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

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

The answer I give is yes, but what I mean is no. What was the question?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

What is the next number in this matchsticks series riddle?

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

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

Find out the missing number in the picture attached:

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?