A World of Mystery

  What Comes Once in a 'Year', Twice in 'Every Month', Four times in 'Every Week', Six times in 'Every Weekend'?

    What is as big as you are and yet does not weigh anything?

    what word looks the same backwards and upside down?

   David’s parents have three sons: Sam, Cane, and what’s the name of the third son?

    What month of the year has 28 days?

What belongs to you, but everyone else uses it?

What can’t talk but will reply when spoken to?

  The more of this there is, the less you see. What is it?

Mary has four daughters, and each of her daughters has a brother. How many children does Mary have?

 What goes through cities and fields, but never moves?