Landau - Brain Teasers

Number of cubic units needed to fill space is called the

The distance across a circle through its middle is called the

What can you break without touching it?

Three  ladies stood under an umbrella but none of them got wet. Why didn't they get wet? 

The set of all points in a plane that are the same distance from the middle is called a

What do you have to give before you can keep it?

You have a match. Which do you light first, the newspaper, the lamp, the candle, or the fire?

The distance around a circle is called the

The more you take, the more you leave behind. What are they?

What is so fragile that when you say its name, you break it? 

What goes up, but never goes down?

 When I was born I was big but the older I get the smaller I am. What am I?

What's always coming but yet never arrives?

What ends in W but has no end?