Quick answer: Food enters the human digestive system through the mouth before then moving through the pharynx, esophagus, stomach, intestines, rectum and anus.
I would assume because of where san francisco is i suppose that it just depends on where your located at
Im pretty sure they repel from the charged protons
Zero degrees latitude is the line designating the Equator and divides the Earth into two equal hemispheres (north and south).