History
1984: probability theory is
 unusable, because where would we get the numbers
 too computationally expensive
 unnecessary for AI.

1998: probability theory is everywhere
 MDPs an exciting direction in planning, robot control
 HMMs the core technology for speech recognition
 statistical approaches play key role in NLP
 Naďve Bayes wins KDD cup
 BNs in every Windows™ machine.