Poems riddles

I am a white box having no key or any lid. Yet there is a golden treasure inside it. What Am I ?

Some people prefer them with raisins Some like them to contain chocolate chips Whichever kind of these you like though They don't last long once they've passed your lips What are they?

I am a home of knowledge, both banal and profound. In grand halls and small homes I can be found. I am a home for things of many leaves, but my many residents are not living trees. What am I?

Thirty white horses on a red hill. First they champ, Then they stamp, Then they stand still. Who are they?

When you have me, you feel like sharing me. But, if you do share me, you don't have me. What am i?

I am seen in the water if seen in the sky, I am in the rainbow, A jay's feather, And lapis lazuli.

Slayer of regrets, old and new, sought by many, found by few. What am I?

A man while looking at a photograph said, "Brothers and sisters have I none. That man's father is my father's son." Who was the person in the photograph?

Turn me on my side and I am everything. Cut me in half and I am nothing. What am I?