by SweetPea (Posted Wed Feb 26, 2014 8:12 pm)
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Can ideas be considered real? Can ideas be said to exist?Cygnus_X1 wrote:Things have to interact via one of the four basic forces of nature in order to exist. Some particles, such as neutrinos and dark matter, have quite weak interactions. In the case of dark matter, the only interaction with the rest of the universe is via gravitation. A particle type that did not even interact gravitationally would to all extents and purposes NOT EXIST.
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