20:32CrowdScienceWhat is dust?BBC World Service Duration: 30 minutes Fri 15th Dec 2017, 20:32 on BBC World Service Americas and the CaribbeanAvailable for over a yearListen nowMost people think it’s just dead skin. But what’s really hiding in your dust? Show more GenresFactualScience & NatureFormatsDiscussion & TalkBrandCrowdScience Source: BBC Online