The human body is approximately 99% comprised of just six elements. (Oxygen, hydrogen, nitrogen, carbon, calcium, and phosphorus) Another five elements make up about 0.85% of the remaining mass: sulfur, potassium, sodium, chlorine, and magnesium. Every atom is 99.999999% empty space (including your brain atoms). A molecule is a group of two or more atoms that are bonded together. Therefore, everyone's brain is 99.99999% empty space. In essence, a vacuum. Psychiatry/psychology is the analysis of a vacuum. Also keep in mind that we are 98.7% chimpanzee by DNA comparison. It's currently generally accepted that chimpanzees (Pan troglodytes) and their close relatives the bonobos (Pan paniscus) are both humans closest-living relatives, with each species sharing around 98.7% of our DNA. Translated to english, we are 98.7% chimps. We are made of meat!