I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What breaks yet never falls, and what falls yet never breaks?

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?

Move three sticks of the spiral below to form a square.