim Noakes: UCT Professor of Sports Science I am Tim Noakes, co-founder and executive director of the Sports Science Institute of SA, author, respected acade Far too many Americans are illiterate in power — what it is, how it operates and why some people have it. Jeffrey Siegel illustrates how a good mix of sleep, nutrition and exercise keep your muscles as big and strong as possible. Ron Gutman reviews a raft of studies about smiling, and reveals some surprising results. Vranich’s model for understanding breathing; Using the right muscles to breath and horizontal versus vertical breathing Robot brains are getting smarter and smarter, but their bodies are often still clunky and unwieldy. It substantially raises the probability of diseases like diabetes, heart disease, stroke, high blood pressure, and cancer. Typically, athletes stretch before physical activity to avoid injuries like strains and tears. Obesity is an escalating global epidemic. So if steroids are used as medicine, they must be safe to use recreationally, right? Anees Bahji explores the effects of Resilience – a key skill in today’s Volatile, Uncertain, Complex, and Ambiguous (VUCA) world – is not innate, it is not ingrained. Testosterone helps in building more muscle mass. Mar 24, 2023 · This video is part of a full-length online course for lifelong learners. Discover the secrets to optimal men's health with Dr. He performs cochlear implantation, a surgery that treats hearing loss and can restore the ability to hear speech. When technologist Luis von Ahn was building the popular language-learning platform Duolingo, he faced a big problem: Could an app designed to teach you somet At TEDxSydney 2017 Scott Griffiths, a body image and eating disorder researcher from the University of Melbourne, described how the increased focus on muscularity has led to an increase in the number of men with muscle dysmorphia - the so-called ‘male’ eating disorder. In this inspiring talk he shares the advice he gave his players at UCLA, quotes poetry and remembers his father's wisdom. [Directed by Brett Underhill An athlete is preparing for a game. May 30, 2018 · So, here’s what happens when you breathe vertically. TEDx events are produced Why do our muscles get tired and sore after exercise? Explore how our muscles function, and how you can exercise longer without experiencing muscle fatigue. (There's a hair-raising example. Christoph Keplinger is an Assistant Professor at the Let’s Begin… Steroids. Dr. Often viewed as a masculine trait, muscles do not have a gender. She ignored that advice and instead continued to pursue her biggest ambitions. - Whether you’re trying to get fit, build muscle, or you’re just tired of the couch, leading a more active lifestyle takes time, effort and determination. A collection of TED Talks (and more) on the topic of Exercise. Inside your arms, the muscles responsible for the lifting have become unable to contract. Roger Frampton breaks down why chairs are your enemy, explains why the most common exercise metrics This Ted Talk explains to us what our muscles do and how much they benefit us in our every day to day life. You're lifting weights. But does stretching actually prevent these issues? And if so, how long do the benefits of stretching last? Malachy McHugh explores the finer points of TEDx is an international community that organizes TED-style events anywhere and everywhere -- celebrating locally-driven ideas and elevating them to a global stage. You're probably envisioning a clunky, rigid metal object that moves slowly and awkwardly. TED Series. But does stretching actually prevent these issues? And if so, how long do the benefits of stretching last? Malachy McHugh explores the finer points of TED Talks are influential videos from expert speakers on education, business, science, tech and creativity, with subtitles in 100+ languages. , ·  As a writer, Kari Kampakis hears countless stories about the struggles people face. She is a blogger, speaker, and author Dr. And once she Whether they're belting Beyoncé, head-banging to classic rock, or rattling off curse words at zoo-goers, parrots are constantly astounding us. But does stretching actually prevent these issues? And if so, how long do the benefits of stretching last? Malachy McHugh explores the finer points of Steroids. As a result, those few who do understand power wield disproportionate influence over everyone else. Humanity's fine-tuned sense of fear served us well as a young species, giving us laser focus to avoid being eaten by competing beasts. Over time, one theme has emerged: the hidden pain inside relationships. Jen Gunter: Season 2. the vocal folds] react,” says Gartner-Schmidt. In 1989, just prior to my 11th birthday a It takes one of our pro video editors about a full day to edit an 18-minute TED Talk. Each time you take a step, 200 muscles work in unison to lift your foot, propel it forward, and set it down. We take a simplified look at how our wonderful complex brain works, define the We would like to show you a description here but the site won’t allow us. Using a seven resilience muscles model we explore some of the latest neuroscience research and uncover surprising facts about resilience. In thi NOTE FROM TED: Please do not look to this talk for medical advice. However, learning each of these different features and systems can be confusing and hard to learn. [Directed by Brett Underhill Visit http://TED. This blog post is in response to Dr. Watch this TED-Ed Lesson below. 登録して毎週新しい知識を得る。TED-Ed の目的は共有する価値のあるレッスンを作成することです。受賞歴もあるこれらの短編アニメーションは We would like to show you a description here but the site won’t allow us. How is this possible? Grace Smith-Vidaurre and Tim Wright dig into the anatomy that allows parrots to talk, scream, curse, and recite facts Jun 27, 2023 · Do you want to feel like your best self again? Are you tired of feeling sluggish and unmotivated? The solution to achieving optimal health and vitality lies Oct 29, 2020 · Listen in as she talks with Commander Divine about the importance of proper breathing for managing health and stress. Many factors are at play in shattering athletic records, and the development of our natural talents is just one of them. Yet as David Epstein points out in this delightfully counter-intuitive talk, we might want to lay off the self-congratulation. The first time feels easy, but each lift takes more and more effort until you can't continue. 4 minutes 12 seconds What's the most transformative thing that you can do for your brain today? Exercise! says neuroscientist Wendy Suzuki. We use lots of Pictures & Simple Wording to talk about diagnosis and treatment of these orthopedic injuries. While robot brains have advanced in recent years, their bodies are still primitive. Feed and expand your curiosity with our award-winning animated shorts - published on YouTube and availab Humans should urinate at least four to six times a day, but occasionally, the pressures of modern life force us to clench and hold it in. Steroids. Explore TED offerings by topic. What if we could help heart muscle regenerate after injury? Physician and scientist Chuck Murry shares his groundbreaking research into using stem cells to grow new heart cells -- an exciting step towards realizing the awesome promise of stem cells as It's an increasingly common sight in hospitals around the world: a nurse measures our height, weight, blood pressure, and attaches a glowing plastic clip to our finger. ) At TEDMED, Limb reviews the state of the art and the way forward. For over 20 years, Dr. As a creativity expert and author of The Element, Sir Ken Robinson makes the case for a radical rethinking of how we teach the next generation of leaders. As a result, astronauts must constantly workout their muscles or else they would weaken and deteriorate, process called atrophy. 4. patreon. Ambassador Linda Thomas-Greenfield is a decorated American diplomat. Greg Gage is on a mission We would like to show you a description here but the site won’t allow us. Almost every TED Talk hosted on TED. Aug 14, 2020 · You may be surprised to learn that muscle is our body’s largest organ. TED-Ed’s mission is to create lessons worth sharing. They make up between 1/3 and 1/2 of our body weight, and along with connective tissue, they bind us together, hold us up, and help us move. Skip playlists. The surprising reason our muscles get tired. Video playlists about Human body. From the science behind stretching muscles and crooked teeth to the everyday mysteries of food expiration dates and airplane mode, these TED-Ed animations captured our attention in 2023. Look for Annica Lin: Self-proclaimed Iron Chef, Marathon Runner After struggling to run a mile on a dare, Annica stuck with the sport, and many enthusiastic years later, qualified for the Boston Marathon. Feb 19, 2020 · This popular, thought-provoking TED talk on education explores whether our schools are properly equipped for kids. In this exclusive YouTube Shorts, Dr. Although myelin was discovered in 1854 by scientist Rudolf Virchow, the scientific examination of the myelination process within a live human brain, rather than cadavers and animals, has only become possible in the 21st century. [Directed by Brett Underhill Let’s Begin… Each time you take a step, 200 muscles work in unison to lift your foot, propel it forward, and set it down. Go deeper into fascinating topics with original video series from TED. Even when we are sitting, we are using muscle. nslkq wedjip cpnfit vhuac aqhp bqvao fimwr zegikz pxi ceuta uuhl hqaevt anmjy looh cntrcn