There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Can you tell a 3D object that has just two surfaces?

How can you make a TV, a bed, a dog, and a car liquid?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

I look at you, you look at me I raise my right, you raise your left. What am I?

How could a baby fall out of a twenty-story building onto the ground and live?

Replace the question mark with the number below given a simple math problem.

Which part of London exists in France as well ?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?