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The elephant is a creature of epic proportions — and yet, it owes its enormity to more than 1,000 trillion microscopic cells. And on the epically small end of things, there are likely millions of unicellular species, yet there are very few we can see with the naked eye. Why is that? Why don’t we get unicellular elephants? Or blue whales? Or brown bears? Murry Gans explains.
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There’s an organism that changed the world. It caused the first mass extinction in Earth’s history … and also paved the way for complex life. How? Anusuya Willis explains how cyanobacteria, simple organisms that don’t even have nuclei or any other organelles, wrote a pivotal chapter in the story of life on Earth.
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This is so amazing information, thank you.
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Though people are most familiar with Plato’s fictional Atlantis, many real underwater cities actually exist. Peter Campbell explains how sunken cities are studied by scientists to help us understand the lives of our ancestors, the dynamic nature of our planet, and the impact of each on the other.
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En eL Envío Que Escribí Ay Una InisiaL E iTervesion Ami PAgiNa yo no puse ES VB es To ES DEMAs VB BLoquer ESTA IgnisiL VB. V B ESTas ILetras VB B yA VB ApAresio Ustedes VB i ya me cansé VB De Todo CanseLar EsTe VB ViRuS OKEY mñn a love por favor hay una persona que es juega con este con esta página me ha cancelado por favor en Facebook quiero poner una nueva página están las iniciales a y b de vaca y b de burro a cada momento Esto me está interfiriendo todo el tiempo estoy cansada de ver esas iniciales por favor borrarlo o cancelar
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As the number of “potentially habitable” planets that astronomers find continues to rise, we seem ever closer to answering the question, “Are we alone in the universe?” But should we be looking for life elsewhere? If we were to find life in one of these worlds, should we try to contact any beings who may live there? Is that wise? Aomawa Shields navigates the murky waters of pursuing curiosity.
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We humans have a hard enough time getting along with each other, let alone other species.
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Decades after the fall of the Third Reich, it feels impossible to understand how Adolf Hitler, the tyrant who orchestrated one of the largest genocides in human history, could ever have risen to power in a democratic country. So how did it happen, and could it happen again? Alex Gendler and Anthony Hazard dive into the history and circumstances that allowed Hitler to become Führer of Germany.
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In 2010, 30 billion dollars worth of fruits and vegetables were wasted by American retailers and shoppers, in part because of cosmetic problems and perceived spoilage. But what are these spots, anyway, and are they okay to eat? Elizabeth Brauer explains why you may not need to be afraid of picking up your grocery store’s funky-looking fruit.
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“Parts per million” is a scientific unit of measurement that counts the number of units of one substance per one million units of another. But because it’s hard to conceptualize really large numbers, it can be difficult to wrap our brains around what “one part per million” really means. Kim Preshoff (with help from 100+ animators from the TED-Ed Community) shares nine helpful ways to visualize it.
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For the 64% of Americans that drink coffee daily, an expedient cup is practically essential. But preparing coffee hasn’t always been easy. In the second installment of our ‘Moments of Vision’ series, Jessica Oreck shares the ingenuity of one coffee mill worker who made it considerably quicker for you to get your fix of caffeine.
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Sunscreen comes in many forms, each with its own impacts on your body and the environment. With so many options, how do you choose which sunscreen is best for you? To answer that question, Mary Poffenroth explains how sunscreens work and compares different application methods, SPFs, and active ingredients to help you make the best choice.
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For the majority of recorded human history, units like the weight of a grain or the length of a hand weren’t exact and varied from place to place. Now, consistent measurements are such an integral part of our daily lives that it’s hard to appreciate what a major accomplishment for humanity they’ve been. Matt Anticole traces the wild history of the metric system.
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Amazing information.
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We live in an age of protest. On campuses, in public squares, on streets and social media, protestors around the world are challenging the status quo. But while protest is often necessary, is it sufficient? Eric Liu outlines three strategies for peacefully turning awareness into action and protest into durable political power.
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Not possible
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TED-Ed is TED's new education initiative.
Introduction
TED-Ed's mission is to capture and amplify the voices of great educators around the world. We do this by pairing extraordinary educators with talented animators to produce a new library of curiosity-igniting videos. Our site, ed.ted.com, features these new TED-Ed Originals as well as some powerful new learning tools.

ed.ted.com
youtube.com/TEDEducation