When they ask a question, instead of giving them an answer, we just ask what they think first. Often that leads to a rather wild/creative prediction, something that comes out of their understanding of thew world, which although limited, is beautiful. We explore forward from there.
Generally, it helps to put kids in charge of their own life in whichever capacity they can at this point in time. If they know they can put on their own shoes, clean their own dishes, make their own breakfast ...etc, they also learn implicitly that they have full ownership of their thinking too.
To be honest, it's hard because very often it's easier for us, the parents, to just have the kids do what we need them to do, rather than what kids want to do, or think is the best way to do it. But, it's a tradeoff. When they get more freedom, they engulf in it.
My 2c.