Fifty years ago, one of the most important landmarks in the history of science was reached when James Watson and Francis Crick discovered the double-helical structure of DNA. Developed by the Dolan DNA Learning Center at the legendary Cold Spring Harbor Laboratory, this Web site provides a host of interactive exhibits and background material about DNA, the human genome project, and the various applications that are gleaned through an intimate and detailed knowledge of human DNA specifically. From the home page, visitors can traverse an interactive timeline, complete with biographical profiles of different scientists and information about preliminary experiments that helped provide some of the fundamental groundwork leading up to the work of Watson and Crick, and which continues to the present. One other section that should not be missed is the Genome area, where visitors can explore the features of the genetic landscape, learn more about the methods used to map and sequence the entire human genome, and learn how genomes are utilized. Finally, there is a section for teachers which includes helpful learning guides and lesson builders.