This is probably a common fear, but...terrorist attacks (idk if school shootings are considered terrorist attacks but I'm including them too). I'm in college, and it's something I think about relatively often. When I'm in class, I sometimes find myself thinking about where the exits are in the room and building that I'm in, and where some good hiding places might be if I ever need them. When I'm in a school building (or even my own apartment sometimes) and the fire alarm goes off, I'm hesitant to get up and join the pack of people heading for the exit because I know that these days, someone my age/demographic is more likely to die in a shooting/terrorist attack than in a fire, and if it is an attack then I don't want to be congregating out in the open. I also tend to get suspicious of people walking around campus more than I should. Like if I see a white guy in a long, heavy coat carrying a weird briefcase-type thing, I'll notice immediately and panic internally for a few seconds before I realize that he's walking into the music building, so what he's carrying is probably an instrument case, and then I"ll think "It IS 50 degrees outside, so I guess the coat makes sense." Maybe all of that is normal. Maybe those are regular safety precautions I should be taking. Feel free to let me know your thoughts. But personally, I don't think that's something most 20 year olds should have to think about regularly. Obviously, I don't know if it will happen at my school, but I know it will happen somewhere, and it could be here.