There are many reasons, but the video The inner life of the cell made by Harvard biologists and animators is one of them. I think it shows the beauty of what is going on in every in your body with every breath and with every heartbeat. In my day-to-day work I try to be emotionally detached and rational about science. I have to be. But every time I feel overwhelmed by homeworks, papers, tests, or lab work I watch the video again to remind myself why I love science so much and remotivate myself to push through another challenge.
Cool isn’t it? Here is the video with explanations of what is going on: