Just that. My 4 yo asks loads of 'why' questions, all the time. And I really don't mind answering, it's just that a lot of them are: why is this (random) buy wearing a blue hat..why is this girl not peddling on her bike, why did she turn left now...why has this girl got brown eyes...why this person has a green coat..I find it really wearing after a while, I try to divert her to a different conversation but it comes back to this. I guess it's typical for this age?