This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

What word begins and ends with an E, but has only one letter?

Can you count the number of squares in the figure below?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Can anyone tell me a word in the English dictionary which has a silent 'z'?