"Biologist Richard Dawkins has argued famously that ideas spread from mind to mind much as viruses spread from host to host. It's an exhilaratingly cynical view, because it suggests that to succeed, an idea need not be true or even useful, as long as it has what it takes to propagate itself. (A religious faith that disposes its believers to become martyrs may be quite false, and lethal to its adherents, yet persist if each martyr inspires others.)"
http://www.slate.com/id/1910/
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