What occurs twice in a week, once in a year but never in a day?

How can a man go eight days without sleep?

What number when divided in half becomes zero?

There is something which you can be arrested for attempting but not for successfully completing.

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Can you count the number of blocks in the picture below?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?