No, Kit-Kats do not contain peanut butter, or any other form of nuts.
You toast the peanuts in an oven and then grind them until they are smooth and form peanut butter. Some people add a little salt and sugar.
Peanut butter is made by simply grinding up 'peanuts'. Peanuts are the fruit (a pea) of the peanut plant which occur in a pod on the end of a long shoot which pushes itself underground for the peanut to develop (hence groundnut which is another name for a peanut).
No, peanuts is a plural noun. The singular form may be used with nouns as an adjunct (peanut butter, peanut vendor, peanut farm).
Edible matter.
No. Peanut butter has no poisons in it unless it was the one that was recalled recently. The one recalled came from a peanut place in Georgia, USA because that recalled peanut butter was recalled because of Salmonella. Another possible problem with improperly processed peanut butter could be mycotoxins. If the peanuts aren't grown and handled properly, mold could grow on the peanuts and form mycotoxins. Some mycotoxins are known to cause cancer.
Peanut butter
No, the ancient Incas were the first recorded users of peanuts in a paste form. In the US, George Washington Carver was the first to make peanut butter in a form we recognize in 1880, and didn't get a patent on it because he believed good foods were a gift from God. Others produced and marketed peanut butter after him, including Kellog.
Peanut butter is almost a "no brainer"- in simple form all it is , is pureed peanuts. If Carver invented it, it must not have taken him very long. More likely he saw its value as a food and promoted it as a good way to enjoy peanuts.
Peanuts have so much natural oils that when they are crushed and ground they don't become floury, they form a paste and become peanut butter.
Pajamas? Peanut butter and jelly? You should probably make your question more clear.
1861, in an early form of telephone earpiece.