Look at the picture and find out which square is not linked with any of the other squares.

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

How can a man go eight days without sleep?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Which is faster, Heat or Cold ? Explain.

Take one out and scratch my head, I am now black but once was red. What am I?

I can be cracked, made, told, and played. What am I?

How many letters are in the alphabet?

There are forty elephants and they have forty-fore heads. How can this be possible?