The crackpot index is a number that rates scientific claims or the individuals that make them, in conjunction with a method for computing that number. The method, proposed (most likely as a joke) by mathematical physicist John Baez in 1992, computes an index by responses to a list of 37 questions, each positive response contributing a point value ranging from 1 to 50. The computation is initialized with a value of −5.
Presumably any positive value of the index indicates crankiness.
Though the index was not proposed as a serious method, it nevertheless has become popular in discussions of whether a claim or an individual is cranky, particularly in physics. [citation needed]
The index contains the following line which could be considered a joke at the expense of string theorists.
50 points for claiming you have a revolutionary theory but giving no concrete testable predictions.