Fuzzy Logic
   - Fuzzy logic seems really popular.
 
   - It's often used for controllers, but I think in general
       it's used because it's simple (but ill-founded).
 
   - Instead of a variable having a probability, it has
       a range of values.
 
   - Variables can be combined in different ways, and the
       maths are not consistent.
 
   - However an example is: A and B -> min(val(A),val(B))
 
   - It can be nice for fuzzy values like hot or tall, or
       for a nice hack.
 
   - Dempster Shafer theory tries to support this.
 
   - This fits in with some mathematical theories of fuzziness.