Obs. Theory(cs) 1)Core+ Cones (2) Different components come from different locations (3) Pulse profile shapes changing with freq (4)Mode changing (5) Bi-drifting Pulsars: NS or Strange stars?Obs. & Theory(ICS) (1) Core + Cones (2) Different components come from different locations (3) Pulse profile shapes changing with freq. (4) Mode changing (5) Bi-drifting  Pulsars: NS or Strange stars?