Kasper Mortensen Posted about 2 months ago Elizabeth Pisani: Sex, drugs and HIV -- let's get rational This is explained by the same science that reasons about why all humans have the same number of limbs; genetics. According to science your brain is a processor, and its characteristics are defined by the blue-print in your DNA. Any deviations are due to a scientific lack of understanding of the exact functions of individual DNA strings, or simply mutation. This means that your brain is supposed to behave like any other human brain, so when it does, that is actually just confirmation of what we already know. It's pretty neat, though. EDIT: Science encourages the use of such words as "conscience" or "soul", but the current state of science suggests that these things exists within the boundaries of what your brain can process, and so is limited to you as an individual.