Its a first draft. Thanks for giving me ideas. Some of them disturbing.
I believe this is the reason I have been a skeptic of visits from other worlds that look like so much like us. Actually these visitors drawn from memory kind of look like a human fetus at some point of their development.
My theory is if in fact we are being visited it is by observers from OUR future.
Since this is science fiction we can allow our imagination to ignore the reality's of our knowledge to this point in time. If the storeys people tell are a fact, then where do these things come from, not our past unless ----there are ways to get around that----not the present, but the future perhaps.?
Fancy this FGL, if we could today build a [ way back machine ] and head back in time to say 2,000 BC and and check out society in China, what precautions would we take.?
We would need protective clothing for one thing, we would have no immunity to long dead viruses, the very air would be too rich in oxygen or the reverse too full of the poisons that come from erupting volcano, the very garbage they abandoned would be crawling with microbes that would be dangerous to us.
We would need to wear hazmat suits with an air supply that our body's have been use to. The humans of that time adapted to the conditions they lived under, we wandering about without protection could not survive for long.
First thing we would need is a humane body to study, capture one and study their bowels and all internal organs. What did they eat, what were the diseases of that day, etc.
Then the suits would protect the humans we came in contact with from OUR germs and diseases that could wipe them out.
Lots of fun thinking about the past and the future, would we perhaps butcher their farm animals to study the progression of evolution, natural or man made breeding.?
Brings to mind the farmers in the south west that reported finding some of our cattle disemboweled as if by laser 15 years ago.
You asked for ideas about science fiction, just look around you, all these mysteries here on planet Earth have a logical explanation for their time-------we just need to find an explanation that those in science have not found yet.