The device that the protagonist created to detect ghosts could have a unique combination of technology and spirituality that sets it apart from other similar gadgets. For example, it could use advanced sensors to pick up paranormal activity combined with a spiritual component, such as a crystal or other powerful energy source. This combination would allow it to detect ghosts that were previously undetectable. Alternatively, the device could use a new breakthrough in quantum physics or neuroscience that enables it to detect the presence of ghosts. The key here is that the device is unique and sets itself apart from other attempts at similar gadgets, making it a plausible explanation for why ghosts have become visible for the first time in modern times.
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