The most common answer is temperature. If the oil is not hot enough, it will be absorbed into the product. If oil is hot enough, it will very quickly give a crispy coating on the food.
There are some foods that will actually add oil to the vat instead of taking away, such as bacon or sausage.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.