A desire to explore stuffs that matter.
I don't think it's the "stuff" that matters. I think it's curiosity itself... that desire to understand, to know more, to be able to play with something just because it's 'interesting.'
What I mean in that is, "stuffs" are where you begin your life. Curiosity, I would say just brings you to places but leave things behind if it gives no use in life.
For example ??
What will give you direction in no useless place.