Answer:
I'm full of holes, yet I'm full of water.
You can only have it once you have given it.
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
It's been around for millions of years, but is never more than a month old. What is it?
Ten men's strength, ten men's length. Ten men can't break it, yet a young boy walks off with it.
I am the kind of an ant that's good at math. What am I?