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Published in : 2015-03-17 | by TED-Ed
View full lesson: http://ed.ted.com/lessons/plato-s-allegory-of-the-cave-alex-gendler Twenty four hundred years ago, Plato, one of history's most famous thinkers, ...
Published in : 2017-01-31 | by TED-Ed
View full lesson: http://ed.ted.com/lessons/the-science-of-milk-jonathan-j-o-sullivan The milk industry produces in excess of 840 million tons of products each ...