JoVE (Journal of Visualized Experiments) Science Education Database is the very first video gernal in the world. This database is for biology, medical science, chemistry, and physics.
These video demonstrations help to understand such as the basic methods and the laboratory techniques.
These kinds of videos can be watched.
・General Laboratory Techniques
・Basic Methods in Cellular and Molecular Biology
・Essentials of Biology 1: yeast, Drosophila and C. elegans