Answer:
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
Sometimes black, sometimes white, I have veins but no blood
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What is weightless but it needs two person to hold it?
What scientists might call your pooch.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?