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

What 5-letter word typed in all capital letters can be read the same upside down?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What's a single-digit number with no value?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

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

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?