Is there a ghost in the world? Is there a four-dimensional space? The expert answered.

There are ghosts in the world. Only the scientific community has adopted an evasive attitude towards this reality; Because of its nature and research difficulty, it is recognized as superstition. But many facts can prove that ghosts do exist in the world, such as: the disc fairy (a divination game), haunted houses, some bizarre accidents and so on.

Four-dimensional space is a kind of inference space, which is above three-dimensional space. At present, only one-dimensional, two-dimensional and three-dimensional spaces are recognized by human beings, and the nature of four-dimensional space is inferred from the spatial nature of the first three dimensions; As for what the four-dimensional space is, no one dares to answer this question, because our existing three-dimensional space is one dimension less than the four-dimensional space, so we can't even imagine what the four-dimensional space looks like; It's like if there are people living in two-dimensional space, they can't imagine what three-dimensional space looks like anyway.