Put two metal sheets very close together in vacuum, we'll find they attract each other with a small but measurable force. The explanation for the Casimir effect is that empty space is cracking with zero-point energy(ZPE), a phenomenon arising from quantum theory, and this energy pushes the metal plates together. All scientists agree that such a force does exist, but the trouble is physicists can't agree on what it means for something to be true. Is empty space really fizzing with energy? Perhaps the answer may determine the fate of the universe. A variety of anomalous phenomena in nature or at laboratories could be explained by the Casimir effect and the torsion field theory.