Funny Riddles

When can we add 2 to 11 and get 1 as the correct answer?

When we see 2 but call 10?

How is the moon similar to a dollar?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

What has no start, end, or centre?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

By what process could you make a 'Tea-Table' into food?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)