What occurs twice in a week, once in a year but never in a day?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

You can hear me, but you can't touch or see me.

What am I?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why 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?

Who always enjoys poor health?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

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