Are there chemicals in the air that pass through the blood brain barrier that affect neurotransmitter receptors.?

Glad you asked that. Yes, it's REAL AND true. Evolution is a fact.

The fossil record is a fact and documents how life on earth evolved over 3.5 billion years ago to recent times with the appearance of more and more complex groups, and the extinction of others. Couple with that the fact that the earth is 4.54 billion years old, and life has been documented from 3.5 billion years ago, it provides the necessary background for slow evolution over immense time. The distribution of species in the world also shows the impacts of evolutionary processes such as the fact that most marsupial mammal species evolved in Australia, and that higher taxa are not distributed randomly across the world.

And the platypus is a fact, as unusual as it is. Your DNA is a fact both in your chromosomes and your mitochondria and it can be used to show the migration of humans out of Africa over 60,000 years ago. Your DNA also shows, compared to other species, that we have a common ancestor with other primates.

I could go on, and discuss the tens of thousands of scientific papers, field and lab studies, and the fact that not one piece of information or evidence has falsified the theory of evolution (the explanation of the evidence above) over the last 150 years and more. Thus it's not really necessary to answer the rest of your question because, since you didn't know evolution was true, you probably have a number of crazy ideas about the subject based on lack of knowledge. You don't have to thank me for this information.

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.