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Why don't perpetual motion machines ever work? – Netta Schramm

Check out our Patreon page: https://www.patreon.com/teded View full lesson: http://ed.ted.com/lessons/why-don-t-perpetual-motion-machines-ever-work-netta-schramm Perpetual motion machines — devices that can do work indefinitely without any...
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The world’s most mysterious book – Stephen Bax

View full lesson: http://ed.ted.com/lessons/the-world-s-most-mysterious-book-stephen-bax Deep inside Yale's Beinecke Rare Book and Manuscript Library lies a 240 page tome. Recently carbon dated...
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History’s deadliest colors – J. V. Maranto

View full lesson: http://ed.ted.com/lessons/history-s-deadliest-colors-j-v-maranto When radium was first discovered, its luminous green color inspired people to add it into beauty products...
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The history of tea – Shunan Teng

View full lesson: http://ed.ted.com/lessons/the-history-of-tea-shunan-teng Tea is the second most consumed beverage in the world after water –– and from sugary Turkish...
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How does asthma work? – Christopher E. Gaw

View full lesson: http://ed.ted.com/lessons/how-does-asthma-work-christopher-e-gaw More than 300 million people around the world suffer from asthma, and around 250,000 people die from...
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What is entropy? – Jeff Phillips

View full lesson: http://ed.ted.com/lessons/what-is-entropy-jeff-phillips There’s a concept that’s crucial to chemistry and physics. It helps explain why physical processes go one...
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The three different ways mammals give birth – Kate Slabosky

View full lesson: http://ed.ted.com/lessons/the-three-different-ways-mammals-give-birth-kate-slabosky All mammals share certain characteristics, like warm blood and backbones. But despite their similarities, these creatures also...
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Why do we itch? – Emma Bryce

View full lesson: http://ed.ted.com/lessons/why-do-we-itch-emma-bryce The average person experiences dozens of individual itches each day. We’ve all experienced the annoyance of an...
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Why do animals have such different lifespans? – Joao Pedro de Magalhaes

Check out our Patreon page: https://www.patreon.com/teded View full lesson: http://ed.ted.com/lessons/why-do-animals-have-such-different-lifespans-joao-pedro-de-magalhaes For the microscopic lab worm C. elegans, life equates to just a...
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Why do people get so anxious about math? – Orly Rubinsten

View full lesson: http://ed.ted.com/lessons/why-do-people-get-so-anxious-about-math-orly-rubinsten Have you ever sat down to take a math test and immediately felt your heart beat faster...