I like to mess with the physical quantities Since i got interested in phiolosophy, I always wondered What phenomenon will we get if the following physical quantities are negative? Mass Electric potential Temperature Electric charge Amount Luminosity Time Electrical resistance Refractive index Pressure Thermal conductivity Weight Volume/Length, Area etc. Specific heat capacity particle spin In addition, a phiolosophical question Why are every entities (concepts, matter etc.) must have two sides (i.e. -+ or good evil) Is it possible to have any entity that is mono sided, if so what happens?