What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Count the number of triangles in the below picture?

What is at the end of a rainbow?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?