This informal talk is about some conceptual basis of Majorana modes in superconductors. In BCS mean field theory which assumes a constant superconducting phase, a Majorana mode is a zero-energy bound state solution of Bogoliubov-de Gennes Hamiltonian, which corresponds to a real (Majorana) operator. We show that Majorana modes can be defined directly from a measurable quantityone electron Greens functionwithout recourse to BCS mean field theory. This definition gives a simple and unified understanding of many physical properties of Majorana modes. Our definition sets up a formalism to study Majorana modes in mescoscopic superconductors with a finite charging (Coulomb) energy favoring a constant number of electrons rather than a constant phase. By taking charging energy into account, the internal state of two spatially separated Majorana modes can be directly measured in a nonlocal tunneling experiment which probes the electron Greens function. This striking nonlocal teleportation phenomena demonstrates electrons charge-statistics separation caused by the interplay between Majorana modes and the superconducting phase.