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<blockquote><a href="http://quotationsbook.com/quote/32654/">The characteristic of scientific progress is our knowing that we did not know.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/373/">Bachelard, Gaston</a> on <a href="http://quotationsbook.com/quotes/tag/progress/">progress</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>