of Epistemology III.- 1. The Chasm between S&T and the Humanities.- 2. Bridging the Chasm.- 3. Towards a Useful PS&T.- 4. Concluding Remarks.- 1. Formal Science: From Logic to Mathematics.- 1. Generalities.- 1.1 Two Main Types of Research Field.- 1.2 Some Peculiarities of Mathematics.- 2. Mathematics and Reality.- 2.1 Conceptual Existence.- 2.2 Mathematics and Reality.- 3. Logic.- 3.1 Logic Lato Sensu.- 3.2 Non-standard Logics.- 4. Pure and Applied Mathematics.- 4.1 Applications of Mathematics.- 4.2 An Example: Probability.- 5. Foundations and Philosophy.- 5.1 Foundations of Mathematics.- 5.2 Philosophies of Mathematics.- 6. Concluding Remarks.- 2. Physical Science: From Physics to Earth Science.- 1. Preliminaries.- 1.1 Physical Quantity, Convention, Measurement.- 1.2 Theory, Metatheory, Protophysics.- 2. Two Classics.- 2.1 Classical Mechanics.- 2.2 Statistical Mechanics.- 3. Two Relativities.- 3.1 Special Relativity.- 3.2 General Relativity.- 4. Quantons.- 4.1 Classons and Quantons.- 4.2 The State Function and its Referents.- 5. Chance.- 5.1 Probability.- 5.2 Double Slit and Double Logic.- 6. Realism and Classicism.- 6.1 Measurement and Projection.- 6.2 Hidden Variables, Separability, and Realism.- 7. Chemistry.- 7.1 Philosophy and Chemistry.- 7.2 Is Chemistry Reducible to Physics?.- 8. Megaphysics.- 8.1 Earth Sciences.- 8.2 Cosmology.- 9. Concluding Remarks.- Index of Names.- Index of Subjects.