Answer:
What is the difference between yesterday and tomorrow?
What goes up and never comes down?
When is homework not homework?
Feed me anything and I will live.. But feed me with water and I will die...
How do you drop an egg and never break it?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.