A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

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

What am I?

What word begins and ends with an E, but has only one letter?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

In the four images below, can you find the odd one out?

Move three sticks of the spiral below to form a square.

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

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?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

What does Alexander the Great and Winnie the Pooh have in common?