Science explains a lot about the human mind and empirical evidence has shown that it is very easy to trick the brain into false perceptions. It is also normal for us to create and modify memories. So science does not have to explain floating bodies unless there is some incotrovertible evidence that they exist (observation under controlled conditions). Until there is proof of floating bodies, psychological explanations are more than adequate.
There are so many video cameras in this world it's a wonder that nothing extraordinary like this has been captured. To hear some people talk, these things must be extremely common!
When I was a kid, my brother and I saw little demon shadows in my room. They seemed real at the time, but of course I now know that we were creating the perception with our suggestible state and superstitious beliefs. Interstingly as soon as I stopped believing, the experiences stopped. Don't you find that intriguing?
The point is that you can't really say much about "science" when you haven't taken the time to do the research. Pet theories about ghosts and gobblins are nothing but uneducated guesses that keep people from understanding the real nature of the phenomena.
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