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

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

What is the next number in the series?

15 29 56 108 208 ?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?