Famous riddles

The Stanford Enigma

This problem was posed during a reflection test to students at the famous Stanford University.

Find out what the following sentences refer to:

1. It's better than God.
2. It's worse than the devil.
3. The poor...

The Stanford Enigma

This problem was posed during a reflection test to students at the famous Stanford University.

Find out what the following sentences refer to:

1. It's better than God.
2. It's worse than the devil.
3. The poor...

A water lily doubles its surface

A water lily doubles its size everyday. Thirty days later, it covers up the whole pond it is on.

How many days did it take for it to cover the quarter...

The bulb and the 3 switches

You are in a room with 3 switches. Only one of these switches can light the bulb in the next room. A door gives access to the next room, but...

The 2 guards and the 2 doors

Two guards each watch a door. One of these doors leads to Paradise, and the other leads to Hell. We know that one of the guardians is always lying, while...

The Stanford Enigma

This problem was posed during a reflection test to students at the famous Stanford University.

Find out what the following sentences refer to:

1. It's better than God.
2. It's worse than the devil.
3. The poor...

The dilemma of the farmer

A farmer has to cross a river with a wolf, a goat and a cabbage. For this, he has a boat but he can not leave together:

- The goat and...

The challenge of the emir

A dying emir and feeling life leaving him brings his two sons to him.

He said to them, "You see on the horizon the minaret of the neighboring town?" Well, the...