Do we really understand quantum mechanics?

1. Historical perspective

2. Present situation, remaining conceptual difficulties

3. The theorem of Einstein, Podolsky and Rosen

4. Bell theorem

5. More theorems

6. Quantum entanglement

7. Applications of quantum entanglement

8. Quantum measurement

9. Experiments, quantum reduction seen in real time

10. Various interpretations

11 Annex : basic mathematical tools of quantum mechanics.