RECENTLY POLYMERASE chain reaction (PCR) has been compared with the introduction of the printing press.
Before the advent of movable type, scholarship was greatly hindered by a lack of access to necessary texts. Even a journey to the library of a far-away monastery did not guarantee finding one of the few existing copies of a book, and the volume, once found after a long search, might prove to be a faulty copy produced by a careless scribe. Gutenberg's invention of printing from movable type revolutionized scholarship, leading to an explosion of new knowledge.1
Dorfman D, Bauchner H. The Impact of New Diagnostic Tests on the Management of Children With Fever. Arch Pediatr Adolesc Med. 2000;154(8):761–762. doi:10.1001/archpedi.154.8.761
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