There are three reasons why this is one of my favourite Youtube videos. The first is that it is related to science and engineering. In my mind, there are twopeople in the world; those who like math and science, and those who like art, Englich, and Scocial Studies. I fall into the first catigory and this is the perfect type of video (and channel) to satisfy that liking. The second reason is the uslessnes of the item that is created. This may sound wierd, but I find if the video teaches you what to do in a practical, and unexiting way, then I may lose interest quickly. By creating something I’m sure you, and other people, who have played darts have thought of, it is a way to keep you interested to keep you watching to the end. Lastly, I like the fact that Mark Rober is having fun himself. It makes watching the video so much easier and, although other people may find a straightforward video more to their liking, I like the fact that you don’t need to know exactly what he is talking about to still enjoy the video.