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Apologies for the delay in getting back here.
I haven’t time to watch the video on your link at the moment, Ankou, but I will. Thanks.
'Fuzzy' brain activity is no doubt responsible for many reported sightings of 'ghosts', but that wouldn't explain why, on occasions, more than one person sees the same thing at the same time, as Sara and her friend did; it wouldn’t explain the odd things that happen that don’t involve ‘ghostly’ sightings - for example, things going missing for months and suddenly reappearing in a prominent place - and nor would it explain why a person apparently suffers‘fuzzy’ brain activity in one house, but nowhere else.
I think Sherlock Holmes was absolutely right when he said ‘When you have eliminated the impossible, whatever remains, however improbable, must be the truth.’