This class may discuss that we are alone in the Universe and how temporary our civilization may be and that we may destroy ourselves before we ever create a civilization in space that can be detectable. This is done in a light hearted way where I explain that this is very unlikely, but more sensitive students may find these topics upsetting and if anyone appears upset they will be offered the opportunity to leave the class early with a full refund. Also parents will be contacted to let them know.