I'm subscribed to this Youtube channel called Gross Science, and today their new video is about snot. As someone who's very aware of air bounce contaminants, it was facinating to learn about how much snot protects our bodies from them. There is a nasty draw back to it all though. Even when someone is healthy, they produce about a half a cup of snot everyday which they swallow (albeit unknowingly). Ew, gross.