Normal

'Normal' is a strange English word. Mathematically, it means 'forming a right angle'. Scientifically it means 'conforming to scientific laws'. Chemically, it defines the strength of a solution. Statistically it can mean a mode or an average. Biologically it describes an organism working without any defect. Now, all those definitions assume that something is absolutely right and true. However, socially, 'normal' means 'what is usual' - and that is assumed to be 'what is right' ...