Inquiry is naturally the way humans learn. As babies, we look at the world, make predictions, try things, try again, try again, and make sense of what happens. This is how we develop theories on how the world works and these theories are constantly evolving.
When an 8 month old throws their spoon off the highchair they are looking to see what will happen. Does it drop to ground? Yes. Will it drop to the ground if I try again? Yes. Oh look, Dad picks it up. Will he pick the spoon up again if I drop it?
Sometimes your child's actions might not make no sense to you, but they may be testing their own theory. They are learning by doing. That is why you will see children at Northbridge discussing, building and making.