Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?