I honestly believe you can never tell if a relationship is going to last. In my own marriage which is going on 14 years I don't think of it as 'I'm going to be with this person forever.' Instead I think of more like 'I'll probably be with this person for the next six weeks. Then I'll re-evaluate.'
It is by doubting that we come to investigate and by investigating that we recognize the truth.
Science is fun. Science is curiosity. We all have natural curiosity. Science is a process of investigating. It's posing questions and coming up with a method. It's delving in.
Cops and robbers resemble each other so there's not a lot to learn in terms of learning the logistics of committing the crime or investigating the crime.