Why?

My new favourite word now is "why?". I am wondering why things are so these days, and am asking Daddy constantly. I like challenging Daddy to answer my questions "why?". Here are some examples:
I asked Daddy why there was only one curtain on the kitchen window but two curtains on the other windows.
Daddy: "because the kitchen curtain is long enough to cover the whole window"
Me: "why?"
Daddy: "because that curtain is long"
Me: "why?"
Daddy: "thats how it was made"
Me: "why?"

Daddy didn't answer.

I found a different blanket on my bed, so I asked Daddy:
Me: "whats this?"
Daddy: "its a big blanket. Mummy put it on your bed because it was cold last night."
Me: "why?"
Daddy: "because it was cold."
Me: "why?"
Daddy: "because its winter now, so its cold"
Me: "why?"
Daddy: "because we are on part of the Earth that is further from the Sun at the moment"
Me: "why?"
Daddy: "because as the Earth goes around the Sun, it also wobbles on its north-south axis, and at the moment the top half is tilted towards the Sun and the lower half, where we are, is tilted away from it"
Me: "why?"
Daddy: " ... because it just is"
Me: "why?"

Daddy didn't answer me again. So frustrating!