For some definition of useless, I suppose. Without trying to be contrary, most of what I (we) know is 'useless' in terms of whether my knowing it has a "useful" impact on my life. Knowing that there's an equation governing gravitational attraction doesn't really impact my life experientially. It's true that if you're trying to design any system that involves a Carnot cycle, it becomes useful, but given no such job description, it's not 'useful' information. Much of science _is_ useful in our STEM-oriented world, to those using it.

I think some of the reality is that regardless of most other factors in our lives, love and relationships are a Big Deal, so stories in that realm have in some small way more usefulness. Thus, I know the plot of Romeo and Juliet better than I can give a summary of the Second Law.