The "why?" question

It started just recently. Wanda wants to now "why?" About basically everything she sees around her. Like yesterday when we went to a nice park on an island (Tervasaari). To get to the island you have to walk along the little marina - now full packed with boats. So she saw the people around those boats. "Why they are standing over there?" "Because they probably want to get to their boat." "Why?" "Maybe they want to have a ride, go to the see." "Why?" "The weather is so nice and they enjoy spending time on their boat". OK, she's watching them, than she sees a lady walking on a pier. "Why is she walking there?" She sees people lying on a lawn. "Why do they lie there?" She sees a dog's playground and there are some huge wooden dog statues. "Why there are those dogs?" And so forth. Sometimes it's fun to answer her questions, but sometimes I feel I get lost and I feel a lack of more explanations or just no more creativity in finding a quick and simple but still sufficient answer. Oh, and she found her old book "The very hungry caterpillar". She used to love this book, but we didn't read it for ages. So I started to read it to her. "In the night in the moonlight a little egg was lying on a leaf" (this is just my not accurate translation form my Polish version of the book, sorry for any errors). And my little daughter immediately asked: "Why?" "Why what honey?" "Why is was lying on that leaf?" "Hm, good question, I don't know actually, where the egg came from and how it got to that leaf, they don't tell us this fact in the book, but let's read what's next". The caterpillar is very hungry and eats constantly. On Monday he ate one apple, but he was still hungry. "Why?" "Because...." etc. etc. It was really funny to read the book now, cause I realized that this book is definitely for younger kids. My girl is already too smart to take such facts for granted :) And it's cool that we can now really discuss things. Another curious period just started!