Not only does the belief in ghosts pose practical scientific problems (how do you detect something which violates all the known laws of physics, and which refuses to appear to anyone but the naive?), it also raises logical problems:If ghosts can be seen, then they must be interacting with the physical world and somehow send or reflect photons towards our eyes, and if they can be heard, then they must also be interacting with the world and emit sound waves that our ears can detect, and if they can be felt, then they must be interacting with our physical body and be detected by the nerve endings on our skin, and so on, but then, by any of these suppositions, they shouldn't be able to walk through walls... or, if they could, then they couldn't consistently interact with matter and move objects, or touch us and be felt, even in our no-no places :)
Believers might suggest that ghosts might be composed of neutrinos, which are notoriously -and dare I say, conveniently- difficult to detect, but like with the problems above, when you cover one hole in a holey belief, or is it holy? :), another hole reappears somewhere else...
Click here to learn about the philosophical problems with the idea of souls.
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