Suppose you’re an epidemiologist who recently came into possession of a time-machine. Following an outbreak of a mysterious disease in a small community of individuals, your job is to go back in time to do everything you can in order to curb the spread of the disease. The only information of the system you have is the (i) contact network of the community and (ii) the index case of the mysterious new disease. Your only allowed intervention is the quarantine of a single individual in the population. Of course, you could try to convince the people in the community that you are a time traveling epidemiologist, but they would very quickly dismiss you as a crackpot. Furthermore, you are not allowed to remove the index case, as clever as that may seem.