Well, for me, the level of anxiety is definitely different. I somehow have a few degrees of fear towards machines that could emit harmful level of ionizing rad

Well, for me, the level of anxiety is definitely different. I somehow have a few degrees of fear towards machines that could emit harmful level of ionizing radiation, and I can be nervous if the machine is operating on me (say doing X-Ray at the dentist). Plus, I also have some anxiety when handling concurrent programming, which according to the Wikipedia is what caused the error in Therac-25. So I guess I got double anxieties on that story.