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Scientific perceptions can sometimes shift so rapidly that it is difficult to remember an earlier reality. A decade ago, there were no topographical images of DNA in its natural, watery environment. What instead ruled the popular imagination, and to some extent the scientific one, was the double-helix icon and its elegant edifice of genes. This aesthetic view, even when elaborated by fluorescent staining images, said nothing about DNA's tensile properties and other physical properties, or about its ability to unwind prior to replication at speeds of more than 8,000 revolutions per minute. continued...
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