While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

The centre of the third figure is empty. What digit should fit inside?

What has a bottom at the top?

A father's child, a mother's child, yet no one's son.

Who am I?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Forwards I am heavy, backward I am not. What am I?

What kind of tree can you carry in your hand?

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?