If electrical plugs had only one prong, nothing would happen. Electricity would not complete a circuit. Nothing would work.
Change either the plug or the cord. The fourth prong is another ground. It would be easier to change the cord.
This is something that should not be done. If this was to be done you would be omitting the ground which in point can make it unsafe. I recommend changing the female end of the system and making it a 4 prong.
No; the third prong is there to protect you from stray voltage and it grounds the wiring. Although you could probably find an adaptor, it would be much safer for you to have an electrician rewire the outlets so they can accept a three prong plug.
what would happen if a child had no stimuli in their household
That is one simple question that can't have any simple answers! For a start, do you mean "the history of electrical outlet changes" just for one country (such as USA or England, or Australia, or ...) or do you mean worldwide? One way for you to get some answers to this question would be to go to a science museum and ask if there is a section dealing with the history and development of electricity supply systems. Or you could go to your local library and ask one of the staff there to suggest some books for you to read that cover this subject!
If there were no bottle caps (as we currently know them), there would be covers or plugs of some type. For example: cork or wax or plastic plugs. Someone would invent something to protect the contents of a bottle.
This is very strange indeed. All modern houses in USA would have 3-prong outlets. I can't see how it could pass an electrical inspection. Check with the local agency who does inspections. Check your electric panel and look for an inspection sticker. I have encountered receptacles that are very hard to use because one or more of the pin slots (I don't know what else to call them) are way too tight. There is no easy remedy for this problem except to press hard to get the plug into the receptacle or replace the receptacle with one of a better quality. There are also child protective receptacles that require that two or three of the pins be pressed in at the same time or none of them will go. If the plug is just slightly off true it won't go.
Change either the plug or the cord. The fourth prong is another ground. It would be easier to change the cord.
a spearfisherman
This is something that should not be done. If this was to be done you would be omitting the ground which in point can make it unsafe. I recommend changing the female end of the system and making it a 4 prong.
Because there is no path for the electricity to return with only one prong. Electricity needs a complete path to flow through. If you were to grab a hot prong and the electrical source then that would work, but I don't recommend it.
it also carries curent from the outlet
Generally yes, but it depends on the building codes in your area. Homes that have not been updated may have the older two prong sockets. All newer homes will have the three prong or grounded sockets. Any new construction would require three pronged sockets.
the engine is constantly vibrating and it dislodges the spark plugs
I would recommend the OEM spark plugs, AC/Delco. Excellent plugs.
If a prong off a plastic fork broke and you swallowed it, it is unlikely that it could hurt you. Something so small would most likely pass through the bowel in the feces.
i would recommend ngk iridium plugs