“Traditionally, logicians have made a stark distinction between truthhood and falsity. A statement was considered to be either true (given a truth value of one) or false (a value of zero). In the 1960s, Lotfi Zadeh of the University of California at Berkeley came up with the catchy innovation of ‘fuzzy logic’. In this system, things could be sort-of true, or only partially false. A ‘truth value’ of 0.5 meant that a statement was half-true, and so forth.