Memristors were mathematically found by L. O. Chua in 1971 and experimentally demonstrated by HP researchers in 2008 [1], [2]. Since then, memristors have been considered suitable for neuromorphic circuits and systems, because they have some similarities with brain's neuronal systems [3], [4], [5]. Memristors are possibly 3-dimensioanl, parallel, analog, defective, etc like brain's neuronal systems [6], [7]. In spite of these similarities, memristors are fundamentally electronic devices, not biological cells. The difference of electronic devices versus biological cells leads to very distinctive phenomenal gaps which can be stated as follows; externally-designed versus self-organized, externally-programmed versus self-learned, defect-susceptible versus defect-curable, etc.