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Are you interested in playing guitar? Check out this lesson for advice on posture and picking techniques. First, you’ll learn the details of folk posture and classical posture; both have their own advantages. Next, find out how to properly hold a pick. Before you know it, you’ll be picking comfortably all the time.


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What is metaphysics, and what do metaphysicians discuss? How does metaphysics overlap with science? Plato Footnote introduces you to two robots having just this conversation. Join in for the chance to learn about issues of existence and realism, with a focus on questions of time, causation, and general relativity. Note: This lesson is crucial to watch before attempting any time travel, as it explains causal loops.


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Learn how not to write a subgame perfect equilibrium with this lesson from William Spaniel's Game Theory 101 series. Avoid the classic blunders that can trip you up and lose you points on an exam: remember that a subgame perfect equilibrium is a complete and contingent plan of action, and must state what happens on as well as off the equilibrium path of play. This lesson includes a handy trick to check your work by comparing the number of strategies you list with the number of game nodes.


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Have you ever lost points on a game theory assignment or test because you came to a slightly wrong conclusion? In this installment of his series on Game Theory, William Spaniel reveals one of the most frequent mistakes game theory students make: expressing mixed strategy Nash equilibria as decimals, not fractions. William demonstrates why 1/3 is not the same as .33, supporting his claim that when solving game theory equations, its always safe to stick with fractions.


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Want to get rid of dead skin and reveal smoother, softer, younger looking skin, but don't want to spend a fortune on beauty products? Taste4Beauty shows you how to make a DIY homemade sugar scrub that's cheap, quick, and easy to make- it only has two ingredients! This scrub will exfoliate and moisturize your skin, and improve blood circulation. You'll be revealing a glamorous new you in no time!


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Need some tips for how to apply makeup? In this lesson, Hayley reveals her everyday makeup tricks, from eyeshadow to lips. Her go-to everyday look consists of light eyeshadow blends, brow blends, eyeliner, mascara, and lipstick. Blend like a pro after this quick lesson and learn to look fabulous every day! Get your hands on the products that Hayley uses by visiting the attachments at the paperclip.


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Life's full of tough choices, and sometimes there's not just one right answer: there are infinitely many. In this Game Theory 101 lesson by William Spaniel, learn about scenarios in which a set of mixed strategies can lead to an infinite number of Nash equilibria. Review concepts like strict dominance, pure strategy Nash equilibria, and partially mixed strategies - and discover how one player's pure strategy can result in another player's indifference.


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How do you determine right from wrong when human lives are on the line? Follow along with Professor Massimo Pigliucci as he considers the philosophical and neurobiological answers to this question. This lesson offers a review of Aristotle's virtue ethics, Kant's deontology, and Bentham and Mill's utilitarianism, and then analyzes the classic philosophical thought experiment, the Trolley Dilemma. Learn how different parts of the brain are used for making rational versus emotional moral judgments.


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Why bend over backwards- or bend over at all- to pick up a tennis ball? Lock and Roll tennis teaches you how to perform Rafael Nadal's sweet trick for getting the tennis ball off the ground using just his feet. It's a stylish, hip, and effortless way to retrieve a ball, especially when you're practicing your tennis swings and have a lot of balls to collect!


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Looking for an exercise that’ll help you strengthen your core and lose weight? This Pilates workout for beginners teaches you how to practice ribcage breathing, curling sit ups, and head and shoulder raises. Inhale and exhale in a steady rhythm to get the ultimate workout. Get into a routine and watch your body change!


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Want to make a fun and colorful alcoholic drink? In this lesson, The Vegetarian Baker teaches you how to infuse Absolut Vodka with jelly beans, making the vodka colorful and sweet. Using mini vodka bottles and jelly beans, you can create a cheerful mini-fridge-sized drink with a kick. It's the perfect way to get a little of your inner child into your adult beverage!


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The anatomy of an acoustic guitar and a human body have more similarities than you would think. This lesson shows you how to identify all parts of an acoustic guitar, including the head, the neck, and the body. You’ll understand directional terminology such as “up” the neck and “down” the neck, and explore the basics of electronic extras.


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Learn when and why to burn your bridges (i.e., limit your own options) in this lesson on creating credible threats in subgame equilibrium game theory. When two countries on opposites sides of a river are seeking control over an island - why should the first country invade the island, burn the bridge leading home, and cut off its route of retreat? Follow along with William Spaniel as he uses the Burning Bridge game theory scenario to illustrate the use of backward induction and credible threats.


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Find out how accessible reading music can be. This lesson on how to read tabs will cause you to pick up that old guitar and learn a few new songs. First, you’ll see how the strings are positioned in a tab image and learn to identify fret numbers. Then, learn whether to play notes simultaneously or in a series. Before you know it, you’ll be fluent in guitar tabs.


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Don’t think you’re cut out for playing guitar? Think again! Everyone gets frustrated. Even Jimi Hendrix wasn’t a rock god from day one. Check out this lesson for advice on learning how to play guitar and the encouragement to keep doing it. You’ll surely want to continue pickin’ after hearing these words of wisdom. Practice and persist!


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Are you learning how to play guitar? Interested in the mechanics of how to make a low-pitched noise versus a high-pitched noise? This lesson examines the basic physics of sound, from pitch range to volume control. Check out this lesson and discover how to create the sound you want - including how to adjust the volume of your guitar without a control knob!


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A recent book written by Sam Harris called The Moral Landscape argues that science can answer moral questions, and has caused quite a bit of discussion on the matter. Enter into this dialogue, and discover what both sides of the debate have to say. In this lesson from Plato Footnote, learn what makes a fact, fact, and what contributions science can make in the field of ethics (for example). Finally, this lesson concludes with a short exploration of moral relativism, Plato, and the divine.


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Was your mountain bike chain damaged while chasing wild trails? In this second of two lessons on repairing bike chains, Art's Cyclery teaches you how to identify, remove, and replace bad links in your bicycle chain. Learn how to retain the old pin so that you can use it to attach new links, how to line up and insert new links (using the tool you created using the previous lesson), and how to get the newly repaired chain flexible enough that it can make the journey home.


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You've tackled Game Theory 101, so what's next? William Spaniel gives you a sneak preview of more advanced Game Theory concepts such as repeated games and incomplete information. What the heck is a Bayesian Nash equilibrium? Who gets a better deal in a negotiation, and why? How and when is war inefficient? Why do people vote? All these questions and more can be answered with the magic—um, science—of game theory!


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