Speakable and unspeakable after John Bell

摘要

`Philosophy' was speakable for John Bell but is not for many physicists. Theborder between philosophy and physics is here illustrated through Brownianmotion and Bell experiments. `Measurement', however, was unspeakable for Bell.His insistence that the physics of quantum measurement should not be confinedto the laboratory and that physics is concerned with the big world outsideleads us to examples from zoology, meteorology and cosmology.