Easy to understand! Learn the contents of science experiments in O2 through video. The page with the icon in the O2 textbook is immediately recognized by the camera and linked to the experimental video. Experience the vivid experimentation and exploration process that could not be conveyed through photos. From the experimental process to the explanation of the principle, you can learn easily and in a fun way with videos. [ How to recognize the camera ] ① Run the O2 Lab app. ② Find the textbook