I am the shortest complete sentence in the English language.What am I?

If a fire hydrant has H2O inside what does it have on the outside?

A skin have I, more eyes than one. I can be very nice when I am done. What am I?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth I am dissolved into air. What am I?

It is everything to someone, and nothing to everyone else. What is it?

Before Mount Everest was discovered, what was the highest mountain on Earth?

If a brick weighs 7 pounds and half a brick, how much does one and a half brick weigh?

When liquid splashes me, none seeps through. When I am moved alot, liquid I spew. When I am hit, color I change. And color, I come in quite a range. What I cover is very complex, and I am very easy to flex. What am I?

I live above a star, but do not burn. I have 11 friends that do not turn. My initials are PRS. What am I?