Problem
Reflect on how scientists have to decide when they should trust their theories. For decades, many physicists simply did not take ideas about the early universe or black holes seriously. One question they had to face is whether an interesting feature, such as a singularity, only appears in an over-simplified model, or whether it will still be present even in a more realistic case. So what are some of the ways scientists have answered this question, in the topics we discussed this week? Now what does this imply about how we should think about science in other cases?