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 a five letter word that is left with only two letters if one is removed?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

What is more useful when it is broken?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What has 88 keys?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

How many times in a given day, minutes and hour clock comes in a straight line ?