Partly because of the fundamental importance of the paper, elucidating the structure of DNA; partly for the wonderfully understated third to last paragraph: "It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material."
http://www.nature.com/physics/looking-back/crick/index.html
Partly because of the fundamental importance of the paper, elucidating the structure of DNA; partly for the wonderfully understated third to last paragraph: "It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material."