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Are there scientific ideas that have become too old and are actually blocking progress instead of enabling it? According to John Brockman - publisher of the world's smartest website Edge.org - there are. So he challenged the greatest scientists, artists and philosophers to answer the question: "What scientific idea needs to be retired in order to make room for new ideas to advance?" The answers he put into a book of 175 essays that he called "This Idea must die". Lawrence Pollard has been speaking to John Brockman. (Picture Credit: Wolfgang Wesener, Wowe)