nemfrogfilms Follow "Veins from tissues to heart." Circulation of blood. 1926.Internet Archive#animation#gif#body#physiology#anatomy#circulation#educational films#silent movie#nemfrog#1920s#1926
nemfrogfilms Follow Dirty hand. Sniffles and Sneezes. 1955.Internet Archive#gif#dirty hands#hand#educational films#out out damned spot#nemfrog films#1955#1950s#coronavirus
