Count the squares in the matchstick puzzle below?

How can a man go eight days without sleep?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

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?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

You need to move three matchsticks to form three squares. Can you do it?

There is something which is always coming but never arrives?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?