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.
Nutrition. Bacteria are generally classified as either helpful or harmful. Bacteria can be found everywhere, and appear on every surface and every part of the human body. The helpful bacteria are those commonly found in yogurt and in the making of cheeses, and are good for the intestinal tract.acteria are generally classified as either helpful or harmful. Bacteria can be found everywhere, and appear on every surface and every part of the human body.