What does does this rebus picture means ?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What Does this text mean:

important=important

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?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

People put me on the table and cut me but do not eat me. What am I?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

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