What number when divided in half becomes zero?

What English word has three consecutive double letters?

Name a key which is hardest to turn.

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

It is always ahead of me yet I can never see it. What is it?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

If a wheel has 54 spokes, how many spaces are there between the spokes?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?