Answer:
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
What can you put in a barrel to make it lighter?
I have one eye. See near and far. I hold the moments you treasure and the things that make you weep.
What is lengthened by being cut at both ends?
If you have it, you want to share it. If you share it, you don't have it.
What begins and has no end? What is the ending of all that begins?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?