This site from the National Museum of American History examines the famous sequences of photographs taken by the photographer Eadweard Muybridge to explore the dynamics of human and animal locomotion. (It was Muybridge's photographs, spaced only split seconds apart, that first proved that at one point in a horse's gallop all four legs are off the ground at once.) The site features a number of Muybridge's sequences of men and women as well as animals engaged in physical activity, often scantily clad or in the nude to capture the physical dynamics of the movements. (In the case of men, this activity is often athletics; in the case of women, the photographed motions are often more socially circumscribed -- the moving of a fan, for instance.) The site allows viewers to examine these sequences in miniature and full-screen sizes as well as to watch continuous animations made from the series of still frames, thus realizing Muybridge's anticipation of motion pictures. Accompanying commentary explores the technique of Muybridge's work as well as its scientific and social implications. For another recent site on Muybridge, see the December 12, 2000 Scout Report.