A bomb exploded in a room full of married couples and no one died. How?

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?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

Prove that twice of ten is the same as twice of eleven.

How can you drop a raw egg from a height onto a concrete floor without cracking it?

What has lots of eyes, but can’t see?

If two's company, and three's a crowd, then whats four and five ?

What can jump higher than a building?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?