Is dust mostly dead skin?

From the video, I learned that dust is mostly dead skin because of evidence that scientists performed. Examining dust can show others what characteristics a person might have. I think this is really cool because by examining dust, people can tell who has been in the room. I like how in the video, he supports his claim that dust is mostly dead skin by telling the audience about different experiments. I am also very impressed with how much dead skin humans shed over days, months, and years.