Getting to the Bottom of a Crime

We're looking at get to the bottom of something. And this is about discovering the truth, isn't it? Yes, that's right. If we get to thebottom of something, we find out the cause of a particular situation. So in the headline, the mystery illness is the thing that people don't understand,. But scientists have been investigating. They're trying to get to theBottom of it. Is this expression only for serious things? Well, not always serious problems, but certainly negative situ s.