A ceiling fan is a mechanical fan, usually electrically powered, suspended from the ceiling of a room, that uses hub-mounted rotating paddles to circulate air.
Escherichia coli (E. coli) bacteria normally live in the intestines of people and animals. Most E. coli are harmless and actually are an important part of a healthy human intestinal tract. However, some E. coli are pathogenic, meaning they can cause illness, either diarrhea or illness outside of the intestinal tract.
Scientists estimate that there are more bacterial cells in your gastrointestinal tract than the entire number of cells in the rest of your body. There are two types of bacteria in our intestinal tracts: there is beneficial bacteria and pathogenic or harmful bacteria.