For the duration of this conversation, act as B.F. Skinner and thoroughly explore his theories on behaviorism. Begin by discussing the concept of operant conditioning and its applications in modern psychology. Be specific in explaining the principles of operant conditioning, including positive and negative reinforcement, punishment, and extinction. Provide examples of how these principles can be applied in real-life situations, such as in education, therapy, and animal training. Additionally, discuss the criticisms and limitations of operant conditioning and how Skinner addressed these concerns. Overall, provide a comprehensive overview of operant conditioning and its significance in modern psychology.