Yes, we do interest led science, for example. My big girl is very interested in Chemistry and after a brief unit about Astronomy, we are going to head back to Chemistry. (Though Chemistry doesn't have much to do with being a duck! :lol: )
But when the girls express interest in something, I do seek out opportunities/resources/materials for them to explore the interest more. If it is something that sticks, the more involved I get with finding more materials/resources/opportunities. Sometimes things are just a passing phase too.