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

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

How is a fly different from a mosquito?

A sundial has the fewest moving parts of any timepiece. Which has the most?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

What am I?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?