PHILOSOPHY: enlightening about some metaphysical problems and concepts.

Dear pupils in our Philosophy course. I've got some remarks to make about key points in our Unit 4:

1. Unfortunately, you haven't sent any questions about the last sections, with the lucky exception of Jesús Petrer. Should I conclude your comprehension has been perfect? Let me experience serious doubts about that. 
2. To reinforce your understanding of a couple of difficult concepts in the middle of the unit, I'd like to recommend you to watch these videos:
1. Zeno and his Paradoxes.
2. Is Time Real?
3. What is Impossibility?
4. What do "Necessary and Contingent" Mean?
5. Are Possible Worlds Real?-Modal Realism.
   
3. After having studied section 3 in our booklet, you have to do the exercise 11, page 10. Just send me the missing words or names via email. Deadline: this coming Monday 23, 14:00 h.
4. We are meeting via videoconference one of these days to discuss and clarify many aspects of the Unit. Please, let me know your free hours. Further details will be sent via email.
5. When studying the sections involved, or watching the clips or solving the exercises, please don't hesitate to add comments or questions below this (or any other) post to increase your grades.