If eleven plus two equals one, what does nine plus five equal?

The more you take me, the more you leave me behind.
Who Am I?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

What is more useful when it is broken?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Do You See It?

What breaks yet never falls, and what falls yet never breaks?