Working in a lab you often get people describing you as a mad scientist. It’s hilarious every time and never ceases to be funny. But just too make sure that nobody thinks that scientists are really mad I have prepared a diagram that explains the true situation.
Basically there are a lot of people some of whom are mad. There are a lot of scientists, all of whom are people. Most mad people are not scientists, and most scientists are not mad.
I hope that clears up any confusion.