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How inventions change history (for better and for worse) - Kenneth C. Davis

"Invented in 1793, the cotton gin changed history for good and bad. By allowing one field hand to do the work of 10, it powered a new industry that brought wealth and power to the American South -- but, tragically, it also multiplied and prolonged the use of slave labor. Kenneth C. Davis lauds innovation, while warning us of unintended consequences."
View the complete lesson at TED-Ed.

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New Scientist's regular column in which they highlight emerging technologies and predict where they may lead.

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