The Soybean Car was actually a plastic-bodied car unveiled by Henry Ford on August 13, 1941 at Dearborn Days, an annual community festival. The frame, made of tubular steel, had 14 plastic panels attached to it. The car weighed 2000 lbs., 1000 lbs. lighter than a steel car.
The second brain contains some 100 million neurons, more than in either the spinal cord or the peripheral nervous system, Gershon says. This multitude of neurons in the enteric nervous system enables us to feel the inner world of our gut and its contents.
There is no question as to where to draw that line. Counting only somatic cells when asking how many body cells they are (body = soma) is not dissing the gut flora or the other bacteria associated with the human body. Regarding your source, it is interesting that they happen to say 100 trillion cells.