Find the hidden tiger in the given optical illusion ?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

What is both possible and impossible at the same time?

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?

What is black when you buy it, red when you use it, and gray when you throw it away?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Can you find out which number multiplied by itself will give the output as 12345678987654321?